390 help est. hp
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Freshman User
Joined: Mar 2003
Posts: 28
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From: Prague, NE
390 help est. hp
I own a 390 that I run in a 1973 F250 pulling truck. I was curious what everyone thought it should be making for horsepower. Here are some details: 1967 390 out of Galaxy, 428 crank, ARP rod bolts, 410 pistons, heads decked and ported to the max. Upright headers 2" tubes 4"collector. Adjustable rocker arms, Crane cam .601 lift .290 duration, Edelbrock Performer Intake, 2" carb spacer, Demon 850 carb, 1/2" Mallory electric fuel system, Electric fan, water pump, MSD 6AL ignition setup. It runs really hard. I was just curious about guesstimations on hp.
Senior User
Joined: Mar 2003
Posts: 231
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From: Utah
390 help est. hp
It sounds like you could probably benefit from a different intake, try the RPM or the victor, they would match the rest of your setup better. What heads are you using? Valve sizes? Over bore? It also appears that you're after high end horses, instead of low or mid range pulling power. The cam, headers, and carb sound a little big if you're after torque at a reasonable rpm. Without knowing what kind of heads you're running, it's hard to guess hp. I'd say you've got the potential to hit 450 at the flywheel. Hope I helped
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Freshman User
Joined: Mar 2003
Posts: 28
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From: Prague, NE
390 help est. hp
I forgot to add that the block is bored .30, the valves are oversized and the cam is a solid lifter cam. I usually run between 6,000 and 6,500 rpm's. Also I've heard, correct air flow can be a real problem with these engines. Any thoughts?
Last edited by Jamey L. Hanis; Mar 11, 2003 at 01:46 PM.
Post Fiend
Joined: Sep 2000
Posts: 8,238
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From: Oregon
390 help est. hp
Your intake is waaay mismatched for that combo, and really holding you back. Safe to assume the heads have the larger valves and were ported out? Anyways, with that setup, lose that turd of an intake and run the Victor for sure. Assuming your heads were worked, with the right intake, you'd see 450-500 at the fly easy.
Post Fiend
Joined: Feb 2001
Posts: 6,624
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From: Missouri
390 help est. hp
Agreed. The victor would be the ticket if you have enough stall to be at your torque peak as soon as you hit the gas. I think the rest of your combo is pretty sweet though. Give me the following and when I am able to I will run a desktop dyno for ya.
Compression Ratio
Valve Event Specs From the Cam spec card or
All the lobe specs to include the intake centerline.
The performer is good to over 3500 rpm on a mild engine but with the cubes you have and the airflow you require the performer is going to crap out pretty low in the RPM range.
Compression Ratio
Valve Event Specs From the Cam spec card or
All the lobe specs to include the intake centerline.
The performer is good to over 3500 rpm on a mild engine but with the cubes you have and the airflow you require the performer is going to crap out pretty low in the RPM range.
Cargo Master
Joined: Feb 2003
Posts: 2,341
Likes: 5
From: Sacramento
390 help est. hp
Just playing around on Summit's website and noticed the Victor is just over $500 and an Offy port-o-sonic is just over $350. They both have about the same rpm range. I had one on a 429, and it really looked cool!
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