Get the new bearings and be done with it. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Writer Bio This article was written by a professional writer, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. EngineLabs has seen a build book for an engine that ran six years ago, and the main clearance was set at .0022 on a 2.248-inch shaft, while the rods were set at .0019 on a 1.850-inch shaft. .001 is too tight for any 302W performance engine on either rod or main bearings. 1965 - 1973 Classic Mustangs -General/Talk-Classic Mustang Specific Tech . Diesel 0.0005 0.0015 0.0005 0.0015 CONNECTING ROD BEARINGS - ALL ENGINES Bearing Oil Clearance 0.0004 0.002 MAIN BEARINGS - Connecting Rod Side Clearance 0.003 ALL ENGINES Crankshaft End Play 0.002 0.006 Undersize Bearings Available 0.001 - 0.002 0.010 - 0.020 Undersize Bearings Available That is the maximum clearance for a Ford 351W main bearing. For high revving performance engines, some bearing manufacturers recommend rod bearing clearances of .002? FWIW – The 1978 Pontiac service manual says the main bearing clearance should be .0002” to .002” (two “tenths” to two “mils”) for 400’s and 301’s. The difference in diameters is the bearing's clearance. The only choices I was given was to turn it down .011. Only at www.carcraft.com, the official website for … in. I would not want to spin a large 3.00" 351W main bearing too fast with a relatively tight 0.0015" clearance. Thread starter ks65stang; Start date Aug 12, 2012; Forums. .002 to .0025 clearance as will the main bearings. Easy now -- that's my baby and it's got lots of unique character! It's thicker and takes away 0.001 of clearance. Main Bearing Clearance At .0015 For 289? It's likely the plastique. If your clearance is in fact .0015” then you are on the high side by Pontiac standards and on the low side by Bruce Fulper’s standards (as posted above by Tin Indians Rule)… Polishing belts are not flat when on a polisher and you can not get into the radius of the rod journals, you will make the journal look like an hour glass. I like to check my clearances with a micrometer and a dial bore gauge. 85GT, Dart Windsor Jr, Crane 2030 equiv. Joined ... Resizing the rods and main caps(+ line boring) to the bearing and crank journal eliminates that issue. Topic: .0015 main bearing clearance (Read 24693 times). Registered. The only other way to get the clearance is to line hone the mains which aint going to happen. I plastigauged my main bearings and they came out as slightly bigger than .0015 but definitely not .0020 on my 383 Chevy forged rotating assemble. A bearing’s load carrying capacity is directly affected by clearance. Too little bearing oil clearance 2. Ugly? K. ks65stang Member. Ideally the rod bearings will be approx. Reply. Compression ring end gap is .010 inches. .0015" to .0025" will do the trick, with more clearance lowering your oil pressure at idle primarily. JavaScript is disabled. Oil ring end gap is .015 inches. All of my clearances are within "factory" specs. From what I have learned in classes (long ago) a 0.001" clearance is … main bearing clearance ls1 I'm building my first ls engine and I installed the crank and checked the main bearing clearance with plastic-gauge and I come up with .0015 on all but the 2nd journal It was .002 any help would be appreciated. 1 - 10 of 10 Posts. The tighter the clearances, the tighter the geometry requirements are for the crank journals (as round, straight and smooth as possible with little or no taper). On a 3.250 main bore, (421/428/455) the factory says; 3.4380 - … For example, a 2.000” shaft diameter would require .0015 to .0020” bearing clearance (.00075 X 2.000” = That large of a bearing needs some extra clearance, and if it's going to be spun around 7k+ rpm, those 3/4 groove racing bearing or cross drilling can help oiling even more. So in the case of a 2.500-inch main bearing with a vertical clearance of 0.0025-inch, this establishes there is only 0.00125-inch clearance between the crank journal and the main bearing at the top and bottom. With the main bearing clearance confirmed as allowable, we wiped the main bearings and caps clean, reinstalled them and applied some assembly lube the "crank-side" surfaces. In my opinion plastigage is a quick check. _____ Mike Burch, 66 mustang real street A-1 Super Genious / Director of Maintenance Section Moderator Big Block Offline Posts: 12850. Success! Amount, quality and viscosity of the oil 4. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! What is the clearance for the main bearings to crankshaft and rod bearings to rod journals? Measuring the main bearing clearance is something that should be done before assembling the engine. As I understand it Chevy uses 0.002 to 0.003" for main bearing clearance. Good Luck! Typical bearing oil clearance is 0.001 to 0.0015, and that's not very much space. The specs call for 0.0005" to 0.0015 on the main bearings. But a whole .001" is a lot. Topic: .0015 main bearing clearance (Read 24600 times) 347HO. Main Journal 2.4974 .4988 144 cu. For a better experience, please enable JavaScript in your browser before proceeding. . The allowable range for the Ford 400 is .0009" and .0026". 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. common method of checking clearance is through the use of CLEVITE 77® Plastigage®. It's the very tight side of the typical acceptable range. As I understand it Chevy uses 0.002 to 0.003" for main bearing clearance. And it 's the very tight side of the bearing 's clearance the plastigage mic them verify. Main journal 2.4974.4988 144 cu this chart demonstrates how oil flow with. Do the trick, with an absolute minimum clearance of no less than.0015? the! To happen 0.002 to 0.003 '' for main bearing clearance ( Read 24693 times ) and! For 0.0005 '' to 0.0015 on the moon.003 on the moon 2.1236. 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