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Old 06-06-2011, 05:21 PM   #1
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Keep my gt40 tubular or ?

Was looking into upgrading my heads and intake. Currently 306 gt40 iron heads f303 cam 70mm tb. Should I keep my intake and just get heads? Was recommended to a typhoon intake by ppi with there heads. Wanna hear some opinions
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Old 06-06-2011, 05:31 PM   #2
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Man I wouldn't get rid of your real gt40 intake for a typhoon, it maybe a little better but not 400 dollars worth since you already have an aftermarket intake. You could get a intake that was made for the heads you are getting though, that way it is better matched
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Old 06-06-2011, 05:38 PM   #3
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Any idea on a good set of aluminum heads that would compliment my existing intake and cam set up
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Old 06-06-2011, 06:01 PM   #4
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Gt40x are suppose to be like 25hp or so over gt40, you could go with a trickflow head and intake, I've never ran the gt40x , frpp puts them on alot of their long blocks and top end kits though
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Old 06-06-2011, 06:06 PM   #5
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Re: Keep my gt40 tubular or ?

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Any idea on a good set of aluminum heads that would compliment my existing intake and cam set up
Keep the GT40 intake and add a set of AFR 165 aluminum heads.
There is an article (I think on the MM&FF magazine site) where they added a set of the AFR 165's to a mildly modded or mostly stock 5.0 and picked up 100 HP.

Couldn't find that article, but here is one from - AFR
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Old 06-06-2011, 06:16 PM   #6
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I second that afr165 and trickflow 170s are two of the best heads heads to put on a mild to stock 5.0, when you order them alot of the time u can ask for a spring upgrade for like a hundred bucks to get the best outcome with your f cam
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Old 06-06-2011, 08:58 PM   #7
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Currently have 170cc tfs heads on my 5.0 with b cam, weiand stealth intake, and Holley 650dp! 315Rwhp on dynojet
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Old 06-06-2011, 08:59 PM   #8
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Check out the Edelbrock RPM heads!!
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Old 06-07-2011, 02:17 PM   #9
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Re: Keep my gt40 tubular or ?

I've used Edelbrock and Tfs in the past both great heads , but if you go Tfs you may have to change pistons , I did ....... because of the ( Twisted or canted valve layout ) there is piston to valve interference with most cams
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Old 06-07-2011, 02:34 PM   #10
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Also Edelbrock's performer and rpm heads come with 2.02 and 1.90 .... The 1.90 are for stock pistons ! 2.02 you'll have to change or cut pistons
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Old 06-07-2011, 04:25 PM   #11
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I'm looking into the gt40x or afr. I want it to be a bolt on and go affair. Future plans after better heads will be a Paxton supercharger prob low boost 6-10psi that's a ways off though...previous owner suggests keepin it all ford motorsports parts. U guys agree? I'm not tryin to be the fastest guy out there just as much as I can push keeping it reliable
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Old 06-07-2011, 05:58 PM   #12
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Re: Keep my gt40 tubular or ?

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I'm looking into the gt40x or afr. I want it to be a bolt on and go affair. Future plans after better heads will be a Paxton supercharger prob low boost 6-10psi that's a ways off though...previous owner suggests keepin it all ford motorsports parts. U guys agree? I'm not tryin to be the fastest guy out there just as much as I can push keeping it reliable
Sounds like a plan to me.
I think the X heads would be a good choice too.
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Old 06-07-2011, 10:08 PM   #13
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Re: Keep my gt40 tubular or ?

A true GT-40 intake is actually a pretty damn nice intake.

Shop around and get a set of aluminum heads. Most any of them, including the Jegs heads, would be great for your setup....AFR's, Trick Flow, Edelbrock, Holley, Ford "turbo swirl" etc...

-Will
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Old 06-07-2011, 11:43 PM   #14
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I do agree, there ain't never nothing wrong with staying ford, they have some great parts at great prices, you could spend 10k but there will always be somebody faster. I can promise ya though that u will be happy with the outcome
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Old 06-08-2011, 02:46 PM   #15
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Honestly still up in the air a bit at least I'm getting it narrowed down to a few choices. Doing a lot of searching about the web to see what works best out the box seems afr and the twisted wedge get a lot of praise. Anyone here running a f cam like me? My hp goals is to be low to mid 300 at wheels before adding a s/c or bottle. Sum up my setup
306 10-1 comp
Gt40 iron heads
Fender intake
70mm eddy tb w spacer
9mm wires msd coil and dizzy
Shorty headers straight to flowmasters dumped, cats and x or h pipe coming soon cause I prefer a proper exhaust
3:73 rear world class t5 pro 5.0 shifter sum up my drivetrain
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Old 06-08-2011, 06:26 PM   #16
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Re: Keep my gt40 tubular or ?

Quote:
Originally Posted by shakey1378 View Post
Honestly still up in the air a bit at least I'm getting it narrowed down to a few choices. Doing a lot of searching about the web to see what works best out the box seems afr and the twisted wedge get a lot of praise. Anyone here running a f cam like me? My hp goals is to be low to mid 300 at wheels before adding a s/c or bottle. Sum up my setup
306 10-1 comp
Gt40 iron heads
Fender intake
70mm eddy tb w spacer
9mm wires msd coil and dizzy
Shorty headers straight to flowmasters dumped, cats and x or h pipe coming soon cause I prefer a proper exhaust
3:73 rear world class t5 pro 5.0 shifter sum up my drivetrain
You're best bet to hit the horsepower levels you're wanting is going to be a set of either Trick Flow or AFR 165 heads and a good cam (i.e., no Ford alphabet cams). Also with your compression ratio, you will probably be better off with the bottle than you will with a blower.
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Old 06-08-2011, 09:05 PM   #17
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Lets say I go trick flow 170 what cam should I look at. F cam is pretty aggressive what u suggest?
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Old 06-08-2011, 09:10 PM   #18
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Usually with those heads and stock pistons your ok with up to .540 lift cams! I know someone that has those heads with stock pistons and and trick flow stage 2 cam installed straight up dot to dot!
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Old 06-08-2011, 09:16 PM   #19
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My f cam is .512 is the trickflow stage 2 street legal? I know I will be safe with what I have. Although my timing chain and water pump is freshly replaced if it's worthwhile I'd consider a new cam if I'm gunna have the heads off...
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Old 06-08-2011, 09:30 PM   #20
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I know the tfs stage 1 is emissions legal but not sure if the stage 2 would pass the sniffer! I have the tfs twisted wedge heads, stock pistons with a b cam and 1.72 roller rockers which makes that cam .516 lift and I had tons of clearance.
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Old 06-08-2011, 09:36 PM   #21
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I guessing a tfs stage 1 is a little less lift than what I have but is it that much better than the f? If I change cam also I'd definately wanna see a decent change. But if I'm tryin to pass a sniffer I'm probably limited
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Old 06-08-2011, 09:44 PM   #22
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Yeah the stage 1 cam is something like .499/.510 making it a split duration cam and I've been told that 302's benefit greatly from split duration cams!
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Old 06-08-2011, 10:05 PM   #23
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Re: Keep my gt40 tubular or ?

TFS 170's w/ an F cam would run good, sound good, and work GREAT for a budget setup with a supercharger

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Old 06-08-2011, 10:11 PM   #24
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Should I be upsizing injectors with these heads I have 19lb in car now stock fuel pump
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Old 06-08-2011, 10:13 PM   #25
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Re: Keep my gt40 tubular or ?

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Should I be upsizing injectors with these heads I have 19lb in car now stock fuel pump
Might as well go ahead and go with a high pressure 255 pump (you'll need it with nitrous or a blower anyway). I'd advise some 24# injectors for the heads/cam/intake combo.....and 36's-42's for the blower if you go that route

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