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post #1 of 4 (permalink) Old 03-18-13, 07:36 PM Thread Starter
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My 390 GT build

In my shop I have a 68 fairlane GT motor. I'm not trying to build anything to crazy because this motor is temporary until I swap a 460 and a pair of turbos. Right now I'm doing a frame off resto mod on my 70 F350 and funds are running short.

Basically the motor is a fresh rebuild and then the in cab electrical caught fire and has sat for almost 30 years. I fount this donor truck in a back yard on a random drive one day. Paid $500 for the hole truck. I only wanted the hood and some patch panels. I made $300 back on the scrapping the leftovers. Awesome deal.

All engine internals are as good as new. Stock bore with fresh hone. Crank is in perfect shape. Heads have very little buildup. It's already completely torn down and I'm ready to get started.

My plans are...
Lightly port/polish runners
Polish chambers
Install edelbrock RPM air gap.
750 CFM edelbrock
Stock Cam (.438 lift, 256 duration, 37 overlap)
High volume oil pump

I'm not sure what to do from there.
I'm need advice on a good bearing set.
Any thoughts on oil mods that I have heard about in the past that I can't recal..
Maybe adjustable roller rockers.
I don't want to build this on the cheep but I'm trying to keep it affordable.
The 460 will be my over the top build and this motor will end up in a 31 5 window barn find I'm working on talking the owner into selling.

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post #2 of 4 (permalink) Old 03-19-13, 06:30 PM
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Re: My 390 GT build

Your carb is right about where you want it for your setup, if you go with a mild street cam, I'd consider upping your cfm slightly. Carb CFM Calculator

Headers, dual exhaust, at least 2 1/2". As far as bearings, summit racing usually has quality merchandise,

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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post #3 of 4 (permalink) Old 03-21-13, 11:30 AM
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Re: My 390 GT build

I wouldn't go with the 750 carb, ....with what your building as stock as it is...carb formula +120% would only give you a 692 cfm, so a 650 cfm would do just fine. A stock oil pump will give you plenty of lube all trough the engine, and the intake will breathe OK. Just remember....don't expect big power from your engine in such a heavy truck. Just my thoughts,...if you want to use the 460 and dump all your money there, then go VERY cheap on the 390, because as you said it's just temporary, and you don't want to have to keep fixing or tuning the 390. That can get costly!

The edelbrock (AFB) carb is like a GM quadrajet....pull it off the intake and toss it. Go with a Holley.
JUST MY OPINION!! not law or rule of thumb....

PS. CatSkinner's carb calculator gives your engine 390, 6000rpm, 80%VE a cfm between 541 & 677. I would stick with a 650
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post #4 of 4 (permalink) Old 03-21-13, 12:27 PM Thread Starter
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Re: My 390 GT build

I have a 650 sitting on the shelf. Ill try that and see how things go.

I do have headers and an edelbrock air gap that I forgot to mention.

My truck only weighs in at 4,600lbs with me in it.
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