HP estimate

Hi, ran a pretty similar combo (408 with RHS X-Heads) with the XR286HR cam, think it was around 450 HP / 450 TQ. Best ET was 11.40 @ 117 mph, 1.57 60ft. To get more out of it the heads and cam should be replaced....what i´m doing at the moment ;-)

It idled ok with the XR-cam around 900 rpm, i´d stay away from the thumpr cam (too much overlap in my opinion due to the low LSA).

Michael