Yellowbird I agree with you. I failed to mention that it is the 2 bbl 326 9.2:1 low compression engine. 93 octane is the highest octane pump gas you can get, I should be able to run on 87. I believe it's the carbon built in the heads which has raised the compression some. Once again I'm looking for input on the Seafoam treatment for clearing carbon. Someone out there must have expermented with it, it's been around since the 40,s. If I chemically can't clear the carbon I'll pull the heads.