390 Fe rpm range.
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390 Fe rpm range.
This summer I swapped a 1970 390 with two barrel carb into my 1979 F-150. My question is what is the max rpm for this engine in stock form? The engine seems that it can pull a little beyond 5000. It looks like the intake was off at one point in time. It runs fine and has a good idle.(possibley stock cam)
There is a flex fan on it. i have heard that these could raise the rpm's a little. I am just curious and hopefully it will have 4 barrel manifold on it this summer. Thanks Nick
There is a flex fan on it. i have heard that these could raise the rpm's a little. I am just curious and hopefully it will have 4 barrel manifold on it this summer. Thanks Nick
Hotshot
Joined: May 2003
Posts: 11,141
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From: south louisiana
somewhere between 6000 and 7000 is about the redline for a stock 390. If it's got a Holley 500 cfm 2bbl, you should have no problem with 6000 rpms. The useful rpm range though is determined by the valve train (cam grind and valve springs)
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Thanks for all of the insight you guys have. i have a feeling that the engine was not originally from the truck that i pulled it out of. i think it was a car or someithng with an automatic due to the fact that it did not have a pilot bearing when i replaced the clutch.
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