A easy quick thing to check is this.
Once it gets hot enough to start to run ruff pull the 12 volts to the HEI and then crank the motor and listen for a steady speed of cranking thru all the cylinders.
If you hear the cranking rate speed up then you have a valve hanging open once that temp is reached.
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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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