Intake valves are subject to big temperature swings between there chamber side and valve bowl side to the tune of that change taking place well over 30 times a second at only 4000 rpm.
This produces a thermal swing fatigue that the exh valves do not see, couple this with the fact that a 30 degree seat with a high performance lobe Cam needs more seat pressure then you would think to keep bounce at bay and it’s easy to see why a lot of factory valves that have failed are intake’s
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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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