The chart in post 22 shows the same .023” deck height for the RA4 as the other 400s shown have, and in 1970 all the 4 bbl 400 motors are showing the same ,028” head gasket.
But you do have a point about the depth of the valve notches that the motors would have needed since the RA4 heads had far shallower chambers, but then again the 1970 RAIII having a 10.8 compression when the maximum ever seen in print in any 70 or pre 70 Pontiac literature is 10.75 is very suspect to me!
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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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