Do you have any stock assembled rods and pistons to see what you have now?
Most 389 and 400s I have worked on check in at .023” to .026”.
421s. 428s and 455s are more like .019, so between all the motors where not talking a big difference.
With a 4.150” bore and a .021” deck your looking at 4.65 CCs or like a 1/4 point change in compression.
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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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