My engine with all of its airflow mods makes peak power at 4600 rpm’s, and that’s with the Comp Cams 49-422-8 cam. Most make there max power around 4600-5000 rpm’s. One major deal with these engines is the Airflow and RPM’s. It has rail type rockers that I used to have Billet aluminum rocker arms made for it, but stopped after quality control and truly never selling more then (8) kits total. The OHV engine is a Torque monster that is based off the old FE engine line, like the 390, 427 and 428. Naturally aspirated it makes 196 rwhp and 254 rwtq. My truck makes 286rwhp and 391 rwtq on a 125 shot (Nitrous). Most with well built engines and ported heads make around 250-275 rwhp. To give you a bit of perspective I only know of one OHV 4.0 like ours that has made over 300 rwhp (Rear Wheel Horsepower) and it has a turbo on it.
The limits of the OHV are more so caused by the poor flow limits of the stock heads and the camshafts.
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