For those who may be curious I just dug out a near virgin set ( like 15'000 miles ) of 6X-4 heads and here's the spring spec.
Intake seat pressure = 115
Exh seat= 110
Intake coil bind=.490"
Exh coil bind= .520"
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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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