Also remember it is an 8 to 1 motor with a very mild factory cam. It is all about low end torque. The high performance W/Z manifolds with dual exhaust will help. Revving much over 4500 rpm is just looking to hurt those big main bearings and do nothing but make noise. Every Olds 455 that came up for sale here were either smog 455's from a big car or were knocking. Enjoy tire smoke!
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