Here’s is a Chrysler Engineering dyno test from January 1968 on a GTX/RT 440 4 bbl, ran with full exhaust, air cleaner, vacuum advance, heated intake with riser open, using the production high performance camshaft, AVS carb.

I think some of the confusion on horsepower produced is due to SAE standards back in the day.
One rating is with accessories and exhaust, one without.


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Last edited by Transman; 12/30/20 12:37 PM.