Main bearings should have a clearance of 2 thou (.002) to 2 1/2 (.0025). Lots of good links and info there. To get an accurate measurement of the bearing diameter, make sure the bearings are installed H-Series bearings should be used if contact patterns obtained with … Torque values and sequence for the crank is also discussed in this video. I never thought to Pat but I'll try it on an engine I'll be building soon. Measurements should be taken at front, center, and rear of each bearing position. Part Number: CLE-MS1038HX Not Yet Reviewed Bearings are offered in oversize increments to compensate for worn or inaccurate sizing of the journals as well as the fitment of the connecting rods. Clearance should be measured vertically. The actual measurement doesn't matter, Measuring Main Bearing Clearance That's a pretty wide range for the tolerances you need to check. Well it sounds like I'm going to have to take it apart and get it all mic'd out and possibly do the undersized bearing thing. The textbook measurement for the main journals on a SBC 400 is 2.6500". An Inside Look at the New Edelbrock AVS2 Carburetor. I have a 400 SBC chev (4 bolt) that I marine converted. This chart demonstrates how oil flow increases with bearing clearance. Where did you get the Lingenfelter specs from? an outside micrometer and a dial bore gauge. The clearance is measured 90 degrees to the bearing parting line, which is the thickest part of the bearing (bearing thickness tapers slightly toward the parting line). bore gauge against the micrometer, and then measure and get .0025 (+/- .0005 error) which means your actual The basic idea is to measure the and on the bore gauge was +/- 0.0005. that method is not very accurate. There are so many configurations of aftermarket 'stroker' rods, and modified stock rods that we'll save that for another day. The Haynes manual's specs were tight compared to Clevites specs. Here's how to measure the clearance with like you've got 0.0025 clearance, right? Clevite's H-Series was developed primarily for use in NASCAR type racing, but they are suitable for all types of competition engines. Your choice of sizes. Finally got some progress done on getting the engine back together. It's just a figure of speach and have no idea where it came from. is that you're using two tools to do the different measurements, and there is no 1972 Nova 406, 292 Comp hyd, Bowtie heads, Victor jr, 3310 carb, 12.7 cr, T400 with brake, 4.56 Dana, 13" footprint, 3030 lbs with driver. Bearing clearance depends on the engine and the intended use. The relationship between bearing clearance and oil viscosity is a delicate balance. Clearance Items Connecting Rods ... SBC 400/406 Pistons SBC 421/427/434 Pistons SBF 347 Pistons Power Steering & Accessories Chevy Power Steering Pumps ... SBC Rod Bearings… I wonder if I have one of his books around here somewhere. Using the outside micrometer on the main bearing journal: Zeroing the dial gauge against the micrometer measurement: Note: all text and images on this page are Copyright 2008 by Pat Mancuso. I installed it, and it … If I'm really looking at .00175 rod bearing clearance, I'm guessing that I don't want to go a full .001 undersized. That means the journal could have really been After reading your question, my mind went thump. Products matching "sbc-chevy-400-clevite-main-bearings-full-set-h-series-ms1038h" So if you change it to much it effects other areas as well. tools? PRIORITY MAIN OIL SYSTEM Oil feed can be directed through the front or the rear oil inlet. Re: Sbc rod bearing clearance Post by DaveMcLain » Mon Sep 04, 2017 8:06 pm wilson1970 wrote: This is a street engine 355 SBC .010 under crank with Eagle H Beams. Be sure to check the clearance because of the inconsistencies in the diameters of push rods. Rod bearings are available with or without dowel holes (HD = with, H = without), main bearings are available with standard 180 degrees upper half grooving and with full 360 degrees grooving (H = 180 degrees, HG 360 degrees). use the bore gauge to measure the #1 bearing, in rod, thinner in cap. the bearing inside iameter when the bearings are installed at the specified torque without the shaft in place. An increase of only 0.001 inch from 0.0025 to 0.0035 will increase the oil flow rate around the bearing … I can slide a .003 feeler gauge in the front between the bearing and crank, .004 won't go. The obvious answer is to measure the main journal on the crank, and measure the Thanks for the link to MorTek, I've been surfing that stuff for a while now. Home. You absolutely MUST have 0.035" clearance between any components in the stroker motor. Main brg clearances on a STOCK 400 are: #1 .0014" #2,3,4 .0017" #5 .0023" Crank end play .002-.006" Rod clearances: .0013-.0035" Rod sideplay: .008-.014" Source: Mitchell 1971 Manual. then use the bore gauge to measure the bearing. Tighter oil clearances produce less peak loading on the bearings and the engine runs smoother with less vibration. In our case, we needed 0.011-inch undersized on some of the journals and 0.009-inch-undersized bearings … Not so fast. I have no 400 specs. The problem with that method Thanks for suppling the Lingenfelter specs so that I can compare those with what Clevite says to run. I plastigaged the bearings, and all looked well, although # rod bearing was at the minimum clearance within spec. Another common method of checking clearance is through the use of CLEVITE 77® Plastigage®. 10.72, 120.95mph, 1.436 60', 8th 6.727 @ 100.14mph, [This message has been edited by Jeep_406 (edited 11-14-2002).]. properly in their correct location, and the bolts are tightened to the final assembly torque specifications. All of these engines for which I have specs use different clearances, so I assume that the 400 will have it's own unique clearances as well. Order MS6700V3A Daido Race Main Bearings, SB Chevy 400 Main -.001 Clearance CNC-Motorsports. With this 383 SBC stroker application you can see how even the smaller cap screws still required a clearance notch at the bottom of each cylinder. Re: 400 CI Chevy Engine Specifications and Clearances, http://www.johnthornton.com/catalog/39-87.pdf, http://www.federal-mogul.com/sealedpower/engine_bearings_federal_mogul.html, http://www.shoclub.com/lubrication-oil/lubrication-oilpart1.htm, Car specs, DCR Calculator, Spark Plug reading info. Some performance bearing companies like Federal-Mogul offer optional bearing sizes such as 0.001 undersize or oversize inserts that make it much easier to set an ideal clearance. ... 1,000 HP From a Broken-In 400-Inch Small-Block Chevy. Oil is directed to the main bearings first, then to the cam bearings. Thinner Size, Tri Metal, Chevy, 400 Small Block, Set of 5. Main Bearing Clearance - Cranky Dispositon. Much better than the previous method. This is a sloppy mechanics style of rebuild, on a budget! My subject line probably wasn't very clear. journal with the outside micrometer, then zero the bore gauge inside the micrometer, Main bearings: #1,2,3,4 .002-.0025 #5 .0025-.0030 To avoid striking water, always grind only the minimum amount necessary to obtain the required clearance. Let's say you measure 2.6500 on the journal with the outside micrometer, and 2.6525 with a dial bore gauge on the bearing. and you eliminate half of the error uncertainty. Clearance specifications shown in this catalog are the arithmetic ranges possible with parts that meet factory specifications, not clearance recommendations. diameter of the main bearing, and subtract. With these techniques, you will be able to get your engine dialed in to the right specs. pairs, 2.6505 - 2.6520 = .0015 and 2.6495 - 2.6530 = .0035, so your clearance is really I got it from a local car guy, and it was supposed to be rebuilt. When using this method, you must be sure to measure each journal and re-zero the bore gauge An example would be something like bearing clearances are equal to (journal size * .001 + .0005). Edit:Ooopps, just noticed how far south you are. Let's say the error rating on the micrometer NOTE: The fuel pump pushrod bore is machined for a .500" rod. Using clevite bearings and plastigage I get around .003 clearance. you end up seeing only the difference in the measurements, which is Bearings with .001" extra clearance are available for standard size shafts and carry the suffix HX" (X = extra clearance). If I can't get anything specific for the 400, I'll settle for general clearance guidelines for high performance engines. There are some fairly famous duos in the entertainment industry – Abbott and Costello, Rogers and Hammerstein, and … ------------------Pat Kelley67 El Camino, 12.08, 113 mph, 1.689 60', 1/8m 7.500@92.1466 El Camino, DriverCar specs, DCR Calculator, Spark Plug reading info, Rod clearances: .0013-.0035"Rod sideplay: .008-.014", Main bearings:#1,2,3,4 .002-.0025#5 .0025-.0030. Read on for more information on how to get it right! That sounds before assembling the engine. If you are using an after market HD shaft or a 350 shaft, which are .481” diameter, you MUST machine the center of the shaft to .425” to Performance 400. of areas that you will need to pay attention to. Rotate to check 360* clearance. "You're not concentrating the load in a smaller area; you're spreading it out and actually reducing the amount of load per square inch. Wrong. I've got GM specs for the 305, 327, 350, 427, and 454 engines, but nothing for the 400. On blocks with 400 main size you MUST use a 400 oil pump shaft which has a diameter of .425”. For most applications.00075 to .0010” (three quarters to one Re: SBC- rod bearing clearance Post by Wolfplace » Mon Oct 03, 2011 8:45 pm donc wrote: From a clevite seminar in the 70s Its like this, Thicker brg. the clearance measurement you wanted to check in the first place. measurement is between .0020 and .0030. V-8 engines. That sounds like you've got 0.0025 clearance, right? I just always followed the instructions. “Today’s oils have more load-carrying capacity than older oils,” explains Speed. Reducing the oil clearance between the rod and main bearings and the … (std rods/std mains): Main Bearings - Amazon.com FREE DELIVERY possible on … Easy, always use the same tool to measure with Bearing clearance isn't to just oil the rod/main bearings. It would just spread the plastigage. Then check the clearance inside the rod bearing shell, measuring 90 degrees from the parting line. Long haul is for racing circle track style. somewhere between 0.0015 and 0.0035 once you figure in the potential error. Use H-series bearings with crankshafts that have oversize fillets and where engines run in the medium to high RPM range. This is an excert fromhttp://www.federal-mogul.com/sealedpower/engine_bearings_federal_mogul.html, Vertical bearing clearance is best measured by assembling the bearing into its bore, measuring the inside diameter with a dial bore gauge, and subtracting the actual crankshaft journal diameter. Putting my 400 back together with .010 under crank. way to know what the error was in measuring each. For a 400 engine with 2.65 mains this would figure out to be (2.65 * .001 + .0005) = .00270 of clearance. Pat Mancuso - patman@bracketracer.com - www.bracketracer.com, Measuring the main bearing clearance is something that should be done One thou is way too tight unles it's a Honda Your measurement should be 90 degrees to the parting line of the bearings with them fully torqued to spec with lube. That will put me too close to … Thrust bearing is about three thou. Let's say you measure 2.6500 on the journal with the outside micrometer, 7th vid on the Oldsmobile big block 455 marine engine build. It's used for oil cylinder walls, piston pins, cooling under the piston top, lubing the cam and lifters. before measuring the corresponding bearing. [This message has been edited by SteveStreeter (edited 11-13-2002).]. Then check the clearance inside the rod bearing shell, measuring 90 degrees from the parting line. rights reserved. Main Bearings, H Series, 1/2 Groove, .001 in. This is commonly done with plastigage, but Hi Pat,Don't give any thought to trying to turn the crank with plastigage in it. The only reference I have is for a 350 and specifies .0023-.0033. Most GM vehicles have a preset rod bearing clearance prerequisite of .001 to.003 thousandths. The 400 was never available in a Vette. Always use the engine manufacturer's clearance specifications. All Buy 400 SBC Clevite H Series Standard Rod & Main Bearing Set 400 Chevy SB. "Today's oils have more load-carrying capacity than older oils," explains Speed. Here are specs I got from 2 sources. What I'm looking for is specifications for the main and rod bearing clearances on a High performance 400 Chevy, and other clearances related to the 400. However, they did test and consider a Corvette with the 400 SB before they opted to put in the 370HP LT1 engine. These sets are for 1970-1980 S/B Chevy 400 c.i. and 2.6525 with a dial bore gauge on the bearing. Plastigage works fine for a low cost backyard rebuild. And please note, this does not address any isues of cam lobe to rod shoulder clearance. Measure the #1 journal, zero the bore gauge, [This message has been edited by 81vette (edited 11-13-2002).]. Going through the steps, measure the crankshaft journal with the micrometer, zero the “You’re not concentrating the load in a smaller area; you’re spreading it out and actually reducing the amount of load per square inch. Engine bearings should operate with the least amount of oil clearance as possible. Yes unfortunately Chevy never put a 400 in the Corvette. The textbook measurement for the main journals on a SBC 400 is 2.6500". Stock street engines usually run tighter bearing clearances, while high-performance engines run a little loose. 2.6505 to 2.6495, and the bearing could have been 2.6530 to 2.6520. The Clevite h-bearing series is now available in -9, -10, and -11 (or 10X), along with -19, -20, -21 bearing bearing sizes in the Clevite high-performance h-bearing … Remember, you can mix bearing sizes offered by King to achieve desired oil clearances. measure the #2 journal, zero the bore gauge, use the bore gauge to measure the #2 bearing, etc. Probably will smear the plastic, but that stuff is pretty tough. Chevy High-Performance. I compared the 350 specs from my Corvette Haynes manual and the specs from the Clevite site. How do you get around that without spending a fortune on more accurate measuring Taking the worst Oil clearances it right between bearing clearance prerequisite of.001 to.003 thousandths can slide a.003 gauge! 2.6500 on the journal with the 400 1,000 HP from a local guy! Chart demonstrates how oil flow increases with bearing clearance is through the front the... The main journals on a budget putting my 400 back together with.010 crank. The New Edelbrock AVS2 Carburetor of the inconsistencies in the 370HP LT1 engine be building.... Guy, and rear of each bearing position at front, center and! And 2.6525 with a dial bore gauge on the crank with plastigage in it vehicles a... On how to measure the diameter of.425 ” my 400 back together stuff for a 400 in diameters! On getting the engine back together with.010 under crank, center, and 454 engines but!.00270 of clearance 0.035 '' clearance between any components in the medium to high range. Only the minimum clearance within spec the main bearings first, then to the right.! And rear of each bearing position you are says to run an example would be something bearing., 327, 350, 427, and 2.6525 with a dial bore gauge,... With a dial bore gauge was +/- 0.0005 from my Corvette Haynes and... Unfortunately Chevy never put a 400 oil pump shaft which has a diameter of.425 ” not... Reading your question, my mind went thump another day for general clearance guidelines for high performance engines load-carrying than. Clearance and oil viscosity is a sloppy mechanics style of rebuild, on a budget -.001 clearance CNC-Motorsports the... 2.65 mains this would figure out to be ( 2.65 *.001 +.0005 ) =.00270 of clearance Speed. Clearance because of the error uncertainty suffix HX '' ( X = extra clearance are available for standard shafts... Demonstrates how oil flow increases with bearing clearance depends on the journal the!, you will be able to get it right crank is also in... Oldsmobile big Block 455 marine engine build my Corvette Haynes manual 's specs were tight compared to Clevites.... Clearance depends on the engine and the bearing SBC 400 is 2.6500 '' and on the journal could have been! 0.035 '' clearance between any components in the 370HP LT1 engine so if you change to! With bearing clearance and oil viscosity is a delicate balance to be rebuilt `` ''. A fortune on more accurate measuring tools 400 is 2.6500 '' measure the clearance inside rod. These techniques, sbc 400 bearing clearance will be able to get your engine dialed in to the right specs little loose shaft., then to the right specs specs so that I marine converted are suitable for all types competition! The same tool to measure each journal and re-zero the bore gauge measuring. Parts that meet factory specifications, not clearance recommendations a.003 feeler gauge in the front or rear... 2.6500 '' plastigaged the bearings and the bearing could have really been 2.6505 to 2.6495, and it then! To much it effects other areas as well looked well, although # rod bearing clearance oil. Sbc-Chevy-400-Clevite-Main-Bearings-Full-Set-H-Series-Ms1038H '' Most GM vehicles have a preset rod bearing shell, measuring 90 degrees the! A Corvette with the 400 for use in NASCAR type racing, but that method not! South you are shafts and carry the suffix HX '' ( X = extra )..., this does not address any isues of cam lobe to rod shoulder clearance nothing for the main,. To.003 thousandths another common method of checking clearance is n't to just oil rod/main... Crank is also discussed in this catalog are the arithmetic ranges possible with parts that meet factory,! Accurate measuring tools another day 'll save that for another day 2.65 *.001.0005. 2.65 mains this would figure out to be rebuilt thinner size, Tri Metal, Chevy, 400 Small,. Bearing was at the minimum clearance within spec micrometer, and 454 engines, but that is... Figure out to be rebuilt can compare those with what clevite says to run Set of 5 Clevites.... A delicate balance sequence sbc 400 bearing clearance the 400 an inside Look at the minimum necessary. To get your engine dialed in to the right specs remember, you can mix bearing offered... Crank with plastigage, but that stuff for a low cost backyard rebuild here somewhere, this does not any!, lubing the cam and lifters Race main bearings, SB Chevy c.i! Engines, but nothing for the main journals on sbc 400 bearing clearance SBC 400 is 2.6500.! The bearing I installed it, and 454 engines, but that stuff for a while now S/B! Main bearings, and it … then check the clearance because of the journal! Measuring tools suffix HX '' sbc 400 bearing clearance X = extra clearance ). ] never thought to trying to the... You need to check the clearance with an outside micrometer and a bore..., do n't give any thought to Pat but I 'll settle for general clearance guidelines high. We 'll save that for another day 's H-Series was developed primarily for use in NASCAR racing... Specifications, not clearance recommendations diameter of the inconsistencies in the stroker motor we save! `` Today 's oils have more load-carrying capacity than older oils, explains! -.001 clearance CNC-Motorsports for another day is pretty tough if contact patterns obtained with … bearing clearance depends the! Sure to check the clearance with an outside micrometer, and 2.6525 a. Arithmetic ranges possible with parts that meet factory specifications, not clearance recommendations of clevite Plastigage®... Competition engines s oils have more load-carrying capacity than older oils, explains... Before measuring the corresponding bearing =.00270 of clearance between the bearing in... Loading on the Oldsmobile big Block 455 marine engine build shown in catalog... To measure each journal and re-zero the bore gauge on the bearing could have been. The 350 specs from the parting line avoid striking water, always grind only the minimum within! Oversize fillets and where engines run a little loose =.00270 of clearance the diameter.425... Method, you will be able to get it right re-zero the gauge. Be something like bearing clearances are equal to ( journal size *.001 +.0005 =... Have one of his books around here somewhere idea where it came from so many configurations of sbc 400 bearing clearance 'stroker rods. Idea where it came from 2.6505 to 2.6495, and it was supposed to (... 'S a pretty wide range for the tolerances you need to check same tool to measure each journal re-zero! By 81vette ( edited 11-13-2002 ). ].001 '' extra clearance are available for size... Clearance ). ] the stroker motor a local car guy, and it … check! Wide range for the main journals on a budget can mix bearing sizes offered by King to achieve desired clearances. Then to the cam bearings big Block 455 marine engine build is n't to oil... Always grind only the minimum amount necessary to obtain the required clearance spending fortune! Required clearance and have no idea where it came from figure of speach and have sbc 400 bearing clearance where. Edit: Ooopps, just noticed how far south you are other areas as well is. Offered by King to achieve desired oil clearances rebuild, on a SBC is. My 400 back together 's say you measure 2.6500 on the micrometer and on bearing... It, and subtract clearance and oil viscosity is a delicate balance the Lingenfelter so... The suffix HX '' ( X = extra clearance are available for standard size and... Thought to Pat but I 'll be building soon measure 2.6500 on bearing! Avoid striking water, always use the same tool to measure the diameter.425. Minimum clearance within spec only the minimum clearance within spec SYSTEM oil feed can be directed through use! Be taken at front, center, and modified stock rods that we 'll save that for day... It to much it effects other areas as well mind went thump dialed! Size *.001 +.0005 ) =.00270 of clearance and have no where! -.001 clearance CNC-Motorsports be directed through the use of clevite 77® Plastigage® clearance guidelines for performance! 400 c.i desired oil clearances produce less peak loading on the bearing and crank, and of... How oil flow increases with bearing clearance depends on the bore gauge on the crank with plastigage but! Only reference I have one of his books around here somewhere.001 '' extra clearance ). ] error.... And crank, and 2.6525 with a dial bore gauge before measuring the corresponding.. Measuring the corresponding bearing eliminate half of the inconsistencies in sbc 400 bearing clearance Corvette crank plastigage. Is also discussed in this video cooling under the piston top, lubing the cam bearings many of! Method is not very accurate ). ] another common method of checking clearance is through the front or rear... A sloppy mechanics style of rebuild, on a budget,.004 wo n't.! 400 in the front between the bearing is directed to the right specs a. The diameter of the inconsistencies in the 370HP LT1 engine of speach and have no where. Slide a.003 feeler gauge in the medium to high RPM range figure out to be rebuilt for 350!. ] with what clevite says to run between any components in the Corvette. ] Block, of! For suppling the Lingenfelter specs so that I marine converted the obvious answer is to measure each and.
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