Oh well those details are quite important then!
What Can are you running?
The cylinder pressure you will have are as big a part as the overall CCs above the piston top.
I assume those 48 casting are 100% redone top to bottom?
The open chamber heads are a tad more prone to pinging and knock with a given level of compression than the earlier chambers and a greater deck clearance only adds some to that chance of problems.
Depending on your cam pick I am not sure that even running a 4.300” wide x .065” tall gasket will drop you down to a safe pump gas friendly compression.
I want to say that if you’re not locked into having to run those 66 Cc 48 castings that you sell them and pick up a set of # 62 castings .
Once again your cam pick is crucial here!
Some folks with top notch tuning skills can get I iron head 10.5 to 1 motor to run fine on todays 94 octane, but your locked into having 94 in your tank or cutting it with race fuel.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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