Dave, to be honest, I am not that familiar with the H and M distillate models. I know for sure that there is a distillate head and a gasoline head. Not sure if they had different pistons or not.
Now, on the C-113 engine which was the A, B, BN, and C, there absolutely was a piston swap out for the distillate conversion. concave piston tops, lowered compression using the same head for gas or distillate.
so, someone who knows for sure will post and set thing straight. My belief is that the C-113 engine kept the same head but changed the pistons. The H and M I believe kept the pistons, but changed the head.
Those who truly know will correct me or support what I have said.
PS Firecrater pistons will certainly raise the compression, but to do it right, make sure you have the gasoline head as well. I can look up the part numbers for each head, or someone may post it.
This post was edited by Tom Fleming at 17:56:23 12/13/13.
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