I did not deck the block I was told with my motor having 150psi if I had the head milled it would have too much compression I can not find the spec on the 50 hp head to compare 45 sst head too I don't want to run over 93 pump gas
I guess one needs to define "too much compression"...these will run with 200 psi so I assume your definition is of "too much compression" is based on the fuel you are willing to run.
I'm surprised the compression with the 40 head is that high if your block is not decked.
If you have the 50 head measure the pocket depth versus the sst45 spec to get a rough idea of the difference.
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