The later engines show reduced BHP figures but its because they started to measure BHP & Torque differently so the figures quoted are not as bad as they sometimes look.
The early engines 68-70 have the 10-10.5 - 1 compression although i'm not sure how well they would do on todays gas, Our gas in england is a little better than yours i believe but still not great.


Quote Originally Posted by vara4 View Post
I like the 1969 - 472 Close chamber heads
those engines were 10.5 to 1 and were about 400 HP with 550 foot pounds of tourqe.