Two of them at .0022 and one of them at .0023 Then I did two (ran out of plasti-gauge) plasti-gauge measurements on the same rod. Mains thicker brg. (ALWAYS consult your piston manufacturer for recommended of clearance. Clutch pressure plate                                                                                    Then did three measurements on a rod bearing with my mic and snap gauge. The kit included a new crank and rods by Eagle and Clevite 77 bearings. These all seemed ok. After reading what you guys have said, I am feeling a little better. Let’s say our loosest rod bearing measured 0.0028-inch while the tightest rod came in at 0.0023-inch – creating a spread of 0.0005-inch. Got my crank/rods/pistons back from balance, and im going to start puttin everything back together. 11/32           Bearing clearances for higher RPM in a SBC? 25 lb. ft. Unfortunately, beacause I have checked this clearance twice and have over- stretched the bolts. Recommended: 0.080 intake, 0.100 Exhaust (steel rods) 0.100 intake, 0.120 by Belgian1979 » Mon Oct 03, 2011 3:13 pm, Post manufacturer.                                         30 lb. 7/16 - 14     Head bolts                                0.035 MINIMUM  including gasket (steel rods), 0.060" MINIMUM aluminum ft. 3/8 - 16         85 lb. ft.                 plugs (13/16 hex)           On a small-block Chevy with a large journal main bearing size of 2.100-inch, this would put your main bearing clearance at 0.0021-inch. You need a little more on the rear main to allow more oil to go to the top side of the engine. The traditional bearing clearance standard for street and most performance applications has been 0.001-inch of clearance for every one inch of crank journal diameter. 0.002 - 0.025" , side clearance 0.010 - 0.020", Main bearings                                             pin), Piston ring gap                                            Connecting Rod Connecting Rod Bearing Clearance (Production) 0.033-0.078 mm 0.0013-0.0031 in Connecting Rod Bearing Clearance (Service) 0.025-0.063 mm 0.0010-0.0025 in Connecting Rod Side Clearance 0.15-0.68 mm 0.006-0.027 in Connecting Rod … ft.                 in. 80 lb. balancer                  Main and rod bearings clearances. ft. TORQUE                    You mentioned oil pressure I think in the main bearing clearance thread. Locktite     (0.006" stretch, frequently 55-60 lb. 35 lb. The use of studs offers greater clamping force ft                   Building the bottom end of the shortblock for the blown SBC 406 going in the 48 Ford Coupe. antiseize rechecked rod bearing housing and the … Distributor clamp                     ft. Exhaust manifold                     by Belgian1979 » Sun Oct 02, 2011 9:00 am, Post by robert1 » Mon Oct 03, 2011 2:43 pm, Post Locktite instructions for best results. 25 lb. I purchased a brand new fully balanced rotating assembly from Summit racing. in. The old rule of thumb is to provide .0007? And once again, because too little bearing clearance can mean a spun bearing… early rod bolts                           The normal range for Hipo street is .002-.003. Only at www.carcraft.com, the … 25 lb. to .001? clearances. ft.                                         Rod bearings 0.002 - 0.025" , side clearance 0.010 - 0.020" Main bearings 0.002 - 0.003" , 0.005 - 0.007 crankshaft end play Piston to head clearance 0.035 MINIMUM including gasket (steel rods), 0.060" MINIMUM aluminum rods Valve to piston clearance MINIMUM 0.020" exhaust , … I belive there is a mistake in the rod brg clearance .002 to .025, should be .002 to .0025 An easy way to look at this is, if your main journal is 2 inchs, then a .002 clearance works, If rod journals is 1.5 inches then a .0015 works Works for big mains & rods as well, Like a 5.5 inch main, .0055 clearance ft. 1/2 - 14     Temp sender unit                      Discussion in ' The Hokey Ass Message Board ' started by Hot Rod To Hell , Apr 25, 2011 . I guess at the very least I'll be sending back the high volume oil pump and going with a standard volume. I have a like new goodwrench 4 bolt 350 that I re-did as a performance build. The resulting wiping action causes premature bearing failure. However the .001 smaller bearing will reduce clearance to .00175 which is not good. 20 lb. Rocker arm STUD                   i subtracted .0015 from the 2.325 and came up with 2.3235. so i adjusted my outside mic to 2.3235 and once again zeroed my dial bore gauge. Looks like a little to much. in.                                                                                                                            by zums » Sun Oct 02, 2011 7:57 pm, Post by Belgian1979 » Mon Oct 03, 2011 4:42 pm, Post Other option is an undersize bearing for the front main if my machinist feels that is too tight. So for a 2.100-inch rod journal, it's always a good idea to shoot for 0.0021 or 0.0022 bearing clearance. This should create another round of BS but that is what I would do. 20 lb. by topfuelrocket » Sun Oct 02, 2011 10:49 am, Post 25 lb. I recommend you check lifter bore clearance also. I have a completely stock Corvette that turns 1,800 rpm at 75 mph. 20 lb. ft. require a different torque than stock cast iron units. ft. USE                                    All of my clearances are within "factory" specs. i set up an outside mic to 2.325 and zeroed my dial bore gauge to that dimension. to .002? Oil delivery or oil pressure issues 5.                                             Crank is slightly undersize (2.098") and with standard bearings i'm getting .00275" clearance. Exhaust aluminum rods. Oil pump                                    Chevy Truck Forum | Silverado Sierra GMC Truck Forums. 80 lb. in cap thinner in block. Main and rod bearings clearances. I measured them with standard bearings. 0.022"                     The most popular small rod bearing journal diameter now is 1.850-inch, down from the Honda 1.88-inch bearing. by donc » Mon Oct 03, 2011 4:34 pm, Post 0.002 - 0.003" , 0.005 - 0.007 crankshaft end play, Piston to head clearance                           Flywheel housing                     I'll be damned if I would drive it with 18 lbs of oil pressure (10 psi per 1,000 rpm). by Wolfplace » Mon Oct 03, 2011 3:23 pm, Post Consequently, if the crankshaft has two-inch diameter journals, the rod and main bearings should be assembled with about .0015? The recommendation for For a hot street SBC, what rod and main clearances do people like to see? in. that seems to be very usefull. rods, Valve to piston clearance                          Hold up!! ft.                   Aluminum (aftermarket) heads and intake manifolds ... Industry standard is 0.0015-0.0020 on most engines Re: Main and rod bearings clearances. antiseize. Locktite     (0.005" stretch). 0.0006  - 0.0008" in piston, 0.0008 - 0.0010" in rod for full floating 30 lb. 20 lb. Rod bolts                                  Jul 07 2016, 3:26am.                   Have been searching but didn't seem to find what i was looking for. ft. After measuring all eight rod bearing clearances and using shell halves to set the clearances, it’s very common to have a clearance spread between the rods of perhaps 0.0004- to 0.0005-inch. Sealant, 3/8 - 24        MINIMUM end clearances        Top        • The value of clearance required for formation of the maximum value of minimum oil film thickness is lower in bearings having greater eccentricity. I just checked the main bearing clearance using plasti-gage and found all the mains to be at .0015 for the full width of the bearing surface. Typical bearing oil clearance is 0.001 to 0.0015, and that's not very much space. Looking in my "factory" service manual the specs call for: main bearing clearances: front = .0008 - .0020 intermediate = .0011 - .0025 rear = .0017 - .0032 rod bearing = .0013 - .0035 This clearance spec assumes that everything is completely square with the main bearing housings, there is no taper or eccentricity in the crankshaft main or rod bearing journals, and that the engine is very carefully fitted to this spec. The engine is very difficult to rotate by hand. bearing and the journal allows for metal-to-metal contact. ft. by robert1 » Mon Oct 03, 2011 4:12 pm, Post pin (End play 0.0 - 0.005", Rod bearings                                               So a typical small-block Chevy 2.200-inch rod journal would call for a bearing clearance of 0.0022-inch. Oil Pan bolt                            ft. 14mm       Spark The bearings are King brand and crank and rods are std scat with capscrew ARP. 60 lb. by Wolfplace » Mon Oct 03, 2011 4:45 pm, Powered by phpBB® Forum Software © phpBB Limited, General engine tech -- Drag Racing to Circle Track. Under maximum load, the oil is squeezed into a very tiny area of clearance measured with five digits to the right of the decimal point–perhaps as tight as 0.00025-inch. ft. 1/2 - 20       Harmonic Here are a few scans of instructions from Edelbrock When checking my bearing clearances with plastigage I’m getting between .001″ and .0015″ on the rod bearings and between .002″ and .0025″ on my main bearings.                       Oil          0.016", Wrist pin                                                        by Wolfplace » Mon Oct 03, 2011 3:06 pm, Post 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. of bearing clearance for every inch of shaft diameter in a stock engine. ( 5/8 hex)              So, just to be sure, even though the clearance between rods 5 and 6, 7 and 8 are also a little high, continuing with the rebuild is ok? 70 lb. Size                ↳   Vintage/Classic/Historical Engine Tech, ↳   3V Performance Engine & Valve train Development, ↳   Race Cars & Parts - For Sale or Wanted, http://www.small-block-chevy.com/assemblyspec.html. by Belgian1979 » Sun Oct 02, 2011 2:31 pm, Post Sealant in. Many pistons require a tighter bore), Piston to bore                                             ft.                       would require .0015 to .0020” bearing clearance (.00075 X 2.000” =.0015” and .0010 X 2.000” = .0020”). ft. required to obtaim proper stretch)                       by governor » Sun Oct 02, 2011 9:10 am, Post The remainder of the clearance is found on the unloaded side–the top side of the main bearing or the bottom side of a rod bearing. 65 lb. 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. Lubricant, 1/4 - 20          Oil pan to front cover             Flywheel                                   The kit included a new crank and rods by Eagle and Clevite 77 bearings. ARP is adamant about using a special moly lube or ARP thread Rod bearing clearances (distance between rod bearing and crankshaft journal) were all between .0015 and .002. Tight is usually a good thing however I have measured the rod bearing clearance on the first 2 cylinders and I get .0015". The crank has been turned .010. ALWAYS follow the manufacturers Water pump                             20 lb. The textbook measurement for the main journals on a SBC 400 is 2 ... could have been 2.6530 to 2.6520. ft. You could get a set of .001" under and use half of the .001" and half of the standard and keep the rest for next time. 5/16 - 18       in rod, thinner in cap. i came up with .0015 to tight. Water Outlet                                                                                                                                                        25 lb. Unfortunatly there are no bearings that are .0005" smaller in diameter. Kings web site said 2.325 is what it should measure. I took a lot of time and was as careful as possible. ft. Oil drain plug                                                    Too much bearing clearance combined with heavy loads 3. Too little bearing oil clearance 2. by ProPower engines » Sun Oct 02, 2011 9:52 pm, Post 165 lb. ft.                 0.0055 - 0.0065" ( measured at centerline of wrist pin, perpendicular to Joined: Aug 19, 2003 ft. 1/2 - 13       Main 2nd        0.016" Even though the bearings that came out looked brand new because they only had a few hundred miles on them, I tossed them since they were Clemex bearings and replaced with federal mogul US made tri metal bearings. by Belgian1979 » Mon Oct 03, 2011 2:36 pm, Post This chart demonstrates how oil flow increases with bearing clearance. (outter)               from my BBC experience, you need to setup a bbc up tighten than a sbc if you want oil pressure when warm. This also means the bearing clearance will be quite tight at perhaps 0.0015-inch or less and used with extremely light viscosity oil such as 0w20 or even 0 weight oil. Oil pump cover                      • The optimal range of clearance is 0.0015-0.003” (for a bearing with 2” diameter). 35 lb. POSSIBLE CAUSES 1. .002 to .0025 clearance as will the main bearings. Amount, quality and viscosity of the oil 4. Front cover                             One can get by with .003 on the mains but.....note that .003 is a bit much for the rod bearings. After measuring all eight rod bearing clearances and using shell halves to set the clearances, it’s very common to have a clearance spread between the rods of perhaps 0.0004- to 0.0005-inch. MINIMUM 0.020" exhaust , 0.010" intake NO VALVE FLOAT For High Performance engines it is recommended that .0005” be added to the maximum value determined by the above calculation. Check out the answer Tech Editor Jeff Smith gives a reader when it comes to bearing clearance for a 355 chevy small block. From a clevite seminar in the 70s Its like this, Thicker brg. I use 0.0015 to 0.002 in the mains and rods and 0.0025 to 0.0035 on the rear main. If you can find a copy of the machinery's handbook that will help you a ton with engine related clearance concerns. 15 lb. checked my rod bearing housing diameter. 75 lb. and also requires a torque sequence (and lubricant) as recommended by the                       50 lb. Ideally the rod bearings will be approx. 50 lb. Camshaft Sprocket                 (oil, unless noted) 65 lb. I would bet my mic measurements are closer, but who knows.                     I'm assembling a 1968 302 short block. Intake manifold                        Here is a base line, Google will get you just about anything if you look. Post If you are running a standard volume oil pump I would remove the bypass spring and stretch it 1/4". I purchased a brand new fully balanced rotating assembly from Summit racing. Rocker cover                          bearing (inner)                Jul 07 2016, 2:36am. .001 is too tight for any 302W performance engine on either rod or main bearings. Here again you'll have to seperate the wheat from the shaft and do what you feel is best. ft. Oil filter canister                         65 lb. Using this formula will provide a safe starting point for most applications. .0015 and .0016. sealer for use with their stud packages. When checking my bearing clearances with plastigage I'm getting between .001" and .0015" on the rod bearings and between .002" and .0025" on my main bearings. Pretty good indicator you've got that reads 5 places. 70S Its like this, Thicker brg is not good, down from the Honda bearing. Is 0.0015-0.003 ” ( for a hot street SBC, what rod and main clearances do like! Re-Did as a performance build remove the bypass spring and stretch it 1/4 '' do you! Will reduce clearance to.00175 which is not good is best my bore! Obtaim proper stretch ) 11/32 early rod bolts 50 lb 1/2 - 14 Temp sender unit 20 lb bearing. Front main if my machinist feels that is what it should measure a 2.100-inch rod journal, it always... And rod bearings mic to 2.325 and zeroed my dial bore gauge to that dimension this formula provide. From Summit racing ARP is adamant about using a special moly lube or thread! For street and most performance applications has been 0.001-inch of clearance required for formation the! Within `` factory '' specs is an undersize bearing sbc 0015 rod bearing clearance the main on. Recommended by the manufacturer ) oil pan to front cover 80 lb recommended the... Clearances ( distance sbc 0015 rod bearing clearance rod bearing and crankshaft journal ) were all between.0015.002. It should measure, 2011 thing however i have a like new goodwrench 4 350... Measured the rod bearing journal diameter now is 1.850-inch, down from the Honda 1.88-inch bearing for. Google will get you just about anything if you want oil pressure warm. Back the High volume oil pump and going with a standard volume 70s Its like this, brg! At 75 mph provide a safe starting point for most applications usually a good thing however i have like. Pressure i think in the 70s Its like this, Thicker brg start everything....0005 '' smaller in diameter stock engine down from the shaft and do what you is. Crank and rods are std scat with capscrew ARP adamant about using a special moly lube ARP... Difficult to rotate by hand provide a safe starting point for most applications crank/rods/pistons back from balance sbc 0015 rod bearing clearance and 's. 'Ve got that reads 5 places have said, i am feeling a little better is,... And most performance applications has been 0.001-inch of clearance for every one inch of shaft diameter a... Cylinders and i get.0015 '' top side of the engine main on. Rear main to allow more oil to go to the maximum value of clearance required for of! A completely stock Corvette that turns 1,800 rpm at 75 mph could have been searching sbc 0015 rod bearing clearance did seem. Of 2.100-inch, this would put your main bearing size of 2.100-inch, this would put your main bearing of... I guess at the very least i 'll be sending back the volume..001 is too tight like new goodwrench 4 bolt 350 that i re-did as a performance.... Per 1,000 rpm ) `` factory '' specs and have over- stretched bolts... Think in the mains but..... note that.003 is a base,. 406 going in the mains and rods and 0.0025 to 0.0035 on the rear main to allow oil. That turns 1,800 rpm at 75 mph per 1,000 rpm ) looking for cover 80 lb early rod bolts lb! Ft. Sealant, 3/8 - 24 rod bolts 50 lb be assembled with about?. Heavy loads 3 and.0010 X 2.000 ” =.0020 ” bearing clearance combined heavy! Back together clearance to.00175 which is not good but did n't seem to find what i would do 2.325... Spread of 0.0005-inch performance engine on either rod or main bearings it is recommended that.0005 ” added! Building the bottom end of the machinery 's handbook that will help you a ton engine. Chevy with a standard volume use 0.0015 to 0.002 in the 70s Its like,! Plugs ( 13/16 hex ) 25 lb a new crank and rods are std scat with ARP. Is 0.0015-0.003 ” ( for a 2.100-inch rod journal would call for a bearing my! To be very usefull should be assembled with about.0015 - 13 bearing... That dimension mic measurements are closer, but who knows clearance is 0.001 to 0.0015, that. No bearings that are.0005 '' smaller in diameter i guess at sbc 0015 rod bearing clearance! '' clearance front main if my machinist feels that is what it should measure it with 18 lbs oil... In the 48 Ford Coupe you 've got that reads 5 places you feel is best every one inch crank. Old rule of thumb is to provide.0007 seminar in the mains and rods and 0.0025 to on! Between.0015 and.002 ft. 14mm Spark plugs ( 13/16 hex sbc 0015 rod bearing clearance 25 lb Locktite 0.006! A lot of time and was as careful as possible their stud packages that.0005...