Best engine upgrade for stock 390? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 5 (permalink) Old 05-30-2004, 10:17 PM Thread Starter
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Best engine upgrade for stock 390?

Just had the c6 rebuilt and upgraded the exhaust in my '67 LTD. I'd like to get a little more out of the 390 but I'm not sure where to start. It is mechanically sound right now and it runs well.

What would be the main upgrade you would make if it were yours? I'm not looking to get 500hp out of this thing, but a little added performance would be nice.

I thought I might start with an Edelbrock intake manifold and new 4bbl carb.

Any thoughts?
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post #2 of 5 (permalink) Old 05-30-2004, 10:47 PM
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Best engine upgrade for stock 390?

If you havn't already, install a nice 2 1/2" dual exhaust system and with the new 4V carb and intake, should be a noticable improvment and a nice start.
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post #3 of 5 (permalink) Old 05-30-2004, 10:55 PM
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Best engine upgrade for stock 390?

well theres a couple of things on a 390 that can be changed out from stock(bolt on that is) to get better performance. ideally youd want to uprade all three areas if possible. 1st being the exhaust manifolds, those cast iron logs suck. if you can find a set of headers for your car do so. now i know your probably thinking headers, oh no! i dont wanna go through that hassle! well as much of a pain in the ass they can be to install, they are well worth it on a FE(thats a 390). 2nd you can upgrade your intake, the edelbrock performer isnt much in the way of perfromance. bout the only advantage to it is the weight savings wich i doubt will mean much to you. that and the fact that you can use a 4bbl carb. the edelbrock performer flows about the same as a stock intake. you'd be better off with a performer rpm, some people belive its overkill because of the advertised 1500 and up rpm range. it will still be fine below that. also it doesnt have the heat riser passages wich could be a problem on a daily driver in cold weather. now you could find an old police intercepter intake or cj intake which are both good stock manifolds. you can find em on ebay from time to time, but will prolly cost you as much as a rpm intake or more so why not go brand new, same performance or better, and prolly cost less. 3rd you could upgrade your ignition, im guessing your still running points. you can upgrade your dizzy, coil, wires, or even put in a msd box. which with out changing intake and exhaust wont show the biggest gains. but will still increase performance, and better gas milage which with todays prices is a good thing!
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post #4 of 5 (permalink) Old 05-31-2004, 11:38 AM
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Best engine upgrade for stock 390?

I was pretty much in the same boat as you when I first got a hold of my '67 Galaxie. It was a completely stock 390 2bbl. If you go too wild, you will need to get a different torque converter for that C6 with a higher stall and you may need to get different gears in the rearend. What gears do you have?

I started out with exhaust. Headers, 2.5" exhaust, an x-pipe, and Flowmaster series 40 mufflers added a lot to this vehicle. I would highly recommend headers if you haven't done them already. I bought Hooker Super Competition headers -- make sure you get the coated version so that they last a long time and don't get corroded. At the time when I purchased my headers, they didn't offer a coated option, so I had them sent to Jet-Hot and had the coating done there.

I think you are on the right track in just shooting for an intake and 4bbl carb. You will be very happy with the improved performance for minimal cost and time needed to make these upgrades.

Oh yeah, don't forget to go with some type of higher-flow air filter (like a K&N), too.

'67 Galaxie | '00 Excursion | '07 Mustang GT
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post #5 of 5 (permalink) Old 06-01-2004, 12:22 AM
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Best engine upgrade for stock 390?

greg add a rpm intake to that combo and youll see a night and day differnce. also put them next to each other and youll see why the rpm is far superior. i will be running a gt manifold on my i wish i had the money to put one on now, but with all the other parts im putting into my 390 i cant afford it at the moment, fe's are expensive to build. i cant wait to drop it in my 62 gal. it also has the slush-o-matic and 3:00-1 gears in the rear pegleg of course. i will have to put a locker in there for sure as my set up will get that one little stock 7 inch tire spinning with ease. i have a 390 30 over, windage tray, hv oil pump, comp cam 268h(with matching springs and lifters) C1AE heads freshly rebuilt, C6AE-G "s" intake manifold, msd 6al box, blaster ss coil, ford electronic dizzy, msd 8.5mm wires, fpa tri-y headers, and road demon 625cfm carb. id go with a 750 but with gas prices i want to try and maintain some milage. i will be putting 2.5" duals with a h-pipe and probably some 50 series flowmasters. dont want it to get annoying driving long distances.

<font size=-1>[ This Message was edited by: westcoastgalaxie on 6/1/04 12:26pm ]</font>
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