Quote:
Originally Posted by woj's72lemans
okay so i just bought a 76 pontiac 400 engine that i am aiming to build up for power that will eventually be put into my 72 lemans. now as far as thi motor i heard it is a slug but can be built up. i am looking to bore it .30 over, cam it, headers, edelbrock performer or air gap manifod, and i am just unsure of the ebst way to achieve my goal. please help me ith any information, tips, advice, or part suggestions thank you
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The late model year '75 and all of '76 Pontiac blocks with casting #500557 are NOT a good choice for any kind of build up. As a cost saving measure, the factory cast them thin in the main webbing area and they are prone to breakage, especially when used in a build up application. Any other casting # 400 block is better suited to any kind of hopping up. The casting number can be found on the lip behind the passanger side head. See the attachement.