[Barry_R]

My mistake on the valves - - I believe they started out at 2.25 but were trimmed to about 2.20 by the time we were done.

I went to 4.25 stroke because bigger is always better. I cannot think of any legitimate reason not to use the most stroke available when the price is the same. Sometimes (actually a lot of times) people get psyched into chasing 2 or 3 horsepower based on cryptic formulae and ratios - - and they leave 20 easy horses on the table.

I don't thiink that the extra CFM would mean much in my application since it flattens out at 6200.

Compression ratio are static no matter what the temperature. Dynamic ratios are a myth - - a simplistic means of predicting cylinder pressures. Actual cylinder pressure are so greatly impacted by so many variables that they defy simple predictive formuale.