1972 Demon with 71 340 casting

Dutchrebuild said

By 72 all 340s had low compression...by all accounts , yours should be low. It has a 72 vin on it...and it's original to your 72 car

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Nope. They did not. This occurred about April 1972. Early 72 engines still had steel cranks and higher compression. The later 72 and 73 engines did not.