I was running 253 rwhp with stock heads and when I installed a ported set of E7's I purchased with a 5-angle valve job and full porting exhaust and intake I re-dynoed with everything else the same I registered 312 rwhp at 400 rpm lower ,5350 rpm. Now when I go to the local track the biggest mistake every 5.0 owner makes is a different cam than stock. Everyone raises the rpm which makes the car low on horsepower for everyday driving. Trash the aftermarket cam and you will improve horsepower and torque. But then the Ford Magazines have been saying this since 1989 but people still buy those cams.
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