What where the main differences between the '71 and '72 Demon?

brian6pac said

10.5 to 8.5 CR, 2.02 to 1.88 intake valves
Forged crank to cast crank

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If you have stock OEM engines. ^^^^^^^ Gonna rebuild the 340,ubild it ilke you want. # 's only count for the guy buying that is a PURIST and can afford it all!