Merc 420 to 525sc in a Formula 242.
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A little update: The motor is down to the shortblock. The shortblock appears to be in good shape and will be used as-is. The head are another story. Cylinders 1,3,5,7 all had sunk in valves with 3,5 being sunk in at least 1/8th inch. The heads are at the machine shop right now being gone through. I have new oil cooler on the way. I also hope to be installing a hp500 thermostatic oil filter boss. Thats about it for now.
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Like was mentioned on your FB posting... that sucks! Sorry for the unfortunate news. Good thing you pulled it all apart. Fixing is easy. How bad is the crank?
What caused the valves to sink? Were they tulipped?
What caused the valves to sink? Were they tulipped?