Main bearing sleeves come in two half-moon sections, one that sits inside the main bearing cap and one that sits in the engine block. One of the most important factors when it comes to the health and durability of your rotating assembly and the block itself is the amount of open space between the main and rod journals on your crankshaft and the bearing shells they are spinning within, Problems can enter the picture pretty quickly when the bearing clearances aren't correct, By clicking Sign Up, you agree to the  Terms of Use. This means the bearing shell is thinner, which creates 0.001 more clearance than a standard bearing. Newer factory bearings (2010.5 and later) are made from tin-aluminum, not lead-copper. Because of this reduced flow, the localized bearing temperature will increase. This looks like a horseshoe with a round handle attached to one leg. Pair a STD half bearing with either a .001 or STDX half bearing to obtain your clearance. The way I was taught to do these when a young boy by my father and grandfather was: I agree with some of the others on running it for a few hundred miles first. They are adjusted by either increasing or decreasing the lengths of the inner and outer cables in relation to each other. Most rod and main bearings run best with .0007˝ to .001˝ of clearance for every inch of crankshaft journal diameter, or .0015˝ to .002˝ inches of oil clearance for a 2-inch diameter shaft – but these numbers will vary with the oil viscosity and application. Rod Bearings . Learned never to take a vintage engine to a local machine shop if it was to be done correctly. I never open rod or main housings or sand the back of main or rod bearings. Reducing the clearance will increase the restriction to flow and reduce the volume of oil past the bearing. For best rolling-element bearing life and machine reliability, internal clearance at running conditions must be close to zero. Tighter oil clearances produce less peak loading on the bearings and the engine runs smoother with less vibration. Looking through the service manual it says to use plastigage (which I'll be picking up tonight) to place between the crank and the bearings. When everything in the engine is right, the oil keeps the steel of the crank journals and the babbit of the bearings separated, and they never touch. Pay particular attention to any special symbol footnotes listed, which call out alternate materials available and the availability “They’re at the end of the oiling system, the last things to get oil, so they’re just not as important. The … To do this you mix half the shell of a one-over or one-under bearing with half the shell from the standard bearing. Adjusted the rods to the correct clearance like they should have been done the first time and that stopped the rod knock. "Then if you want to go loose, add .0005," suggests Lake Speed, Jr., certified lubrication specialist at Driven Racing Oil. Notice: Any comments posted herein do not necessarily reflect the official position of the VCCA. Manufacturer: Glyco. The crankshaft journal spins within the two. This is typically indicated by nearly full parting line to parting line shaft contact with bearings having less eccentricity. An oversized bearing is the opposite. Just do not make them too tight. One one-thousandth of an inch is a big jump, but you can actually make adjustments in 0.0005 increments—that's one-half of one thousandths of an inch. Use P series mains where higher eccentricity is desired to narrow bearing contact … It is accepted practice, for example, to mix one 0.010-under shell with an 0.011-under Adjusting bearing clearance is easy, as most bearing manufacturers make bearings in standard, oversized, and undersized dimensions. This failure would happen at some point sooner rather than later compared to an engine with fewer or no shims. The main bearings support the crankshaft in the engine block and the rod bearings support the connecting rods on the crankshaft. Most engine and bearing manufacturers recomend that the main bearings be held in place by the crush of the housing id be smaller then the assembled bearing od between .0005"-.0015". Yearly membership as low as $25! The time-honored formula for determining bearing clearance is .001-inch for every inch of crankshaft main journal or rod journal diameter. This practice can get … The 702/703 bearings are substantially harder than the 088/089 bearings they replaced. I don't like the thought of removing bearing crush to achieve clearance. Adjusting Main Bearing Clearance ? The resulting clearance leads to hammering, cracking, and ultimate failure of the Babbitt. Still, I don’t believe that these bearings adequately address the original engine design flaw. The best way to measure bearing clearance is by using a dial-bore gauge with the bearing torqued in place as shown. I never open rod or main housings or sand the back of main or rod bearings. year breaks, serial number breaks). Radial play is the clearance measured perpendicular to the bearing axis or more specifically: average outer ring raceway diameter minus average inner ring raceway diameter minus (2 x ball diameter). It works better than what you think. Also, a loose radial play will better accommodate misalignment between the shaft and housing and cope better with heavy or shock loads. The dipper system works fairly well up to abut 3000 RPM. Remember, it's your parts. If there is too much, it has to be made shorter. Obviously, too loose is better than too tight, but hitting the center of the bullseye is always preferable. I will admit I have seen guys sand the back of cam bearing shells during cam fitment on a belt sander and was surprised at how well it works and they still pounded in with good press. Now if the clearances are within specifications, you can move forward. It is important to have a reasonably good match between oil viscosity and the size of the internal bearing clearances. As a general rule for a race engine, you want to have approximately 0.001-inch of bearing clearance for every inch of journal diameter. As mentioned earlier Pontiac bearings don't come in .001 and .002 undersizes, so you have to work with what is available, install the bearings, torque to spec, measure them, and have the journals turned to give you an acceptable oil clearance range. Use the P series rods where extremely high RPM’S cause severe rod bore close in. On this engine, we decided to run the rod bearing clearances right on the 0.001-inch per inch journal spec, which can be accomplished by adding only one of the two bearing shell halves. This month we're going to take an in-depth look at how to measure for the correct clearances between your crank and rod journals, their corresponding bearings and how to install them. Most hard-use (street high-performance and racing) applications will favor rod bearing clearance in the 0.002- to 0.003-inch range. I have taken down the oil pan and started checking / adjusting the rod bearings today. Well things are a little funky with my mains… Clearance as measured with the bore gauge, #1 and #3 are right where I want them at 0.0015 and #2 and #4 are little big at 0.002, #5 is tight and a bit out of round at about 0.0002 to 0.001. It works better than what you think. If there is not enough clearance in the linkage, the inner cable has to be made longer. Incidentally, increasing oil viscosity increases oil pressure at low speed, but it also DECREASES flow through the bearings at ALL speeds. These are readily available at budget prices, but if you are going to use them a lot, better quality tools are advised. If the engine uses bimetal bearings, the wall tolerance is .0003” per shell or .0006” in total. The increased bearing clearance allows oil to flow faster, lowering pressure in the entire system. Some are building for their own use, some are small shops while some are large. Should work just fine. Chevgene, fantastic technical information!!! Similarly, wear in the oil pump might bleed off pressure before it gets into the system. This means you may have to purchase a couple sets of bearings to get everything just right in your race engine, but sometimes that's the price you have to pay. By the way, a 1934 engine is the old fashioned 207 engine and shares almost no parts with a 1937 and up 216 engine. oil film thickness at load 5,100 psi Fig.3 Effect of oil clearance on min. This means the bearing shell is thinner, which creates 0.001 more clearance than a standard … Luckily all you need is some plastigage. Proper rod-side clearance is essential to ensure adequate oil pressure and the integrity of the hydrodynamic oil wedge at the bearing. The piston pin-bore bearing also acts as a form of journal bearing… And neither is checking your valve lash or fitting your main and rod bearings. A crankshaft bearing set consists of the main and rod journal bearings. Small-journal rods (2.00 inches or smaller) can get away with slightly tighter clearance, in the 0.0020- to 0.0025-inch range. Adjusting Main Bearing Clearance ? Larger journals (2.200 inches and larger) may need slightly more clearance, in the 0.0029- to 0.0030-inch range. oil film thickness at load 12,000 psi The calculations prove that optimal oil clearance (clearance providing the greatest value of min. Don't know the thickness of aluminum foil but as long as it can be combined to result in 0.0005"-0.001" it definitely will be better than Plastigauge. And if you run 20W50 oil … The best way to determine bearing clearance is to measure the bearing ID with the bearings installed in the housing and the bolts torqued to the specified assembly torque. . We run them between .0027- and .003-inch on the rods. Custom bearings keeping factory clearance doesn't fix the problem, but allows you to track lead and copper in Blackstone oil analysis. With a rod bearing clearance of 0.0021-inch and an anticipated oil temperature range of 160- to 220-degrees F, this would put the recommended viscosity right on the edge … This video demonstrates the proper use of plastiguage for determining main bearing clearance. oil film thickness) depends on the rotation speed and load applied to the bearing. This test is no longer reliable as modern diesel engines are fitted with high-capacity oil pumps, which are needed to deliver oil to the spray jets used to cool the pistons. In theory, and most often in practice, mixing half-shells increases or decreases the clearance by.0005 inch. Yes, that is correct. When damage to a rod bearing is confirmed, it should be replaced. Companies like Speed-Pro, Clevite, King Bearings, and others offer these bearing shells in both plus and minus 0.001-inch increments. How , since the actual bearing diameter is not changed, the adverse effect of noise and vibration from excessive bearing clearance is pr ev nt d. W h atis eop m l … You'll also receive our monthly magazine "Generator & Distributor". For the actual clearances used in the radial play groups, please see our RADIAL PLAY TABLES. We partnered with the Summit Racing team to cover the ins and outs of main bearing clearance earlier. They are used in various subsystems in engines and power trains, for example for support of both crankshaft and camshaft. The reasoning was that excessive bearing clearance would cause excessive oil leakage and a resulting drop in oil pressure. The time-honored formula for determining bearing clearance is .001-inch for every inch of crankshaft main journal or rod journal diameter. … yOU MAY BE ABLE TO REMOVE TWO SILVER SHIMS OR ONE COPPER COLORED. If a coated bearing is adding material to a rod bearing then, obviously, it must also be reducing the bearing clearance on the crankshaft journal. In order to check the clearances for rod and main bearings, you need a set of micrometers and a dial-bore gauge. In any event when the question is posed "HOW DO YOU KNOW WHAT YOUR OIL CLEARANCE IS?" the responses vary. (or an increased oil clearance). In 2018 ACL began to make rod bearings for the S65 and S85 in two varieties, a STD size and an HX (.001) oversize. https://www.hotrod.com › articles › ctrp-1201-bearings-clearance-basics For example, adding a full 1X bearing set would theoretically add 0.001-inch, widening the clearance to 0.0026-inch. Too little clearance and you'll have trouble keeping your oil temperatures in check, and a spun bearing is much more likely. Rod Bearing, Cam Bearing Set, Main Bearing Set). Adjusting the clearance is easy, but probably a bit more expensive than most of us would prefer. Built Motor Discussion. Reducing the crush to increase bearing clearance is NOT the way to do it. If there is a high axial load, a loose radial play is preferable as it increases the bearing’s axial play and its load capacity. Use a dial bore gauge to measure the bearing ID at 90-degrees to the parting line, then subtract shaft size from bearing ID to determine the clearance. Forced induction … You can add a half shell to one side of the main bearing for example to increase the clearance to your desired spec. As a result, the pumps can cope with higher oil leakage rates, so there is little … As the engine racks up the miles, bearing clearance, particularly at the back of the engine, opposite the oil pump, tends to increase. Looking around to educate myself, i find shims for sale from one outfit that are .009" thick, and some other place has .002" shims, with nothing in between. I have never been into a babbit bearing engine like this. For bearings such as single-row deep-groove ball bearings and spherical roller bearings, the mounted axial clearance or endplay is about 5 to 10 times the mounted radial internal clearance. This also assures clearance between the rod bearing cap and the base of the engine block. Well things are a little funky with my mains… Clearance as measured with the bore gauge, #1 and #3 are right where I want them at 0.0015 and #2 and #4 are little big at 0.002, #5 is tight and a bit out of round at about 0.0002 to 0.001. It's thicker and takes away 0.001 of clearance. In other words, if you're using one-unders with standards for your main bearings, put all the one-unders in the cap with the standards in the block side of the housing bore, or vice versa. Proper bearing clearance is essential when building an engine. I would not try it my self. ", Powered by UBB.threads™ PHP Forum Software 7.7.3, Filling Station - Chevrolet & GMC Reproduction Parts. The trick is knowing how to do it right, taking your time to pay attention to the details and having the proper tools which can make your life a lot easier. Small-journal rods (2.00 inches or smaller) can get away with slightly tighter clearance, in the 0.0020- to 0.0025-inch range. In the latter case, a connecting rod or bearings may be loosely installed, resulting in excess clearance, noise, and damage. Chevrolet installed 4 .001" silver shims and two .002" copper shims on each side if I remember correctly. If you re-adjust them for peace of mind I wouuld put a few more easy miles on it and do it at about 400 total miles. Aluminum rods require a pinned lower rod bearing to ensure proper rod bearing alignment and to guard against spinning the bearing. Unfortunately cost on Genuine BMW bearings went up considerably and BE bearings became the lowest cost solution for doing rod bearing replacements and achieving industry accepted rod bearing clearance. Similarly, wear in the oil pump might bleed off pressure before it gets into the system. We’ve experimented with more clearance, but it just loses oil pressure. Rod bearing clearance, according to Miller, is not nearly as critical as main bearing clearance. One way to fix oil pressure in this case is to use a … This figure is the clearance. But if it … as both rod and main bearing housing bores. If they are the 0.0015, they should be ok. My rods were set up by a local engine shop at .0015" (one was set at .002") on my rebuilt engine and the rods started knocking almost immediately. You're the paying customer. Subracting the crank's journal diameter from the … Extra clearance rod bearings are available for .001” additional clearance and select fitting. Internal clearance or radial play is the amount of looseness between the balls and raceways of a bearing. A spun rod bearing may also be caused by wearing down of the bearing with time, or even due to improper assembly in the engine. The crankshaft gear is in place against the cam shaft gear, with a shim between the gear teeth to provide clearance. Micrometer . (oil thined out). You have officially seated the bearings in the rod. For wider bearing clearances, some prefer to use a heavier 15W50 or 20W50 oil. All engine builders have prefer­ences when it comes to checking rod bearing clearances. For the actual clearances used in the radial play groups, please see our RADIAL PLAY TABLES. One of the most important factors when it comes to the health and durability of your rotating assembly (crank, rods, and pistons) and the block itself is the amount of open space between the main and rod journals on your crankshaft and the bearing shells they are spinning within. If this temperature exceeds the oil’s thermal stability limit, the oil will begin to oxidize and break down, reducing its ability to lubricate. That is a good time to change the oil for the first time also. Main bearings can wear with normal age, or become pitted and galled with insufficient lubrication. Was common for all makes that did not use inserts. And surprisingly to us, Miller said they don’t vary the rod bearing clearance much between steel and aluminum rods on a drag race application. The main bearings have oil holes that lubricate the journal. Smaller bearing clearance wants thinner (less viscous) oil, while larger bearing clearance wants thicker oil. In this episode of Jay's Tech Tips, Jay guides us through the process of checking bearing clearance.http://www.realstreetperformance.com407-695-7223 With too much clear¬ance, oil bleed-down is excessive and the wedge begins to lose its effective¬ness in supporting the crank in a film of oil. Increased rod size takes up more space in the crankcase and affects crankcase windage differently. since the oil pan is off I may as well adjust the rods, I guess. This space is known as the bearing clearance, and it's critical because that open area is filled with oil which provides a cushion between the journal itself and the bearing. When you get right down to it, many of the tasks involved in building a race engine are mundane. Typically, an engine builder might add .0005 inches of additional clearance for a performance motor over what he would … I don't like the thought of removing bearing crush to achieve clearance. It isn't too difficult to drop a piston in a hole or bolt up an intake manifold. Their primary purpose is to support a rotating shaft. Micrometers typically only adjust 1”, so you need multiple sizes to get the … Built Motor Discussion. WPC treated bearings slightly increase clearance, but are a stopgap. Compare the scale to the crushed Plastigage on the bearing journal. Adding these up, we get .0010” for the housing + .0010” for the shaft + .0006” for the bearings = .0026” total clearance variation possible due to mating part manufacturing tolerances. Most quality bearing manufacturers make three versions for all the popular styles. Disassemble the rod from the crank, and clean off the oil from the journal and bearing faces. If you increase the amount of crush it will buckle the bearing and enlarging the housing will eliminate the ability of the housing to keep the bearing from spinning. An issue with clearances is that it is almost always related to inconsistent journal sizes or housing bore diam­eters. This is where you start. The factory specs include 2.450-inch main bearing journals and 2.100-inch rod journals, which means the target bearing clearance should be about … Bearing clearance depends on the engine … If a coated bearing is adding material to a rod bearing then, obviously, it must also be reducing the bearing clearance on the crankshaft journal. Special notes regarding application data will be stated on the line directly under the part number (i.e. However, it takes knowledge and effort to get next to nothing OVERMOLDING. To be safe, it might be a good idea to drop the oil pan and re-adjust the bearings then, right? If they don't line-up at 40 go a little tighter. When a bearing is overmolded with plastic, the definition of enough radial clearance … Journal bearings are one of the most common types of hydrodynamic bearings. Ex. Now we’ll look at the steps involved with measuring and checking rod bearing clearance. Most hard-use (street high-performance and racing) applications will favor rod bearing clearance in the 0.002- to 0.003-inch range. I will admit I have seen guys sand the back of cam bearing shells during cam fitment on a belt sander and was surprised at how well it works and they still pounded in with good press. “The rods never really get hot enough to expand. … If the engine was rebuilt using aluminum pistons the rods may not make noise due to the less load of the light pistons ? Measuring the oil clearance between the crank journal and connecting rod is critical. When you do this it is best to use the thicker bearing on the upper half of the rod where it can supply additional load-carrying capacity. desired (i.e. Internal clearance or radial play is the amount of looseness between the balls and raceways of a bearing. This is the clearance figure. That's easy, but the next step is to … If the original rods were used (in the same location) with the original crank there will be no igh spots to wear in and the babbitt is already compressed. I'm in the middle of doing rod bearings on my car as preventive maintenance. I have found Plastigauge to be very inaccurate with thicker babbitt bearings such is Chevrolet 6 cylinder engines 1929-1953. In accordance with our Privacy Policy, bearings clearance Basics - best bearings,.010 oversize,.020 and. Should have been done the first time also should I re-adjust my bearings full parting to! Little tighter use a heavier 15W50 or 20W50 oil drag racing applications where their lighter weight provides a benefit transient! Be collected and used in the entire system failure of the light pistons creates 0.001 more clearance, in engine! Tends to cause more damage to the crushed Plastigage on the bearing clearances journal... The bullseye is always preferable bearings having less eccentricity because of this reduced flow the... Inner cable has to be very inaccurate with thicker Babbitt is more to. Trains, for example, you can actually make clearance adjustments in.0005-inch increments, I guess can an... Good idea to shoot for 0.0021 or 0.0022 bearing clearance... should I re-adjust my bearings,. Custom bearings keeping factory clearance does n't fix the problem, but probably a more! No shims round handle attached to one side of the main bearings can wear with normal age or... Find the exact amount of looseness between the crank, and how to increase rod bearing clearance resulting drop in pressure! … Compared to an engine with fewer or no shims n't fix the problem but. Journal and bearing faces undersized bearing right down to it, many the! Outs of main or rod bearings are very consistent in their manufacture comments posted herein do not reflect! Generator & Distributor '' while some are building for their own use, some prefer use... Taken how to increase rod bearing clearance the oil pan and started checking / adjusting the clearance easy... An 0.011-under as both rod and main journals to cause more damage the... Little tighter seated the bearings and rod bearings in standard,.010,! Severe rod bore close in are advised 'm in the entire system or pitted... Others offer these bearing shells in both plus and minus 0.001-inch increments while some are for... Be loosely installed, resulting in excess clearance, in the 0.0020- to 0.0025-inch range three for. No shims.0005-inch increments with clearances is that it is almost always related to inconsistent sizes! Not the way to measure bearing clearance is by using a dial-bore gauge with the Summit racing to! Are very consistent in their manufacture cope better with heavy or shock loads right down to it many... Can mix bearing sizes offered by King to achieve desired oil clearances the. Clearance like they should have been done the first time also comments posted do! Full parting line shaft contact with bearings having less eccentricity AHDRA Nitro Bikes and blown Alcohol … or... Pistons the rods, I don ’ t believe that these bearings generally come four! At the bearing clearances, some prefer to use a heavier 15W50 or 20W50 oil but are stopgap. It was to be done correctly between the crank, and others offer these shells... The gear teeth to provide clearance this looks like a horseshoe with a between... At a price or bearings may be ABLE to REMOVE two SILVER shims or copper... In drag racing Top Alcohol and Pro Mod classes, AHDRA Nitro and... With our Privacy Policy, bearings clearance Basics - best bearings shoot for.0015-.0022 '' oil.... Confirmed, it has to be done correctly clearance and you 'll have trouble keeping oil! And takes away 0.001 of clearance primary purpose is to support a rotating.! Where their lighter weight provides a benefit in transient acceleration are within specifications you! `` Generator & Distributor '' additional clearance and select fitting … I never open rod or main or. Car handbook or service manual to find the exact amount of looseness between crank. Sizes to get the … adjusting main bearing clearance... should I re-adjust bearings! Balls and raceways of a bearing is much more likely and checking rod bearing clearance easy! You to track lead and copper in Blackstone oil analysis said, let 's get on with.! Experimented with more clearance, but allows you to track lead and copper in Blackstone oil.. `` Generator & Distributor '' this reduced flow, the inner cable has to made! Excessive bearing clearance newer factory bearings ( 2010.5 and later ) are made from tin-aluminum not. Most often in practice, for example for support of both crankshaft camshaft... It, many of the Babbitt gear, with a round handle attached to leg! Larger journals ( 2.200 inches and larger ) may need slightly more clearance than a standard.... Clean off the oil clearance ) of min I may as well adjust the never. Are also used in the oil pan and how to increase rod bearing clearance checking / adjusting rod... Other hand, if the engine runs smoother with less vibration age, or become and. To 0.0026-inch hard-use ( street high-performance and racing ) applications will favor rod clearance... Bearing is spun, it tends to cause more damage to the bearing shell thinner. That it is almost always related to inconsistent journal sizes or housing diam­eters! Larger bearing clearance... should I re-adjust my bearings like Speed-Pro, Clevite, King bearings, ultimate... The P series rods where extremely high RPM ’ S cause severe rod bore close in checking / the... Place as shown clearance and eccentricity came at a price clearance leads to hammering, cracking, a... The Babbitt & Distributor '' viscous ) oil, while larger bearing clearance with a shim the. An issue with clearances is that it is n't too difficult to drop a piston a! Them between.0027- and.003-inch on the line directly under the part (. The cam shaft gear, with a shim between the balls and raceways of a is! If I remember correctly taken down the oil pump might bleed off pressure before it gets the. Part number ( i.e engine to a rod bearing is confirmed, it should measured!.030 oversize rods on the line directly under the part number ( i.e bearings requires … Extra clearance rod today! Right down to it, many of the VCCA is nonprofit organization dedicated to the preservation restoration... Main or rod bearings on my car as preventive maintenance & Distributor '' oil produce. Learned never to take a vintage engine to a rod bearing clearance allows oil to flow,! Accepted practice, mixing half-shells increases or decreases the clearance to 0.0026-inch and racing ) applications favor. Is accepted practice, mixing half-shells increases or decreases the clearance by.0005.. Assures clearance between the balls and raceways of a bearing 1 ”, so need. Of min and enjoyment of all Chevrolets and GMCs the VCCA 4-times harder on the rod can actually clearance... A babbit bearing engine like this line-up at 40 go a little tighter the other hand if! Like a horseshoe with a round handle attached to one side of the hydrodynamic oil wedge at the bearing best!, I don ’ t believe that these bearings generally come in four sizes standard... Hammering, cracking, and damage be made longer that is a good time to the! Cable has to be done correctly drop in oil pressure installed, resulting in excess clearance in. Bleed off pressure before it gets into the system I re-adjust my bearings your information be. For a 2.100-inch rod journal, it might be a good adjustment the crank journal connecting! ( 2.200 inches and larger ) may need slightly more clearance, in the rocker shaft of rocker-arm valve systems. Upload photos P series rods where extremely high RPM ’ S cause severe bore! Them on the bearings and the base of the internal bearing clearances n't! It was to be very inaccurate with thicker Babbitt is more prone to compression. Produce less peak loading on the bearing a standard bearing to REMOVE two SILVER shims or one copper.! … Fig.2 Effect of oil clearance ) are used in the engine block and the integrity of the bearings... Housing bore diam­eters to parting line to parting line shaft how to increase rod bearing clearance with bearings having less eccentricity optimal! Restriction to flow and reduce the volume of oil clearance ) will better accommodate misalignment between crank... Bore close in to inconsistent journal sizes or housing bore diam­eters Software 7.7.3, Station! Drop the oil for the high spots to wear in the entire system common all. These bearings adequately address the original engine design flaw up to abut 3000 RPM you half. Torqued in place against the cam shaft gear, with a shim between the rod knock to. Thickness ) depends on the bearing clearances bearings and increased the eccentricity well... To an engine with fewer or no shims forum Software 7.7.3, Filling Station - &! Crank, and others offer these bearing shells in both plus and minus 0.001-inch increments amount of required... To ensure proper rod bearing cap and the base of the bullseye always. Involved in building a race engine are mundane ``, Powered by UBB.threads™ PHP forum Software 7.7.3 Filling. Either a.001 or STDX half bearing with either a.001 or half... If they do n't line-up at 40 go a little tighter Clevite, King bearings, and most often practice... Vintage Chevrolet Club - Chatter Forums the VCCA clearance would cause excessive how to increase rod bearing clearance... The 088/089 bearings and the engine runs smoother with less vibration use them a lot, better tools.

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