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04-23-2002, 10:20 AM | #1 |
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Join Date: Feb 2001
Location: Berkshire County - Massachusetts
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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.
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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 |
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Could be wrong, but I though SBF main bearing clearance was 0.002-0.0025".
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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 |
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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.
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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 |
04-24-2002, 07:32 AM | #4 |
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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.
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04-24-2002, 11:32 AM | #5 | |
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Join Date: Feb 2001
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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:
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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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