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Having never done this I can only assume that they must go with a larger fire ring.:shrugs:

The later head gaskets have a better "fire ring" then the older two piece ones. If you have the money you can have a circle cut into the heads for the fire rings to set into. The guys who run these engines in tractor pulls do that trick. It allows for more compression also.

Well at least you didn't burn the head ! I have seen burn marks on heads that looked like someone used a torch on it. Your's look like a simple resurfacing will clean them right up.

You can order the compression adapter for the Hercules engines from any White tractor supplier. I bought one just last year for about $80.00 . I cannot remember the model of tractor that uses the same engine as our multifuels but I know JasonS knows ! I think it is something along the lines of a...