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FE Power Forums => FE Technical Forum => Topic started by: Jackal on September 12, 2015, 01:40:53 PM

Title: Rev limit for stock 390?
Post by: Jackal on September 12, 2015, 01:40:53 PM

...particularly for a 4v high CR. Somewhere I got 5800 RPM stuck in my head and now I can't find where I saw that. In searching, I'm seeing everything from 4000-6000 RPM recommended. My guess would be 5500, but wanted to see what ya'll thought about this. Thanks.

Title: Re: Rev limit for stock 390?
Post by: cammerfe on September 12, 2015, 02:14:31 PM

It depends drastically on the history of the 390. Brother Lon bought a '63 Galaxie 500 convertible with a three-on-the-tree. It started out floating the valves on the 390/300 at about 4500. But every time the valves floated the springs took a hit and before long the float was down to a little more than 3000. The warranty fixed it but he was advised that from then on he was on his own.

On the other hand, a 390/385 would go past 6K all day long.

KS

Title: Re: Rev limit for stock 390?
Post by: Drew Pojedinec on September 12, 2015, 08:51:18 PM

4500 is what I limit my stockish engines to.

Title: Re: Rev limit for stock 390?
Post by: Jackal on September 12, 2015, 11:49:39 PM

Thx guys

Title: Re: Rev limit for stock 390?
Post by: Barry_R on September 13, 2015, 05:24:09 AM

We did a stock one on dyno with a cam and an intake swap.  Stock everything else.
Made 331 HP at 4800
No reason for high RPM

Title: Re: Rev limit for stock 390?
Post by: shady on September 13, 2015, 09:09:29 AM

I limit my stock 352 to 5000. goes there effortlessly.