The Pontiacs usage of a 30 degree Intake seat since day one in 1955 on 99% of the heads wares far less even when the valves and guides are pretty darn loose!
A 30 degree seat clamps to make a seal far more then the wedging action that a 45 degree seat does, especially when a 45 degree set up gets warn and the valve swims around.
This is also the reason a 30 degree seat with a valve like the 2.11" used needs 10 to 12 pounds more seat pressure then a 45 degree seat with the same size valve because a 30 degree seat set up will tend to suffer sealing issues at high rev's more due to valve bounce .
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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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