3963512 two bolt BB - Team Camaro Tech
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post #1 of 4 (permalink) Old Feb 8th, 07, 07:59 PM Thread Starter
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frank
 
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3963512 two bolt BB

Does anybody know what year GM started making the 454 3963512 2 bolt main blocks?

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post #2 of 4 (permalink) Old Feb 9th, 07, 02:47 AM
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Brian
 
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Re: 3963512 two bolt BB

GM started using the 512 block in 69 (both 2 and 4 bolt) for it's 427s. They started building 454s in 1970, so I assume your answer would be 1970.

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post #3 of 4 (permalink) Old Feb 9th, 07, 11:17 AM
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Thumbs up Re: 3963512 two bolt BB

'512 Blocks started showing up @ Oct. of 1968 used in 427's and had a tall distributor casting boss in the rear of the lifter galley until @ Nov. 1969.
The 454 was released for production in fall of 1969, just before the casting was changed, so check to see if you have a tall (casting date will be on side of block) or short (casting date will be on rear bellhousing flange) distributor boss.

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post #4 of 4 (permalink) Old Feb 9th, 07, 09:58 PM Thread Starter
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Re: 3963512 two bolt BB

Thanks, yes the casting # is on the side of the block. Frank

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