Quote:

o deck with a flat top piston will be too much compression for pump gas 91 octane, will need to be around 9.2:1 J heads with 2.02 valves



I built 1 for a friend and it is 10.3-1 with aluminum heads and is doing fine on 91

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4