4.0 OHV max rpm | Page 2 | Ford Explorer Forums

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4.0 OHV max rpm

The bottom end letting go at that rpm is an anomoly. The bottom end in the SOHC and the ohv are identical. I could go into the history but I don't want to bore you guys.

As far as what RPM to take it to, I bet that engine stops making power around 4700-4900 rpm. Anything higher is just spinning the engine. Good pics, interteresting to say the least.-j
 






Yeah, but that engine with those heads is a high rpm MONSTER. It's just getting started at 5 grand...
 






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