What is the spec for main bearing clearance

Stang_ROTY · 04-23-2002, 10:20 AM

Well, my main bearings are back in and my engine builder (and I) are very happy that everything looks good inside the engine. My question is...what is spec for main bearing clearance? Right now we are at .006 I pray this is spec. Please comment.

Jeff Chambers · 04-23-2002, 12:48 PM

Could be wrong, but I though SBF main bearing clearance was 0.002-0.0025".

Stang_ROTY · 04-24-2002, 06:45 AM

Hey Jeff! Nice to hear from you again. How's that AOD treating you? Regarding the main bearing clearance, I hope that you are wrong

My engine guy said that anything between .006 & .008 is o.k. Let's hope he's right. Good luck this season.

finj347 · 04-24-2002, 07:32 AM

No way should you run that much bearing clearance. That's just asking for trouble. I was thinking though, are you sure you don't mean crankshaft endplay? If that's the case those are acceptable numbers.

Stang_ROTY · 04-24-2002, 11:32 AM

Yes, I did mean crankshaft endplay. I really need to learn not to rush when posting messages. I read that between .006 and .008 is acceptable for a SBF, which is what you are saying. Thanks.

Quote:

Originally posted by finj347
No way should you run that much bearing clearance. That's just asking for trouble. I was thinking though, are you sure you don't mean crankshaft endplay? If that's the case those are acceptable numbers.

04-23-2002, 10:20 AM	#1
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	What is the spec for main bearing clearance Well, my main bearings are back in and my engine builder (and I) are very happy that everything looks good inside the engine. My question is...what is spec for main bearing clearance? Right now we are at .006 I pray this is spec. Please comment. __________________ Red 1993 GT Street Machine Best E.T. - 12.41/Best MPH = 108 Engine is a 1969 351 block w/393 stroker kit. Dynamic Roller Myte C4, 8 pt cage. Edlebrock Performer heads and Victor Jr. EFI, FRPP 30lb injectors & Cartech fuel system. MSD ignition. Sothside Machine bars & Sub-frames, adj. upper's, 3.73's, Koni rear shocks, much more

04-23-2002, 12:48 PM	#2
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Could be wrong, but I though SBF main bearing clearance was 0.002-0.0025". __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

04-24-2002, 06:45 AM	#3
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	Hey Jeff! Nice to hear from you again. How's that AOD treating you? Regarding the main bearing clearance, I hope that you are wrong My engine guy said that anything between .006 & .008 is o.k. Let's hope he's right. Good luck this season. __________________ Red 1993 GT Street Machine Best E.T. - 12.41/Best MPH = 108 Engine is a 1969 351 block w/393 stroker kit. Dynamic Roller Myte C4, 8 pt cage. Edlebrock Performer heads and Victor Jr. EFI, FRPP 30lb injectors & Cartech fuel system. MSD ignition. Sothside Machine bars & Sub-frames, adj. upper's, 3.73's, Koni rear shocks, much more

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04-24-2002, 07:32 AM	#4
finj347 Registered Member Join Date: Mar 2002 Posts: 3	No way should you run that much bearing clearance. That's just asking for trouble. I was thinking though, are you sure you don't mean crankshaft endplay? If that's the case those are acceptable numbers.