Original ones if used on a stock motor should have cast iron exh crossover rivited to the intake by the sheet metal heat sheild.
Also the heat Crossover’s themselves are different between 69 thru 71 and 72.
The repro one have those badly misaligned port exits and the depth of the plenum is not as deep as a original one.
The also means all the runners are not as tall as a original one.
I have heard tell that there is a 5 to 8 hp difference in a original and the repro!
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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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