Another part to this that seems to not be considered is if the lesser port volumes ( area ) of the D port heads work better for your particular cid and the way it’s Cam’ed and geared.
Unless the motor is set up for full race and it’s narrow rpm band then it’s the average Tq and HP numbers that matter most .
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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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