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i've taken mine (82 f150) up to 4500 in 2nd (i have a granny low, i only use it for towing) 4000 in third and fourth only goes to about 3700. thats where i can get about the best accelleration
I was angry once because my altenator voltage regulator died and i had to get a jump start cause the battery was dead. when i got'er started i reved it to 5400 RPMs and i didnt go any higher. Its not recomended to do that though.
I can't put direct links in yet, because I don't have enough posts. However, using google, typing "building up a six cylinder engine" into the search box and let it search. The 3rd or 4th response should pretty well match the description, and it should be an article from Mustang & Ford magazine. It's a very good read.
It goes into good detail on the Ford inlines, and talks of revving the engines to 7000 RPM.
i once had my 75 f-100 up to 6,000 once, don't plan to do that again usally the power runs out at 4200 so theres no use having it rev any higher than that unless you have a cam etc.
yeah, I'm not sure the engine is an interference, so there isn't a "hard" red line where the valves hit the pistons and blow the motor. But the 4.9 inline is about the closest thing to a diesel that a gas motor will ever get to so think of it like that with the red lines and power numbers. I have the red line on my tach pointing at 4 grand, and taking it up that far is generally unnecessary. I think that the power is dropping off or already has by then.