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    Noob - Does anyone know the head casting on the 1987 OMC 5.7 GM engine?

    I have inherited at 1987 Glastron-Carlson CVX-23 cruiser and trailer. The engine is locked up, and I don't want to check but almost sure the block is cracked. I have a good rebuilt GM 400 short block, and planning to mate my heads, intake, etc to the existing 400 block, with drilling steam holes...
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