I have one in the 400 that just came out of the GTO. Engine is a YS 70 400 with 13 heads. Not a bad cam. Runs on 91 up here @6000'. Good power from 2000-4700 rpm. This is with a 4 speed and 3.55 gears. Also got 16MPG on a 500 mile trip running 65-70.
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