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Author Topic:   Chevy block question
James Regier
posted February 15, 2004 06:19 PM
Pre 1972 Ford blocks are supposed to be heavier and stronger then late model blocks.I was wondering if it is the same for chevys. And if so how do you recognize the difference? I'm familiar with the 010 block.What other markings etc.are there to look for? Thanks!

posted February 15, 2004 10:58 PM
The 1 piece rear main seal blocks from 86 - up are all pretty thin. Also, there's 2 piece rear main blocks with the dipstick on the pass. side that were made from 80-85 or so. They're also a little on the thin side.

Anything from '79 back should take a .060" bore if it doesn't have massive core shift or severe rot in the coolant jackets. Not sure about the 60's stuff if it was any thicker.

Ego Racing
posted February 16, 2004 06:18 PM
Also avoid anything with "Hecho de Mexico" (Made in Mexico) in the intake valley. These are not the best. We have had three crack the cylinders when trying to bore 20 over even after a sonic check. It seems to be something about the strength of the Iorn.

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