Notices

390 help est. hp

 
  #1  
Old 03-11-2003, 12:37 PM
Jamey L. Hanis
Jamey L. Hanis is offline
Freshman User
Thread Starter
Join Date: Mar 2003
Location: Prague, NE
Posts: 28
Jamey L. Hanis is starting off with a positive reputation.
Question 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.
 
  #2  
Old 03-11-2003, 01:11 PM
chissler
chissler is offline
Senior User
Join Date: Mar 2003
Location: Utah
Posts: 231
chissler is starting off with a positive reputation.
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
 
  #3  
Old 03-11-2003, 01:20 PM
Jamey L. Hanis
Jamey L. Hanis is offline
Freshman User
Thread Starter
Join Date: Mar 2003
Location: Prague, NE
Posts: 28
Jamey L. Hanis is starting off with a positive reputation.
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; 03-11-2003 at 01:46 PM.
  #4  
Old 03-11-2003, 01:35 PM
proeliator
proeliator is offline
Post Fiend
Join Date: Sep 2000
Location: Oregon
Posts: 8,238
proeliator is a splendid one to beholdproeliator is a splendid one to beholdproeliator is a splendid one to beholdproeliator is a splendid one to beholdproeliator is a splendid one to beholdproeliator is a splendid one to beholdproeliator is a splendid one to behold
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.
 
  #5  
Old 03-11-2003, 03:20 PM
chissler
chissler is offline
Senior User
Join Date: Mar 2003
Location: Utah
Posts: 231
chissler is starting off with a positive reputation.
390 help est. hp

proeliator nailed it! That performer is good only to about 3,500. You'd be surprised how much that motor would wake up with a victor.
 
  #6  
Old 03-11-2003, 04:28 PM
Ratsmoker's Avatar
Ratsmoker
Ratsmoker is offline
Post Fiend
Join Date: Feb 2001
Location: Missouri
Posts: 6,624
Ratsmoker is starting off with a positive reputation.
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.
 
  #7  
Old 03-14-2003, 08:59 PM
nevrenufhp's Avatar
nevrenufhp
nevrenufhp is offline
Posting Guru
Join Date: Feb 2003
Location: Sacramento
Posts: 2,329
nevrenufhp has a good reputation on FTE.nevrenufhp has a good reputation on FTE.nevrenufhp has a good reputation on FTE.
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!
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
csharris
1967 - 1972 F-100 & Larger F-Series Trucks
39
10-07-2016 08:23 AM
riverguideguy
1973 - 1979 F-100 & Larger F-Series Trucks
5
08-06-2013 10:11 PM
mbenedict
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
2
11-05-2007 04:36 PM
lifted77f250
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
165
08-27-2006 07:21 AM
zsir
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
6
02-14-2003 10:22 AM


Thread Tools
Search this Thread
Quick Reply: 390 help est. hp


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.