four bolt main 350 - Team Camaro Tech
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post #1 of 7 (permalink) Old Jul 25th, 03, 03:45 AM Thread Starter
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Join Date: Feb 2003
Posts: 46

This is going to be the first engine I have ever rebuilt. The engine is in an existing car but I was wondering if there is any way of determining if it is a 4 bolt main without removing the auto trans from it? Probably a stupid question but this is my first rebuild. Thanks.
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post #2 of 7 (permalink) Old Jul 25th, 03, 04:01 AM
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Just pull the oil pan off and look.

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post #3 of 7 (permalink) Old Jul 25th, 03, 06:14 AM
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Really no way to tell unless the engine is sitting in its original application. Even then, it could still be difficult without cracking it open.

I wouldn't worry about trying to find a four bolt block anyway. The majority of the small blocks out there are 2 bolt and they will work just fine in most performance applications.

1969 Camaro - Intense Blue Pearlcoat/white (Baldwin-Motion paint scheme), stock 6.2 liter L92 with VVT, LS3 intake, Doug's Headers; Tremec TKO, 3.73 12-bolt posi.
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post #4 of 7 (permalink) Old Jul 25th, 03, 10:28 AM
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You could pull the oil pan off or you could run the numbers that are stamped on it. These numbers should be close to the carb or cylinder head. this number is really close to the number plating on the carb, intake, and or cylyinder head. if you don't feel like sifting through these numbers, just run the number of the car. This number is either plated on the cowl lid or on the driver side of the dash.
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post #5 of 7 (permalink) Old Jul 25th, 03, 10:36 AM
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Matt Jones
Join Date: Jan 2002
Location: Renton, WA USA
Posts: 2,765

The only reasons I would care if it is a 2 or 4 bolt main is:
1. The sales guy is charging more because he SAYS it's a 4 bolt;
2. I was running a real high HP setup and didn't want to get splayed caps;
3. I was buying a 400 block.

My .02...

Matt Jones
Lead Mechanical Engineer
Art Morrison Ent. Inc.
Silver69Camaro is offline  
post #6 of 7 (permalink) Old Jul 26th, 03, 03:23 PM
Join Date: Dec 2002
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check the casting numbers by the engine mount on the block and refer to an interchange or I.D. manual. Also get the numbers off the stamping pad behind the alternator. Between the two, you should be able to ID the thing as 2/4 bolt as well as original application if not original to the car. If you can't get the book from the library or on the shelf at the parts store, check the net or post them here.
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post #7 of 7 (permalink) Old Jul 26th, 03, 08:58 PM
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The casting number back on the tranny bellhousing area don't mean squat when it comes to the number of main bolts. Either does any number cast into the side of the block. The numbers off by the alternator mounting pad MAY help. Your best bet is to find a engine from a pre-78 pickup or any engine from a 3/4 ton or bigger truck or van. I just recently went thru 8 engines at a salvage yard and without knowing what they came out of, you really can't tell without yanking the pan.
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