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    ENGINE HELP!! 1978 GM 305 OMC switched with 1987 GM 305 truck block????

    i have a 1978 thundercraft that has a 305 in it with OMC drive. The original block has a crack in cylinder 5. I bought an 87 GM truck 305 block, bored out at 40 over and planned to swap. When i went to put the flywheel from the 78 engine the flywheel hole mount is much larger and the bolts do...
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    Engine swap 305 short block with OMC 800

    I have recently purchased an 1978 18'Thundercraft in great shape. However, I purchased the boat knowing that the previous owner had the engine inspected and water was in Piston #5. Further investigation showed there was a crack in the block. That being said. My question is such; Can I do a...
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