Ref - daily driver '64 Dart /6. Cylinders bored .030 over. Cam unknown, valve job is 2K miles old. 1920 carb being changed out to a Carter BBD with the single barrel manifold cut out mod. Points and condenser may get upgraded to electronic if I don't run out of $. Distributer gives 44 deg. of total vacuum and mechanical advance! I'm doing the poor man's header by cutting the existing header in two and want to shave the head as long as I'm doing intake and exhaust.
First question -> How much dynamic compression can these /6s run on 87 octane gas? I'm reading anything from 8.3-1, to 9.5-1. Any real-world experience out there on compression VS. octane and avoiding the dreaded ping?
Computing dynamic compression -> I have an old dial caliper and ordered a 100cc syringe to cc the combustion chambers with. While waiting for parts, I'm making assumptions and coming up with a dynamic compression of 8.78-1. Seams high for a 'stock' engine... Yes?
*The head base to valve cover surface measures 3.605" ~ 54cc combustion chamber.
*Bore = 3.430", stroke = 4.125"
*TDC to block height = .030", head gasket = 3.520" dia x .040" thick.
*Rod length = 6.699".
*Intake valve closing point (IVC) ~ 42 to 48 deg.
Thanks in advance! I wouldn't even own this car if it weren't for you guys! :steering:
