My compression ratio works out to 10.0 to 1 for the 400, dished pistons, and Ram Air II heads I have.
I'm actually mixing premium and another gasoline to get the octane up to about 98. Runs well on that mix.
1968 400 Coupe, verdoro green, black vinyl top, auto 1969 GTO Judge coupe, Carousel Red, manual 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver), Fire Red, white top, auto 1972 Buick GS Stage 1, Royal Blue, black vinyl top, auto
