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What do you think this engine should make for power numbers?

 
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MufflerBearings69
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Joined: 22 Jul 2007
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1968 Ford Galaxy

PostPosted: Wed Mar 04, 2009 11:19 pm    Post subject: What do you think this engine should make for power numbers? Reply with quote

Ok, so here it is- what do you guys think this setup should make for power?

390 FE
Bore: 4.080”
Stroke: 3.78”
Rods: 6.488”
Heads: C6AE-R (Poor man’s Cobra-Jet), Intake valve: 2.030”, Exhaust valve: 1.560”
Compression: 9.5:1
Cam: 224 deg intake / 234 deg exhaust, .536” / .562” respectively
Intake: Edelbrock Performer RPM
Carb: Holley 770 cfm vacuum secondary
Ignition: MSD Pro-Billet, 6AL
Exhaust: Hooker Headers, 1.75” primaries, ~28” long , 3” collectors, 3” mandrel bent duals with h-pipe, Flowmaster Delta-Flow 40 series

If there is more I forgot let me know. Curious what the realists think this should make vs. what the builder claims…

The builder had suggested 8 degrees timing at idle and 34 degrees total, I am at 16 degrees idle and 34 total but took the car off the road to do the disc brake conversion after a good scare. Thinking of trying to bump it more, somewhere more like 20 base and 38 all in… See how it goes.

Any suggestions or thoughts on changing it up would be good- all brutal constructive criticism is welcome…
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clay
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1972 Chevrolet Nova

PostPosted: Wed Mar 04, 2009 11:31 pm    Post subject: Reply with quote

I'll throw out the first stab - 420 plus or minus 10. All I've ever done with a FE series was stock rebuilds. Mainly what I remember is the stock cast intake is a back killer. Clay
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Wed Mar 04, 2009 11:46 pm    Post subject: Reply with quote

im going to guess 375-400. we just had this conversation with my engine builder about my buddys Galaxie. he wanted to use the 390 but was wanting 500+ HP on motor. Roger (my engine guy) strongly suggested the 460 for that kind of power and the parts needed to get it there.
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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Thu Mar 05, 2009 12:20 am    Post subject: Reply with quote

Yes- first FE I had I swapped on an ancient Holley single plane aluminum intake- when I pulled the iron one and dropped it on the ground everyone in the house came out...

Heck, the aluminum one in its cardboard box was 34 pounds to ship! haha
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Knarley Darley
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PostPosted: Thu Mar 05, 2009 8:42 pm    Post subject: Reply with quote

Sounds like a nice build. I will say 400 at the crank. My older brother has a 67 Hallet flat bottom with a v drive, and a 427 FE with a fairly healthy cam and a stock dual quad manifold with 2 600 carbs. The heads are some factory head that I have no info on, but they are cast iron. We were both in it and we were clocked at 84 MPH which is moving in that old boat with Two lugboys in it. That engine is surprisingly powerful.
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hotrod1
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PostPosted: Wed May 13, 2009 9:43 pm    Post subject: Reply with quote

I will tell you this-- I have done quite a few 428 Fords ( 390 type ) with a mild cam a nd near stock heads-- they do NOT EVEN MAKE 400 HP-- with your 390, it will make something like 350 to 365 if you are lucky- I did a rear nice 390, with a 428 crank and Edelbrock heads- it made 438 HP to give you an example

JOE SHERMAN RACING ENGINES
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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Thu May 14, 2009 3:19 pm    Post subject: Reply with quote

Ive still yet to see the edelbrock heads do much for the money... I think a lot of people are fascinated with them being aluminum...
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af2
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1933 Willys Coupe

PostPosted: Thu May 14, 2009 6:12 pm    Post subject: Reply with quote

If you think about it the 425 HP 427 had 12:1 compession and some good heads at the time. The Eddys are not much more than an aluminum counter part. That is less than 1hp per ci!
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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Thu May 14, 2009 6:43 pm    Post subject: Reply with quote

Look at the cam specs too though... a lot left to be desired.

I'm not trying to say I think or know my FE will make 400- if I had this idea firmly planted I wouldnt have asked- but I have certainly looked at a bunch of setups with Edelbrock FE heads and dont see them being worth the investment...

If/when I ever tear this FE down I want to put one of my heads on a flow bench to see how the Edelbrocks truly compare.
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coppergmc
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PostPosted: Thu May 14, 2009 8:03 pm    Post subject: Reply with quote

What about torque production? A friend of mine had an old Ford truck that had a warmed over 390 in it that had gobs of torque. That old 2 wheel drive truck was really nice. It had a 3 speed on the column and would scat. It just didn't pull all that hard up top. I guess it all depends on what you are building it for. I'd probably build for low and mid range torque and let the high horse power numbers fall where they may.
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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Sat May 16, 2009 4:05 pm    Post subject: Reply with quote

I'm waiting to see what its like with a little bit of gear to work with- as I was driving it around before it was still with the junk light-duty rearend and 2.80:1 gearing... Even so it wasnt too boring Very Happy

I knew it wasnt going to be a screamer at high rpms- I was planning to drive it a lot more than race it so I wanted it to stay in a more sedate rpm range...
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