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post #1 of (permalink) Old 07-08-2001, 10:52 PM
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how to tell 4 bolt in 350

How can I tell if a small block chev has a 4 bolt. does that mean that the bearing caps have 4 bolts holding each down? Thanks

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post #2 of (permalink) Old 07-08-2001, 10:59 PM
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Re: how to tell 4 bolt in 350

Yep, the main bearings have four bolts as opposed to two. Certainly a nice thing to have, but not necessary. A properly prepped 2 bolt block will easily withstand 450 hp.

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post #3 of (permalink) Old 07-08-2001, 10:59 PM
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Re: how to tell 4 bolt in 350

Yes it does, I don't think you can tell from the outside.

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post #4 of (permalink) Old 07-08-2001, 11:48 PM
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Re: how to tell 4 bolt in 350

You can tell by the small embossed emblem on the upper portion of the block at the rear just below where the intake bolts to the block, it will look like the letter "M" somewhat similar to the "double hump" embossing for the cylinder heads. Also a 2 bolt block with splayed caps added is much stronger. The 4 bolt block has 5 main journals but only 3 of them are 4-bolt.

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post #5 of (permalink) Old 07-08-2001, 11:53 PM
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Re: how to tell 4 bolt in 350

Also the 400 cu.in block has the same set up of the three inside caps being four bolt ant the outside caps being two bolt.So if it is important to you to have a 350 block make sure you check closely.

post #6 of (permalink) Old 07-09-2001, 01:26 AM
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Re: how to tell 4 bolt in 350

If the bellhousing bolt hole at the top center of block is threaded, then it's a 4 bolt main. I've yet to see this indicator wrong. There are couple casting #'s that can be either two or four bolt main. Every block casting # that had the top center bellhousing bolt hole threaded turned out to be a 4 bolt main.
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PS, only the 350 and 400 would have had 4 bolt main block.
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post #7 of (permalink) Old 07-09-2001, 05:52 AM
 
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Re: how to tell 4 bolt in 350

You don't really need a 4 bolt block! I don't think 454 ever came with 4 bolt mains but it can still withstand allot of power! Good Luck!

Rodney C
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post #8 of (permalink) Old 07-09-2001, 11:49 AM
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Re: how to tell 4 bolt in 350

The 400 block has one more set of freeze out plugs than the other small block chevies this might help you out a little to determine which you are looking at.

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