600hp 390
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Junior User
Joined: Feb 2003
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From: st francis WI
600hp 390
is it possible to build a 600hp 390 that runs on pump gas? Hot Rod built a 450 horse that will run on 87 octane so i would thik it would be very possible to up the compression, bigger cam etc.
and achieve that mark. naturally aspirated of course.
any thought on what it might take to hit that mark?
btw it will be going into a 67 Galaxie 500 4 door
thanks
matt
and achieve that mark. naturally aspirated of course.
any thought on what it might take to hit that mark?
btw it will be going into a 67 Galaxie 500 4 door
thanks
matt
Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
600hp 390
I would think 600 is a stretch for a 390 without NOS or forced induction. Using the same block type, you could build a 427 or stroked 427 (using 428 crank) and go big with the intake, carbs and cam and probably get 600 HP. All you need is $$$$
Post Fiend
Joined: Jan 2003
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From: Iowa
600hp 390
If I wanted 600hp out of a 390, I'd probably use forged pistons, a Crane 343941 cam and enough nitrous oxide to get there. But if you want it to be all motor, then start with a Crane 344561 cam - very radical - and an Edelbrock victor series manifold. You will probably also want Edelbrock aluminum cylinder heads. If you dont think that's enough cam, the Crane 340721 MAY work with their "High intensity" lifters. You will need 93 octane. You would also need a racing torque converter, unless you use a manual transmission. An 850cfm carb would probably be about right, double pumper if used with a manual transmission. I'm not guaranteeing that this will make 600hp, but I think it'd probably get close. Have someone run it through Desktop Dyno 2000. Sounds like fun! 
Post Fiend
Joined: Feb 2001
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From: Missouri
600hp 390
When you are trying to reach 600HP all motor the thing you should most be conerned with is headflow. The edel heads are great but you aren't going to make over 550HP without porting them.. It doesn't matter what cam or intake you throw in there you just aren't going to see any more. 600HP is not as hard as you would think. Wouldn't use a hydraulic cam though. It is gonna require about 7,500rpm which is out of range for that. Some L2291 pistons to give about 10.5:1 compression after the block gets decked and such, a big solid or solid roller cam, Victor FE intake or dove equivalent and some seriously ported edel head and you are there. Runs on pump gas but is in no way streetable.
Post Fiend
Joined: Sep 2000
Posts: 8,238
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From: Oregon
600hp 390
Yes, you can get to 600hp on motor alone with a 390, these guys gave some good advice. But part of the core of the question: Will it run on pump gas? I built a 10:5:1 550hp 390 for my Cougar and its just not happy without race gas or octane boost. It does fine on pump gas and octane boost though. Aviation fuel works good to...actually snapped my home welded wheelie bars with the avia fuel. The bottem line is that current pump gas is absolute crap compared to what we were using 30 years ago, and I just don't believe you will build the motor you want and have it happily run on pump gas. Just my thoughts.
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From: st francis WI
600hp 390
next question how much h.p can stock rods handle? to achieve 600 or even 550 should i look at aftermarket rods? how about rocker shafts and supports. aT what lift should i consider upgrading those? also what kind of numbers are these cams you suggest? lift, duration, etc. i am just trying to assemble as much info as i can before i start to build. i am also going to talk to a machine shop on friday and get his advice. BTW if anyone can recommend a shop near milwaukee , madison WI, or even chicago please do. i will check out everyone.
also ie there a book available on high perormance FE motors?
thanks
matt
also ie there a book available on high perormance FE motors?
thanks
matt
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
600hp 390
Stock rods that are magnafluxed thoroughly, shot peened and polished with ARP wavelock bolts should be alright as long as you keep the RPMs under control. The crower rods would be better but they are $1500 if you can find them. Lemans rods might hold up better also but they are a good bit heavier. The Comp cams 33-782-8 roller is what I would choose. This engine would give you nothing but problems on the street. Keeping it cool would be next to impossible. Could be done but you are going to spend more on getting the chasis and drivetrain ready for it than you will on the engine.
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Post Fiend
Joined: Sep 2000
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From: Oregon
600hp 390
Rat answered your rod question, as far as end stands and shafts go, yes, you will need to replace them. I'd say around 550 lift you need at least stronger end stands. In my opinion, this is a weak spot in the FE and when its built up like you are thinking about I'd replace the shaft and end stands. Rat can tell you all about this.
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Post Fiend
Joined: Feb 2001
Posts: 6,624
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From: Missouri
600hp 390
Seth is right. Stock valvetrain parts are for near stock engines. This is what my 801 cam did to my pushrod when the end broke off of the stock shaft. I had to pull the intake to get it out. I was very lucky it didn't crack my RPM intake. I thought the shaft might have been defective so I replaced it with another stock one. It the other shaft soon broke but I managed to hit the ignition kill before it broke all the way. I got lucky with the second one becasue it started tapping before it broke completely. I run split aluminum stands and hardened shafts from DSC. I have had no problems since the upgrade. I do not run end stands but I think stock shafts and end stands would be just as strong.
Last edited by Ratsmoker; Feb 18, 2003 at 06:42 PM.
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Junior User
Joined: Feb 2003
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From: st francis WI
600hp 390
the drivetrain is up to it. no problem there. i have already broken and upgraded everything do to the 352 currently in there. so ratsmoker, how many ponies do you feel is enough fer the street IE. how much can a streetable 390 put out? and still live on pump gas.
thanks
matt
thanks
matt
Post Fiend
Joined: Feb 2001
Posts: 6,624
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From: Missouri
600hp 390
It all depends on what you want to spend on the rest of the car. With a big radiator and a big electric fan you can get away with quite a bit. Like I said 600HP on the street is not impossible but for most people it is impratical. The only way you are going to be able to legally get that power to the ground is with street slicks. You can figure about $1,000 a year in rubber costs alone. I don't know the real amount (not desktop dyno) of HP I am making but it is very streetable. I do have major traction problems though but I solve this at the strip with slicks.
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
600hp 390
I will when I get back. It will be a rear wheel dyno. I asked a guy in OKC that had a dyno if he could dyno the engine but he said it was not set up for an FE. I am not dynoing the truck to get numbers to brag about though. Dynoing can be very useful in tuning as you will get your Air/Fuel mixture read and you can adjust the jetting accordingly. Mine is a little rich to say the least.
Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
600hp 390
https://www.ford-trucks.com/forums/s...threadid=98307
This is about the only FE RWHP numbers I've seen posted. he is showing 356 RWHP. That's about 415-445 at the crank. Pretty good numbers in my book. Also shows about 450 RWTorque.
I'd bet mine is well below 300 RWHP, even with all of my goodies, but that's probably owner tuning problems :-)
This is about the only FE RWHP numbers I've seen posted. he is showing 356 RWHP. That's about 415-445 at the crank. Pretty good numbers in my book. Also shows about 450 RWTorque.
I'd bet mine is well below 300 RWHP, even with all of my goodies, but that's probably owner tuning problems :-)
Junior User
Joined: Nov 2002
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From: albany ga
600hp 390
while we are on the subject, what is the most hp that ya'll think an FE could produce. i've heard of people dragging them down here in GA, so they must be able to make quite a bit of power.