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irish1 · Status: Offline

gt40p heads

Big Frank · Status: Offline

i have gt40ps i use with a b303 cam, air gap intake and a 600cfm carb, with a good launch, right susp and good driving im shure i culd run low 13's, with a little more gear maybe a 3.73-4,.10 geari culd definalty hit 12s,,,89rustang has a similar set up as urs with the eFI and ran low 13s with 3.55s, ik my car is a blast to drive on the street so im happy with it..gt40ps probly add anywhere from 25-40hp out of the box, add some p and p'ing and right right intake and cam. ul be happy, they stop flowing at .500 lift, probly about .520 with some work done to them, for the money, u cant beat em, besdes the header thing, what a pain in the ass

irish1 · Status: Offline

big frank i thank you for your input,i never really find any one using them besides stuff ive found in forums ,so its good to hear that they really work as good as ive heard.

notchstang92 · Status: Offline

You should be good for 280-300 rwhp with that setup. Most h/c/i 302's make around 290-310 rwhp. Put some better gears in the car and you will really see a nice improvement too. You should be happy with that setup though. If guys can go 12's on a stock 302 5 speed with slicks, drag suspension and some weight reduction then you should be somewhere near that.

irish1 · Status: Offline

glad to get the feed back.it should be like two weeks before its ready to turn over,but im liking that you guys think shell put out.like i said for the money that i got into it "poss" hittin 12s,is pretty good.i didnt get into suspension but it all seems pretty tight hopefully that isnt a big disapointment.im acually just getting engine bay ready to get some fresh paint and next week gonna try to drop the motor and tranny in bolt all the top end up. i got my buddy helpin me out so its one of those "get to it when we can"but we're making some good time so far considering work and my second job.thanks guys ........................................

89Rustang · Status: Offline

Whats up,

The GT40p's are probably the best bang for the buck. I love em. They got me into the 13's without the Vortech and I know I could do better if I had traction. If you are going for cheap, the GT40P's are a good choice. One thing you should upgrade on them is the valve springs. If you are going to stay N/A, have them shaved to up the CR.

Also, there are a few people in the 11's with P heads, but they are fully dragged out chassis cars.

9greeNotch3 · Status: Offline

How much do GT40P heads cost alone? and how much to have them ported and what not? Cuz yhe id love to spend $1200 on a set of AFRs but thats way in the future...and im running a carb'd 302 with an e-cam and a weiand stealth intake into a stock holley 600...where would i be powerwise with that setup? i know you guys said around 280 or so...also have 3:73's...leme know thanks

89Rustang · Status: Offline

I'm selling the ones on my car for $200. They have about 1500 miles on em at the most. They are all stock, untouched virgins.

notchstang92 · Status: Offline

9greeNotch3 wrote:

How much do GT40P heads cost alone? and how much to have them ported and what not? Cuz yhe id love to spend $1200 on a set of AFRs but thats way in the future...and im running a carb'd 302 with an e-cam and a weiand stealth intake into a stock holley 600...where would i be powerwise with that setup? i know you guys said around 280 or so...also have 3:73's...leme know thanks

porting depends on how much you want. Also depends on how good the guy porting them is, do they have to take the heads apart and put them back together, do a valve job, etc. CE Racing in Milford could do them I'm sure, not sure what he would want for it. There is also a guy well known on all the mustang boards under the name Nazman. He does a lot of head and intake porting for the mod motor guys and I'm sure he would do your heads. You will not find better port work anywhere. Only problem is he is in Texas so you would have to ship them to him. He did heads/intake for my cobra and the port work is incredible.

9greeNotch3 · Status: Offline

Yeh i know Bob...good guy but expensive as shit...and Mike i might take you up on those heads once im workin again lol...ill let you know

Big Frank · Status: Offline

josh i got a whole explorer motor, gt40 intake(Sold) and everything for 300$ from a local junk yard already pulled, heads were mint had em cleand up and a qucik cutting of the valves, i wuld just upgrade the springs and do an adjust. rocker conversion....ull be happy, trust me, i drove my car yesterday for the 1st time and i culdnt belive for how much money i spend (under 500$) and my car rips, i gotta puttin down at least 260-270rwhp, and im using a junk edlebrock 600cfm, u have an ecam so results maybe a tid differnt, but fairly close....def a good budget head untill u can afford tfs or afrs, i also run an edlebrock airgap intake and a b303 cam

-- Edited by Big Frank at 22:44, 2008-01-31

9greeNotch3 · Status: Offline

yeh i gotta do somethin...soon

Pitbull11 · Status: Offline

gt40p heads are not going to get you close to 300 rwhp. where the hell are you guys coming up with this shit???

89Rustang · Status: Offline

Pitbull11 wrote:

gt40p heads are not going to get you close to 300 rwhp. where the hell are you guys coming up with this shit???

Touche'

93_REEF_NOTCH · Status: Offline

Avg 302 with "P" heads and all the bolt on's you'll see 260-270. Mind you this has to be a well thought out packge.To get 300rwp outta them they'll have to be ported.They just don't have port volume/valve size to allow 300 at the wheels in stock form.

89Rustang · Status: Offline

93_REEF_NOTCH wrote:

Avg 302 with "P" heads and all the bolt on's you'll see 260-270. Mind you this has to be a well thought out packge.To get 300rwp outta them they'll have to be ported.They just don't have port volume/valve size to allow 300 at the wheels in stock form.

Yeah, most are in the 260-280 range. Some even lower. I have seen some exceed 300. Mine was about 280ish according to my old drag slips.

93LX · Status: Offline

i run low 13s on motor with untouched e7s...fuck gt40s wouldnt waste my time. i had a set before but i never put them on cause theyre gay.

Pitbull11 · Status: Offline

Exactly you would be wasting time and money by porting gt40p heads. at that rate your better off with aluminum heads a decent cam, roller rockers and freshen up the lowerend. and to top it off a decent intake. ( Its a weekend project if you have the money.)

AND ANOTHER THING WATCH OUT FOR PEOPLE SELLING 306 MOTORS. ASK THEM QUESTIONS LIKE WHAT CRANK AND RODS ARE IN IT. WHEN THEY SAY STOCK CRANK AND RODS AND BORED .30 OVER THAT IS NOT A REAL 306. THAT IS A FRESHENED UP MOTOR THAT HAD SOME SERIOUS WORN CYLINDER WALLS.

93_REEF_NOTCH · Status: Offline

I'll have to disagree with you Jay. 4.030 bore,3.00 stroke x 8cylinders=306ci

Pitbull11 · Status: Offline

2 weeks ago I put together a 306 Pro x Long rod package. which included a crank, rods, pistons, rings, bearings. which was punched out .30 over but the rods were longer than factory and the crank was much different than factory. all said and done on a dss block. For my customer that is running a vorteck super charger on it. Why would you have to spend for the kit a min of $1100 and $200 in machine work and then another $1400 on a block (which you dont need to do another block.) opposed to $200 in machine work and another $250 in pistons and rings? That to me doesn't sound like a real 306.

89Rustang · Status: Offline

Why would he have built that anyway? Is he running in a cube limited class or something? Long rod 306 = waste of $$ imo if he's not. If you are going to spend all that money on a crank, rods etc, may as well go to a 347.

Pitbull11 · Status: Offline

Granted you guys are building 306 with stock parts, but they are not as reliable as building a complete 306 with the good crank and rods. and especially building a 306 with gt40p heads is a complete waste.

Building a 347 is not always the best way to go. If you are running Fuel Injection. You get better power with a carb on a 347. but he is running a vorteck on his car which needs fuel injection. His 306 is more reliable then most of these 306's you see out there.

By the way I am building a 331 stroker with an iron eagle crank and rods, on a boss 302, with afr heads. and more costing me $7500 in parts . you can spend the same amount to build a good 347 for the same amount and use fuel injection. BUt the price that he paid for his kit and block was well worth the money. The way these are being built is for low compression to run a super charger or turbo or even a lot Of NOS.

-- Edited by Pitbull11 at 12:43, 2008-02-10

93_REEF_NOTCH · Status: Offline

Again, I will disagree Jay. I have yet to see anyone break a factory forged crank or "throw" a factory rod. You'll split the block before any of that happens. Also a 306 is a 306 is a 306...if it's .030 over with a 3.00 stroke...it's a 306. Doesn't matter if crank is forged,cast or made out of butter.

Retro FIVE O · Status: Offline

A stock 302 crank and rod set-up will outlast a stock 5.0L roller cam block. A D.S.S. Block is not any stronger then a stock block because it is a stock block. Putting Forged internals in a stock block is a waste of time! Forged internals belong in the aftermarket blocks.

89Rustang · Status: Offline

Pitbull11 wrote:

Granted you guys are building 306 with stock parts, but they are not as reliable as building a complete 306 with the good crank and rods. and especially building a 306 with gt40p heads is a complete waste.

How is building a 306 with gt40Ps a waste? I ran low 13's with that setup on street tires N/A and it cost me well under $1k. TONS of people put HCI combos on BONE stock 302's. I have seen plenty of Aluminum headed, supercharged, 100K+ mile 302's. I paid ~$400 for my P heads NEW and I couldn't be happier with the $/bang ratio. If I had the dough then, I would have gotten aluminum heads.

I would take a 347 over a BS "long rod" 306 anyday. Especially if I am shelling out $$ for all the internals. I thought the long rod fad was history. They have been disproven over and over. All you do is move the torque curve up in the RPM range.

The whole carb vs EFI thing gets to me. Coke or Pepsi? EFI usually have a broader torque range, carb usually higher peak HP.

I have done too much research on all this shit, lol.

Pitbull11 · Status: Offline

I've pulled many 306 and stock 5.0's apart and have many rods breaking just below the wrist pins on cylinders 4 and 8. Many you guys havent pulled many apart? And a DSS block is built much Stronger than a stock 5.0 block just like the boss 302 and dss are made with thicker cylinders walls. do more research if you don't believe me. That is why I am going with the boss 302 built to hold a turbo or super charger.

That is awesome that you can run a 13 on gt40 heads. But you can run a 13 on stock heads as well. I my self perfer seeing more effert in these 306's that are out there with factory parts.

The other reason why I think gt40p heads are a waste is because you spend all that time putting you car back together because you have a very small budget. But now your car is a fast as the average new camry or accord. Nice!!!!!!!!!!!!!!!

That is my opinion about the heads and the 306's. everyone can have their opinions.

89Rustang · Status: Offline

Pitbull11 wrote:

I've pulled many 306 and stock 5.0's apart and have many rods breaking just below the wrist pins on cylinders 4 and 8. Many you guys havent pulled many apart? And a DSS block is built much Stronger than a stock 5.0 block just like the boss 302 and dss are made with thicker cylinders walls. do more research if you don't believe me. That is why I am going with the boss 302 built to hold a turbo or super charger.

That is awesome that you can run a 13 on gt40 heads. But you can run a 13 on stock heads as well. I my self perfer seeing more effert in these 306's that are out there with factory parts.

The other reason why I think gt40p heads are a waste is because you spend all that time putting you car back together because you have a very small budget. But now your car is a fast as the average new camry or accord. Nice!!!!!!!!!!!!!!!

That is my opinion about the heads and the 306's. everyone can have their opinions.

I'm ready to give up here. Let's go down the list..

DSS blocks are STOCK blocks. Unless you go for their top-of-the-line extreme block which is a BOSS block.

I ran 13's on a fully loaded GT with street radials spinning half way through 2nd, launching from idle. I have seen GT40P headed cars lightened run 11's

Out of the box GT40P>GT40, E7 etc...it's a fact, not opinion. It is well worth the upgrade if it is all you can afford.

LOL @ Camry and Accord. Let's stick to facts. They run high 14's at best.

Pitbull11 · Status: Offline

End this topic and build the motors the way you want and hope they don't break!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Retro FIVE O · Status: Offline

This is getting good!

93_REEF_NOTCH · Status: Offline

Pitbull11 wrote:

I've pulled many 306 and stock 5.0's apart and have many rods breaking just below the wrist pins on cylinders 4 and 8. Many you guys havent pulled many apart? And a DSS block is built much Stronger than a stock 5.0 block just like the boss 302 and dss are made with thicker cylinders walls. do more research if you don't believe me. That is why I am going with the boss 302 built to hold a turbo or super charger.

That is awesome that you can run a 13 on gt40 heads. But you can run a 13 on stock heads as well. I my self perfer seeing more effert in these 306's that are out there with factory parts.

The other reason why I think gt40p heads are a waste is because you spend all that time putting you car back together because you have a very small budget. But now your car is a fast as the average new camry or accord. Nice!!!!!!!!!!!!!!!

That is my opinion about the heads and the 306's. everyone can have their opinions.

As Mike so gratiously mentioned above, a "DSS block" is just a STOCK PRODUCTION FORD BLOCK machined by DSS,cylinder walls are just as Ford cast them..thin as shit. Your are correct that everybody has an opinion but I can't just stand by as people spout out incorrect information. Perhaps you could do more research than reading the glossy ad's in MM & FF.

StangGT350 · Status: Offline

This this is very good..Everyone is fighting about heads an blocks.. i am doin a motor right now i have sumone whos doing my shit an the DSS block is same as they come in a stang from FORD nothing more..he boss is the best thing along with dart but there $$$$$$$$$$$$ so we all make best with what we get put out for $...idk thats me i am not saying i know everything by any means...... Good luck lol

-- Edited by StangGT350 at 14:02, 2008-02-11

89Rustang · Status: Offline

StangGT350 wrote:

This this is very good..Everyone is fighting about heads an blocks.. i am doin a motor right now i have sumone whos doing my shit an the DSS block is same as they come in a stang from FORD nothing more..he boss is the best thing along with drat but there $$$$$$$$$$$$ so we all make best with what we get put out for $...idk thats me i am not saying i know everything by any means......

Good luck lol

BOSS blocks are definately good. I would love to have a Dart or Man O' War though.

93_REEF_NOTCH · Status: Offline

The thing about a Dart or Man-o-War block is the extra machining cost associated with them. It's not like you can spend 2k on the block & start assembling motor. Bang for the buck the Boss wins hands down unless you can pick up used R block, A4 block etc.

89Rustang · Status: Offline

Yup. they come totally raw. But they are sick

StangGT350 · Status: Offline

Yeah the dart block are sick but you like guys are saying alot of money what 2100 for a block another 1000 in work befor you get a R/A in there lol way to much... Beside dart is for big time racing/power Anything more then 500HP

Autoteknix · Status: Offline

Having a dart block is like using a F550 Diesel Dump Truck to bring a couch to the dump! It will definetly do the job, but you'll go broke doing it!
IMO more people should try to split the stock block before they buy an upgraded one!
Heads Make Power Blocks Don't!

93_REEF_NOTCH · Status: Offline

Autoteknix wrote:

Having a dart block is like using a F550 Diesel Dump Truck to bring a couch to the dump! It will definetly do the job, but you'll go broke doing it!
IMO more people should try to split the stock block before they buy an upgraded one!
Heads Make Power Blocks Don't!

Exibit A

89Rustang · Status: Offline

If I know I am gonna make power that will split a stock block, I would cut to the chase and go with an upgraded block(Like Dickie's friend Jimmy). But if I were just going to do a HCI combo for example, a Dart etc would be a huge waste.

Back to GT40P's...good luck with em Frank, I enjoy mine for what I paid. Huge improvement over stock.

irish1 · Status: Offline

hey guys i was the one who brougt up the gt40p question.i loved some of the replies.my question was only if someone had used them and how they like -liked them.i appriciate the guys who gave a trial and error answear.One thing i would like to say is its not a money issue that brought me to use the gt40p heads,if i wanted to buy trick flow heads or afr heads i got no problem buying them.i was doing a low budget build because i alredy had the parts,me and my buddy just decided to put a car togeather and why put the set of stock heads on it if i had the gt40p heads sitting there,and they were better than stock.i spent 100.00 for the gt40ps a ways back upgraded the springs and i would have put new springs in the stock heads anyways,so 100.00 for the set of gt40ps isnt bad.(cheap upgrade thats low budget) i just kinda got the impression that some of the guys that replied thought that i was some broke bum...........directly or indirectly thats how i felt.i asked the question about the heads for knowlage about them not peoples opinnions on if" they were gay or not" just if you had used them and if you noticed a difference or if you were happy with the short money upgrade.im speaking for my self when i say this ,if some one asked me a question looking for helpful advice i wouldnt shoot them down or switch the topic or end someone elses topic ,i would leave it alone or give the best advice i could with facts or information i had heard that may hold some truth.i treat everyone with respect and i really like the web site to get help info so for all the people that gave the good info thanks.......for the guys who mistook the question i had asked read into it a little more next time because forums are to get helpful ,useful info not get scared away because they think there gonna get replies that make them feel like shit.......no harm done and please dont take me the wrong way im not trying to sound like an asshole,i just felt that some guys were getting hit off gaurd because of my question.........didnt want anyone to think i wasnt still interested in the info i asked about

89Rustang · Status: Offline

irish1 wrote:

hey guys i was the one who brougt up the gt40p question.i loved some of the replies.my question was only if someone had used them and how they like -liked them.i appriciate the guys who gave a trial and error answear.One thing i would like to say is its not a money issue that brought me to use the gt40p heads,if i wanted to buy trick flow heads or afr heads i got no problem buying them.i was doing a low budget build because i alredy had the parts,me and my buddy just decided to put a car togeather and why put the set of stock heads on it if i had the gt40p heads sitting there,and they were better than stock.i spent 100.00 for the gt40ps a ways back upgraded the springs and i would have put new springs in the stock heads anyways,so 100.00 for the set of gt40ps isnt bad.(cheap upgrade thats low budget) i just kinda got the impression that some of the guys that replied thought that i was some broke bum...........directly or indirectly thats how i felt.i asked the question about the heads for knowlage about them not peoples opinnions on if" they were gay or not" just if you had used them and if you noticed a difference or if you were happy with the short money upgrade.im speaking for my self when i say this ,if some one asked me a question looking for helpful advice i wouldnt shoot them down or switch the topic or end someone elses topic ,i would leave it alone or give the best advice i could with facts or information i had heard that may hold some truth.i treat everyone with respect and i really like the web site to get help info so for all the people that gave the good info thanks.......for the guys who mistook the question i had asked read into it a little more next time because forums are to get helpful ,useful info not get scared away because they think there gonna get replies that make them feel like shit.......no harm done and please dont take me the wrong way im not trying to sound like an asshole,i just felt that some guys were getting hit off gaurd because of my question.........didnt want anyone to think i wasnt still interested in the info i asked about

Amen dude. I got the P's on a budget and couldn't be happier with them. I have always been the thrifty type wink . If you already have them, I wouldn't hesitate to bolt em on if I were you.

89Rustang · Status: Offline

Also, I know I was saying stuff like "bang for your buck" and "all you can afford" but it was in no way directed to anyone in particular. I am sorry if you thought I meant you personally, irish1. I was just stating that not everyone has the $$ to go out and buy aluminum heads and the GT40P's are a damn good upgrade to E7's if they are looking for more power on the cheap/budget/project whatever. Not a "waste of time".

-- Edited by 89Rustang at 14:49, 2008-02-12

irish1 · Status: Offline

hey dont think i took any of it personal ,ha ha ha .believe me when i said i appriciate the feed back ,it was you and frank i was most thankful towards.the reason i wrote what i did was because you and a few others gave me truth,real trial and error.some just gave oppinions on whats in and whats junk, even if they never used them.thats what i came to bostonstangs for to meet some good guys that would help me out when i needed it .get some good direction and when guys tell you,your doing somthing right it makes you feel that your welcome here......

93_REEF_NOTCH · Status: Offline

My final comment, if you have the money to do Trick Flows or AFR's, why not do them now? We never seem to be happy with the power make so if money allows, your that much more ahead of the curve. .02

irish1 · Status: Offline

hey guys just got enough done on my car today to take it for a quick spin around the block.still have some wires here and there to deal with.of course i need to still get my paint and some more interrior stuff done but shes runnin good.I think the gt40p heads made a pretty noticable difference.....the car pulled so much better and didnt hack up a lung when put to the floor it deffinately was worth the time and effort comparred to stock heads they are well worth it . next motor im gonna do the aluminum heads on and put some money into it, but for now things are good with this set up .

Big Frank · Status: Offline

thats good to hear man, i love the gt40ps, for what i paid for them, i culd not be happier, i wuldnt go as far as porting and polishing them because for that kind of money u culd sell the gt40ps and save a few more bux to buy some nice alum heads, im going to dyno my car this week, im guessing around 270-280rwhp and a decent am ount of torque, hopefully 300ftlbs, we will see and ill let u know how it goes

12second5.0 · Status: Offline

93_REEF_NOTCH wrote:

Again, I will disagree Jay. I have yet to see anyone break a factory forged crank or "throw" a factory rod. You'll split the block before any of that happens. Also a 306 is a 306 is a 306...if it's .030 over with a 3.00 stroke...it's a 306. Doesn't matter if crank is forged,cast or made out of butter.

I agree 100%. I'm still stock bore and stroke and pushing close to 500 rwhp. The only thing I see break stock cranks are spun balancers.........