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Old 10-22-2013, 04:13 PM   #1
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Gt40 heads

Decided to go with the gt40 heads. Current mods to my mustang:
Bored to a 306
Aftermarket cam (previous owner told me a b cam with 4.80 lift) ?
75mm throttle body
19lb injectors
Trick Flow upper and lower intake


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Is this a good set to put on? Will I really get 65 hp out of them?
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Old 10-22-2013, 05:43 PM   #2
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The GT40X heads are a great upgrade for an push-rod 5.0. For the cost, you really can't beat the performance gains!

With a 306ci engine like yours, I'd easily expect a 65HP increase (crank). Especially if you're running the B303 camshaft. We made 279rwhp & 317tq with our Stage3 Foxbody, using the same heads, Cobra intake manifold, and E303 camshaft (smaller than B303). I should also note that the car made 194rwhp & 266tq bone stock!

Hope this gives you a better idea how well your Mustang will run, once the heads are upgraded. Let me know if you have any questions!

Shane

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Old 10-22-2013, 05:45 PM   #3
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Awesome thanks!!!
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Old 10-22-2013, 06:23 PM   #4
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Good old gt 40 I'm still running it and a letter cam
The stuff works!
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Old 10-23-2013, 07:22 AM   #5
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You just paid $1100 for GT40 series heads... lol.

You should cancel that order NOW before it ships and get these. Literally better in every single way and not just a little better, like WAY better.
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Old 10-23-2013, 08:31 AM   #6
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You just paid $1100 for GT40 series heads... lol.

You should cancel that order NOW before it ships and get these. Literally better in every single way and not just a little better, like WAY better.
Haven't actually ordered them yet. Ill take a look.
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Old 10-23-2013, 08:42 AM   #7
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Do NOT buy the GT40 heads, not new anyway. Used iron GT40s from a JY for $400-$500 gone through to make them brand new are a great bang for the buck but the aluminums... no... The TFS heads are far FAR and away better heads in every possible way and a lot of room to grow later on if you need them to.

In all honesty you might just want to save up and get the entire TFS top end package all at once. Its $2700 and you get the cam/heads/intake/pushrods/gaskets/rockers...everything.
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Old 10-23-2013, 10:06 AM   #8
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Before the super charger I made 290rwhp with msd a full exhaust and custom tune with an f cam
I'm now running 11psi and make 461rwhp nothing wrong with that all on the ****ty old gt40 turbo swirls lol
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Old 10-23-2013, 01:06 PM   #9
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You'd have made north of 300whp easy with the TFS heads. I'm not saying the GT40s are bad, I'm saying that out of all the quality aluminum heads they make the least power. Hell I was able to make over 300whp with a set of used Edelbrock RPM heads and a $150 used Comp XE cam.

With the price being so close, he'd be stupid to go with the GT40s over the TFS heads.
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Old 10-23-2013, 03:32 PM   #10
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I agree unless you're getting the gts for a killer deal you might as well go tricky I'm just saying hell still make good power

---------- Post added at 03:32 PM ---------- Previous post was at 03:31 PM ----------

And my buddy's trick gli setup only made ten more oh then I did
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Old 10-23-2013, 03:44 PM   #11
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You just paid $1100 for GT40 series heads... lol.

You should cancel that order NOW before it ships and get these. Literally better in every single way and not just a little better, like WAY better.
i'd go with trick flows over gt 40s any day
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Old 10-23-2013, 06:54 PM   #12
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Thanks for your input guys. Not a mechanic here just a dumb electrician lol
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Old 10-23-2013, 06:56 PM   #13
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No problem that is what the forum is here for. Although next time just google search "best 5.0 heads" and you will get a bazillion threads from a dozen different forums.
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Old 10-23-2013, 07:33 PM   #14
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Yeah Trickflows are way better. If you're on a budget, some used GT40's aren't bad like Scotty said, but you'll definitely see more gains and have more room to grow with Trickflow.
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Old 10-24-2013, 09:06 PM   #15
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No problem that is what the forum is here for. Although next time just google search "best 5.0 heads" and you will get a bazillion threads from a dozen different forums.
Thanks dude! Appreciate it

---------- Post added at 08:06 PM ---------- Previous post was at 08:04 PM ----------

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Yeah Trickflows are way better. If you're on a budget, some used GT40's aren't bad like Scotty said, but you'll definitely see more gains and have more room to grow with Trickflow.
Thanks for the info definetly gonna look more into it. As for price I noticed the difference between the two is not a lot .
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Old 10-24-2013, 10:28 PM   #16
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Its barely anything and the beauty of the TW 170cc heads is that they have a TON of meat on them to work with for porting. They can be taken out to be big enough for a 408 if you need them to be. Can't do that with a GT40/Edel/AFR head.
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Old 10-25-2013, 08:18 AM   #17
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Yup looked a lot online too last night definetly gonna go with those
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Old 10-25-2013, 08:28 AM   #18
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Awesome! Keep us updated on the progress
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Old 10-25-2013, 08:38 AM   #19
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Yup looked a lot online too last night definetly gonna go with those
order me a pair while ur at it
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Old 10-25-2013, 10:40 AM   #20
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Its barely anything and the beauty of the TW 170cc heads is that they have a TON of meat on them to work with for porting. They can be taken out to be big enough for a 408 if you need them to be. Can't do that with a GT40/Edel/AFR head.
u think these heads would be good on my 347? I have a pretty radical cam. AFM N-81
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Old 10-25-2013, 11:51 AM   #21
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You just paid $1100 for GT40 series heads... lol. You should cancel that order NOW before it ships and get these. Literally better in every single way and not just a little better, like WAY better.
I am seriously considering these to. With a trick flow stage 3 cam and a track heat intake and these heads how much hp would I be making? Also the cai and bigger tb of course
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Old 10-25-2013, 12:13 PM   #22
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u think these heads would be good on my 347? I have a pretty radical cam. AFM N-81
They'd do OK but you'd be better stepping up to a 185cc head or even a 205.

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I am seriously considering these to. With a trick flow stage 3 cam and a track heat intake and these heads how much hp would I be making? Also the cai and bigger tb of course
I have 0 clue because you failed to list the rest of your combo. If its a stock shortblock then the TFS3 cam will be way to big plus not even clear the pistons.
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Old 10-25-2013, 01:52 PM   #23
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I have 0 clue because you failed to list the rest of your combo. If its a stock shortblock then the TFS3 cam will be way to big plus not even clear the pistons.
It's stock as far at the motor goes, what cam would be suitable for a stock 95 5.0 block with HCI listed before? And how much hp can you get out of them?
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Old 10-25-2013, 02:02 PM   #24
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Lol yeah a TFS 3 isn't even something you can put in a stock rotating assy. A "stage 3" or whatever cam is also not necessarily better than a "stage 1 or 2" either, its all in the combo. Honestly the best cam is going to come from Ed Curtis at FTI or Buddy Rawls. They'll grind you up a custom cam specifically for YOUR combo.

But IMO, get the Trick Flow top end kit for a 5.0 motor if you are going to HCI it. $2700 now and worth every penny. Cam in there is a TFS1, and get the street heat intake.

Or just do a simple $600 GT40 iron head and explorer intake swap and then supercharge it for 425whp all day long. Fuel system is going to have to be upgraded for the HCI anyway, at least the injectors will so its really not that much more. Custom dyno tune mandatory with either.
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Old 10-25-2013, 04:21 PM   #25
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Lol yeah a TFS 3 isn't even something you can put in a stock rotating assy. A "stage 3" or whatever cam is also not necessarily better than a "stage 1 or 2" either, its all in the combo. Honestly the best cam is going to come from Ed Curtis at FTI or Buddy Rawls. They'll grind you up a custom cam specifically for YOUR combo. But IMO, get the Trick Flow top end kit for a 5.0 motor if you are going to HCI it. $2700 now and worth every penny. Cam in there is a TFS1, and get the street heat intake. Or just do a simple $600 GT40 iron head and explorer intake swap and then supercharge it for 425whp all day long. Fuel system is going to have to be upgraded for the HCI anyway, at least the injectors will so its really not that much more. Custom dyno tune mandatory with either.
Thanks for the info, I can't afford a supercharger right now, but I defiantly want to go with a all aluminum trick flow HCI, I will also endup painting the block because it needs front and rear main seals and headers
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Old 10-25-2013, 07:19 PM   #26
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Thanks for the info, I can't afford a supercharger right now, but I defiantly want to go with a all aluminum trick flow HCI, I will also endup painting the block because it needs front and rear main seals and headers
A supercharger won't be any more expensive than a HCI and you'll make more power. I do suggest looking at a set of jy gt40s and an explorer intake or at least pricing it out. If funds are limited you can pay $200 for the heads now, buy the spring kit and valve seals next month, the month after get the valve job and assembly done. That'll be at around the $450-$500 range total. Then buy an explorer intake for $100-$150 and then bolt them in with the stock cam in the spring. You won't need a tune right away and you'll pick up a solid 30-40whp. Then do a supercharger/fuel system when funds allow. Say hello to 450whp and stock drivability. This is the route I will take if I get another 94/95 cobra except it'll already have the heads/intake.
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Old 10-25-2013, 07:26 PM   #27
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A supercharger won't be any more expensive than a HCI and you'll make more power. I do suggest looking at a set of jy gt40s and an explorer intake or at least pricing it out. If funds are limited you can pay $200 for the heads now, buy the spring kit and valve seals next month, the month after get the valve job and assembly done. That'll be at around the $450-$500 range total. Then buy an explorer intake for $100-$150 and then bolt them in with the stock cam in the spring. You won't need a tune right away and you'll pick up a solid 30-40whp. Then do a supercharger/fuel system when funds allow. Say hello to 450whp and stock drivability. This is the route I will take if I get another 94/95 cobra except it'll already have the heads/intake.
That sounds like a plan, a still want to pull the whole motor though. Also the trick flow stuff is expensive. What supercharger do you recommend? Paxton, vortech, procharger?
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Old 10-25-2013, 08:07 PM   #28
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A supercharger won't be any more expensive than a HCI and you'll make more power. I do suggest looking at a set of jy gt40s and an explorer intake or at least pricing it out. If funds are limited you can pay $200 for the heads now, buy the spring kit and valve seals next month, the month after get the valve job and assembly done. That'll be at around the $450-$500 range total. Then buy an explorer intake for $100-$150 and then bolt them in with the stock cam in the spring. You won't need a tune right away and you'll pick up a solid 30-40whp. Then do a supercharger/fuel system when funds allow. Say hello to 450whp and stock drivability. This is the route I will take if I get another 94/95 cobra except it'll already have the heads/intake.
What do you think of these Scotty? Good or bad deal?
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Old 10-25-2013, 09:35 PM   #29
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Heads yes if he has receipts and the shop is a good one. Cam you can get all day on the corral for $100. Offer him $550 for the package and go with $100 bills. Money talks.
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Old 10-26-2013, 01:31 PM   #30
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Heads yes if he has receipts and the shop is a good one. Cam you can get all day on the corral for $100. Offer him $550 for the package and go with $100 bills. Money talks.
Yea he has had them up for 3 weeks now so he may take a low ball offer I will call him later, also what's the difference between gt40 and gt40P heads?
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Old 10-26-2013, 07:55 PM   #31
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Yea he has had them up for 3 weeks now so he may take a low ball offer I will call him later, also what's the difference between gt40 and gt40P heads?
A few things... Different spark plug angle and location, valve size. The p heads have the smaller valve size and the spark plug is at a different angle and located more towards the center of the chamber. These require careful selection of headers and possibly a custom spark plug socket. You can properly identify them by looking at the front or back of the casting.... It will either have three vertical bars(GT40) or four(GT40p). Both are great budget heads and have their followers.
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Old 10-27-2013, 09:54 PM   #32
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A few things... Different spark plug angle and location, valve size. The p heads have the smaller valve size and the spark plug is at a different angle and located more towards the center of the chamber. These require careful selection of headers and possibly a custom spark plug socket. You can properly identify them by looking at the front or back of the casting.... It will either have three vertical bars(GT40) or four(GT40p). Both are great budget heads and have their followers.
There's a 5.0 in the shop I work at and it is just lying around, it has a mechanical fan on it and the heads have 4 bars on the front. Does any one know what it could be out of? The intake manifold is much meatier than mine and just says 5.0 V8 on the top of it. I was thinking its out of an explorer because the exhaust headers are bent differently and have heat shields on them.
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Old 10-27-2013, 10:04 PM   #33
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That's a GT40P headed exploder motor. See if they know if its running and see what you can get it for and how many miles are on it.
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Old 10-27-2013, 11:07 PM   #34
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That's a GT40P headed exploder motor. See if they know if its running and see what you can get it for and how many miles are on it.
Yea I will, I doubt they will let me take or buy the whole motor but I think they would let me buy the heads and intake off it. Are the gt40P heads as good as regular gt40's? Or would I be wasting my time? Also will the intake manifold fir under my strut tower brace or would I need a aftermarket one?
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Old 10-28-2013, 08:09 AM   #35
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Intake manifold should fit fine. The P heads are as good as the GT40s but you have to worry about header clearance and also the spark plug angles require custom or 90 degree boots and heat socks on them.

Lots of guys run the P heads though, FRPP headers fit fine on them.
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