05-25-2012, 12:05 AM

1bad65

Senior Chief

Join Date: Nov 2006

Location: QueensNY

Posts: 250

Pontiac 400 - Casting Number 500557

I guess there's some truth to what others are saying about the Pontiac 400 blocks with casting number "500557". Have a look at the picture (Left side, midway up), this is what I found after removing the crank tonight. Everything looked great until I turned the block over and heard a thump and something fell on the ground. Good night folks.

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