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So that is why Keith Black has a note about these pistons to be carefull when choosing heads, we don't have premium gas anymore. Mine are .024 down in the hole and I am pretty sure I'm running about 9.3
to one compression. I thought I did my homework on these pistons as far as my research goes. I learned more after the rebuild than i did before the rebuild. Considering 2 years ago I couldn't find any pistons with a compression height of 1.932 which is what the stock pistons were that came out. And they are fairly cheap. $329.00 to be exact. If I could do it over again I would work on getting the zero deck height and maybe mill .02 off the 906"s or used the .02 steel head gasket. I wonder if say 84cc's closed chamber or 80cc's heads would work with these pistons? Any idea?


I'm running them with an 80cc Stealth head and have 9.9:1.