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400 blocks with 557 casting numbers have thin main journals Block casting number is 481988 You must login to post comments.
This is for a good used, gm 400 cid bare engine block, (gm casting number 481988, gm group number 0.033) Block casting numberssize casting # yr This block has a casting date of l 18 3 with a pad code of yh and is used in several 1974 74 pontiac vehicles.
Pontiac screwed up earlier with the '65 and '66 blocks giving thin wall casting a go, but after warranty claims went through the roof they abandoned the idea and the 1967 block was one of the beefiest blocks produced
I've seen some '67 blocks at.090 over and the cylinder walls were still decent. To improve the t/a 6.6's durability, pontiac resurrected the pn 481988 block casting for 1978, and so workers could immediately differentiate the pn 481988 block from the pn 500557 on the. Anyone seen this casting number 481988 in a 4 bolt main I'm thinking it's a service replacement block
What can anyone tell me about this It looks like a factory 4 bolt job, as the parting lines, and thrust surfaces match perfectly The original casting number for the early 400 cid pontiac blocks was the 481988 number john mentioned above Late in 1977 pontiac produce 400 blocks with only 3 motor mount holes
All 455 blocks have a 5 hole pattern and will fit pre 70 chassis
So look & verify motor mount holes depending in what chassis you are installing the block in.
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