OK I did a search and waded through some very interesting threads on the subject but came to no conclusion only more confusion. I am gathering parts to build an 8.9 to 1 355 SBC. I will be using a set of 416 casting 58cc 305 HO heads with 1.94/1.50 valves, a set of -22cc D-cup pistons and probably a Summit K-1102 cam. I ran this through a DCR calculator and came up with a DCR of 8.16. This will be going in a 4200 Lb. vehicle with a 200-4R OD and 3.73 gears. Question..... can anyone tell me if this DCR is too high to run with 87 or 89 Octane?
My static CR tells me I'd be OK but the DCR seems higher than what I've seen some others post for Satic CR's in this range. I used 2 different calculators and got nearly identical results. Do I need a cam with wider LSA to bring the DCR down? HELP !!!!