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Old 08-27-2008, 07:42 PM   #1 (permalink)
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visual difference of a 2 bolt and 4 bolt main engine?

does any one know how to tell the difference between a 2 bolt main or a 4 bolt main block?of a 350? for 83's and down
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Old 08-27-2008, 09:33 PM   #2 (permalink)
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Take the oil pan off. The main bearing caps will either have 2 or 4 bolts each.
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Old 08-28-2008, 05:05 AM   #3 (permalink)
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If you can't do that then you have to get the casting numbers and look it up.
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Old 08-28-2008, 12:50 PM   #4 (permalink)
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http://www.mortec.com/castnum.htm

Pretty decent listing.
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Old 08-28-2008, 03:23 PM   #5 (permalink)
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rumor has it that if you have the large 8"(or so) balancer, then its a 4 bolt main, and the smaller is a 2 bolt main. They are swappable, so that really doesnt mean nothing. The same casting number on some blocks is used on a 2 and 4 bolt main applications. If you are shopping for a 4 bolt main, and dont plan on making huge power, I personally think you are wasting your money. Buy a 2 bolt main, argrue its not a 4 bolt, and therefore not worth as much to you, use that as leverage to get the motor cheaper. Build it, enjoy it.
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Old 08-28-2008, 10:29 PM   #6 (permalink)
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Quote:
Originally Posted by filthy Mcchevy View Post
take The Oil Pan Off. The Main Bearing Caps Will Either Have 2 Or 4 Bolts Each.
X2
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Old 08-29-2008, 05:06 AM   #7 (permalink)
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Quote:
Originally Posted by masterbeavis View Post
rumor has it that if you have the large 8"(or so) balancer, then its a 4 bolt main, and the smaller is a 2 bolt main. They are swappable, so that really doesnt mean nothing. The same casting number on some blocks is used on a 2 and 4 bolt main applications. If you are shopping for a 4 bolt main, and dont plan on making huge power, I personally think you are wasting your money. Buy a 2 bolt main, argrue its not a 4 bolt, and therefore not worth as much to you, use that as leverage to get the motor cheaper. Build it, enjoy it.
That is a good point. A 2 bolt block will still hold a lot of power. If you can't find one and really want one, talk to an engine shop about converting a 2 bolt to a 4 bolt.
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Old 08-29-2008, 05:29 PM   #8 (permalink)
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you can also tell by the casting 'for most, not all' at the front by the timing cover, if its thick, its a 4 bolt, if its thinner, its a 2 bolt. kinda hard to explain instead of showing, ill see if i can find a picture
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