Hot Metal said And here's another example of size/spec/hp currently running in the '69RR. 589ci/mega block -13 365cnc Indy heads 2.30/1.88 valves 440-2 Herbert .625/.625"-260/[email protected] 10:1CR, old 950HP DP 2.1/8" TTI step hdrs. View attachment 1715978958 Click to expand...