100 1206 Bottom end is a 4 bolt main with a forged crank. The story was when I bought the project that the original owner put all hsi $$ into the motor and had it dynoed at 600 HP but no records exist to confirm this. I probably will not be using this motor in the 58 at least in its present build. I have another small block to build and a Pontiac 400 that might also work well with this truck

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