gt40p head users come on in!

5.0kid · Apr 4, 2008

just wondering how many of you are using gt40p heads and what kind of power you guys are making out of them with other mods? i'm thinking they may be the only heads my dad will let me get till i'm out of the house so i may buy a pair soon. tell me your whole combo and hp/tq cause i'm wanting around 300rwhp carbed.

Mr. OAM · Apr 5, 2008

I know a couple (married couple) where the husband ported the crap out of a set of P heads and got some very impressive flow numbers. To the extent that he ported them you would not be able to do it yourself without breaking through a water jacket somewhere. If you take the heads to a really good shop (huge porting reputation) you can get them to flow pretty well. I don't know how much it would cost you though.

Steve

ScottyDsntKnow · Apr 5, 2008

Getting GT40Ps ported to flow anywhere near good aftermarket aluminums will cost at LEAST as much as a new set of said aluminums when all is said and done. Ask me how I know...

At any rate with a properly put together combo and a little diy porting(get a few cartridge rolls and grind off the egr bumps) you'll see probably a little over 275 to the wheels which is enough to get well into the 12s.

The TFS1 or one of the Crane Powermax cams are good cheap OTS bumpsticks to use with these heads. Why carbed?

Stangbangin · Apr 6, 2008

I boast this combo around here alot. Gt40p, Comp XE240r, Trick Flow upper and lower intake. Diy port work on the heads with double springs. 300 hp and 311tq to the wheels.

5.0kid · Apr 6, 2008

i just dont want to mess around with all the computer programming and stuff and wanted to build a carbed engine and learn a little mora about carbs.
im stil trying to get my cam figured out cause i do want it to be a daily and have decent gas milage.

5.0kid · Apr 6, 2008

btw i also want a nice lopey idle if anyone could give me a suggestion about cam. i'm gonig to call comp cams this week and talk to them.

95Grandtouring5.0 · Apr 6, 2008

Just remember, whatever cam you go with, you ought to get a tune.

mrclean302 · Apr 6, 2008

With my stock cam, GT40P and Cobra intake mine made 223hp and 265ft-lb at the wheels.

Mr. OAM · Apr 6, 2008

95Grandtouring5.0 said:
Just remember, whatever cam you go with, you ought to get a tune.

That's the beauty of a carb. Set the idle mixture, set the idle speed, set timing, and off you go. You don't need to go for a tune.

Steve

5.0kid · Apr 6, 2008

yah i will get a tune for the carb. i just talked to my friends aunt and its in better shape than i thought and more expensive than i thought so cam will have to wait a little bit. how hard are they to put in after engine is in the car? i've been reading about it and since i am going to switch it to carb it shouldn't be too bad with taking the lifters out. what type cam does the stock 95 gt have? so i know what to buy. i read roller lifters are reusable which would help a lot. my first step after i buy the car will be to just drive it a little, add exhaust, then to later add the cam and intake this summer and sell all of the efi stuff.

5.0kid · Apr 6, 2008

so when i switch to carb soon after i buy the car should i go ahead and get the gt40p's (175 dollars) and hold off until later to get the aluminum heads? or should i stick to the e7's and get aluminums in a couple years when i'm in college? (dad won't let me get aluminums until then)

Stangbangin · Apr 7, 2008

Well with a carb you can either have good gas mileage or maximum power. Not both. With EFI you can have both.

5.0kid · Apr 7, 2008

well i just don't want to have all the computer crap that has to be tuned every time i do anything to the car. i dont mind getting the worse gas milage just to have the ease of tuning a carb and the less cluttered engine bay.

ScottyDsntKnow · Apr 7, 2008

Stick with FI and buy a AEM or Tweecer and tune it yourself. Takes a little practice but in the end its far and away the best option. Of course you should get a full dyno tune anytime you do something big to your car just to see what kind of power you're making.

5.0kid · Apr 7, 2008

yah well thats another 500-1000 dollars on top of getting a better flowing intake, upper and lower and throttle body and air filter/intake plus the hassle of trying to do it yourself. whereas i have an edelbrock performer rpm manifold and a holley carb already which were less than just a lower intake for the fi setup. then i am going to bet a procomp ignition setup w/ ignition and distributor which will cost about as much as a good upper intake. I just want the ease of not having to do all the computer crap and stuff. plus i want to learn about the carbs more. i know it will get less gas milage but for me i think it is a better deal.

5.0kid · Apr 7, 2008

o yah found out the gt40p heads were sold so i won't be doing that. will probably just do a little porting work to the e7's i have then put them on with cam and carb setup when i have the money. then later on will get some aluminums

ScottyDsntKnow · Apr 7, 2008

Well, its not like there aren't GT40P heads for sale all the time on the Corral. I'd go put a WTB ad up over there and see what happens.

Stangbangin · Apr 8, 2008

5.0kid said:
yah well thats another 500-1000 dollars on top of getting a better flowing intake, upper and lower and throttle body and air filter/intake plus the hassle of trying to do it yourself. whereas i have an edelbrock performer rpm manifold and a holley carb already which were less than just a lower intake for the fi setup. then i am going to bet a procomp ignition setup w/ ignition and distributor which will cost about as much as a good upper intake. I just want the ease of not having to do all the computer crap and stuff. plus i want to learn about the carbs more. i know it will get less gas milage but for me i think it is a better deal.

well if on a budget yea go carb. Carbs are good. I know there's a thread on here right now with a debate of efi over carb and I seem anti carb but I actually think carbs are awesome. I just like efi better.

5.0kid · Apr 14, 2008

just thought i'd ask another question about this car topic i had been questioning. how much worse gas milage do you think i'll get with a 600cfm carb over a typhoon intake and 65mm throttle body?

Stangbangin · Apr 16, 2008

5.0kid said:
just thought i'd ask another question about this car topic i had been questioning. how much worse gas milage do you think i'll get with a 600cfm carb over a typhoon intake and 65mm throttle body?

1 to 2 mpg tops. If its set right it'll be good on gas.