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BigBlocksRule · 08-30-2011, 10:02 PM

Look for 010 and/or 020 under the timing chain cover, they're the better blocks, either 2 or 4 bolt. As long as it's a daily driver and not beat hard, a 2-bolt is fine. If you like driving it like you bought it at Harbor Freight, you best start with a good 4-bolt block. Gotta pull the pan, there are no single 350 castings from this time that tell if it's 2 or 4 bolt other than 400's.

08-30-2011, 10:02 PM	#7
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: 350 blocks Look for 010 and/or 020 under the timing chain cover, they're the better blocks, either 2 or 4 bolt. As long as it's a daily driver and not beat hard, a 2-bolt is fine. If you like driving it like you bought it at Harbor Freight, you best start with a good 4-bolt block. Gotta pull the pan, there are no single 350 castings from this time that tell if it's 2 or 4 bolt other than 400's.