GT-40P Heads

Haggis13 · September 28th, 2006, 04:41 PM

Anybody installed these on their car? I'm interested in picking up a set, since they flow better than GT-40 heads. I already have the FRPP shorty headers which clear the plug.

I'd like to know about the experience, seat of pant performance, and or dyno differences.

Thanks!

1slo5.0 · September 28th, 2006, 07:06 PM

88 LX hatchback, 5-speed, 3.55 gears, 26x10 slicks, GT40P heads, Explorer intake, everything else stock - 12.86 at 106mph

5-0stank · September 28th, 2006, 10:59 PM

that is quite impressive

1slo5.0 · September 29th, 2006, 03:45 AM

Originally Posted by 5-0stank

that is quite impressive

Possibly but the sad thing is, people are doing that with E7 heads......

Look at some of the NMRA factory stock boys. They put that 12.86 to shame.

5-0stank · September 29th, 2006, 07:39 AM

true...i guess there are so many factors that contribute to one's e.t. other than the power it is making (i.e. suspension, driver, etc.)

88BlueGT · September 29th, 2006, 11:09 AM

^^ Exactally. People really think you need 400rwhp to run 11's. I have seen people run 12's with 230rwhp! Its all about the driver, how the suspension is setup and gears play a big role in it also.

ChrisJ · September 29th, 2006, 11:10 AM

Originally Posted by 88BlueGT

^^ Exactally. People really think you need 400rwhp to run 11's. I have seen people run 12's with 230rwhp! Its all about the driver, how the suspension is setup and gears play a big role in it also.

Very True...

Traction is King...But power helps too...

Paulownian · September 29th, 2006, 12:26 PM

This is the responce I got from Mark at T A Racing about GT-40P heads: "...the GT-40P heads were designed for the Explorer and it is very difficult to find headers that will fit.

The basic GT-40P heads are worth approx 30 HP over stock heads and after porting can add up to 55-60 extra HP.

Early 289 heads can produce over 100 HP over stock."

88BlueGT · September 29th, 2006, 01:00 PM

Um.... hes saying that stock 289 heads can produce over one hundred hp bolted up to a 302 ?!? Um............ GOOD LUCK DEALING WITH THAT GUY!

Paulownian · September 29th, 2006, 01:13 PM

This in a ported condition. I contacted him to consider the porting of my GT-40P heads. His response was to use the 289 heads, instead. If he is wrong, then I would need to ask someone else.

Haggis13 · September 29th, 2006, 01:50 PM

After reading the article about the stock 302 with AFR 165CC heads and 1.7 Rockers adding over 100HP I almost fell out of my seat! Methinks I'm going to go that route - with the motor already blown, I think freeing up the air coming into and out of the cylinder will make my car a screamer! (that and a new intake)

I'll be going out to the track soon and running my car as it is now - with the nice cold air and decent outside temperature here in Ontario I'm hoping to see some decent numbers.

Once I change the heads (next year hopefully depending on $$$) I'll be able to compare it to the Baseline I run this fall.

Paulownian · September 29th, 2006, 01:54 PM

My research is showing great results with porting 289/302 heads. Of course, I'll continue to ask those people who have experience with this type of work.

88BlueGT · September 29th, 2006, 02:47 PM

I believe that test with the AFR's also included a throttle body, MAF and full exhaust... not sure though. Someone might want to check up on that.

Haggis13 · September 29th, 2006, 02:59 PM

Nope - a 625 CFM carb on the one I read.

Still - stock roller cam, rods, crank, pistons and all that jazz with nothing but heads, exhaust and bumped timing running 400+HP is very impressive.

Paulownian · September 29th, 2006, 03:08 PM

A stroker 347 with the correct parts will yield 435hp. Doing a port job on the heads and a proper valve job will yield much, more hp. Throw in a decent set of headers and side pipes, good tranny, and gears to match the type of driving you are going to do and it's dyno time. Could this reach 500hp?? Maybe, maybe not. But it would be fun as hell to try. Take it to a strip, or show, and watch the nay-sayers have to change their minds about the lowly 302 block.

Haggis13 · September 29th, 2006, 03:33 PM

The things we could all do with unlimited funds.

88BlueGT · September 29th, 2006, 03:52 PM

You could hit 500 flywheel hp with a 347... but it would have to be a very aggressive setup.

Paulownian · September 29th, 2006, 03:56 PM

So be it. I don't need that much hp anyway in a FFR kit. 435hp was my original goal.

Haggis13 · September 29th, 2006, 03:58 PM

I think I'd dump the money into a 351 crate motor, or a stroker, based off of a 351 block. The extra cubes would help with not yielding such an aggressively built motor with bad manners.

Paulownian · September 29th, 2006, 04:09 PM

Most of the people who are building FFR's agree on the 351.

September 28th, 2006, 04:41 PM	#1
Haggis13 Enthusiast 1993 Mustang GT Join Date: Sep 2006 Location: Ottawa, Ontario, Canada Posts: 593 iTrader: 0 reviews	GT-40P Heads Anybody installed these on their car? I'm interested in picking up a set, since they flow better than GT-40 heads. I already have the FRPP shorty headers which clear the plug. I'd like to know about the experience, seat of pant performance, and or dyno differences. Thanks! __________________ Bart 93 Black on Black GT Kenne Bell S/C GIVE 'ER!

September 28th, 2006, 07:06 PM	#2
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	88 LX hatchback, 5-speed, 3.55 gears, 26x10 slicks, GT40P heads, Explorer intake, everything else stock - 12.86 at 106mph __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

September 28th, 2006, 10:59 PM	#3
5-0stank Enthusiast Join Date: Sep 2006 Location: emmaus, pa Posts: 508 iTrader: 0 reviews	that is quite impressive __________________ 1995 GT::Sold! Looking for another stang...

September 29th, 2006, 07:39 AM	#5
5-0stank Enthusiast Join Date: Sep 2006 Location: emmaus, pa Posts: 508 iTrader: 0 reviews	true...i guess there are so many factors that contribute to one's e.t. other than the power it is making (i.e. suspension, driver, etc.) __________________ 1995 GT::Sold! Looking for another stang...

September 29th, 2006, 11:09 AM	#6
88BlueGT Regular Join Date: Sep 2006 Location: Hamilton, NJ Posts: 202 iTrader: 0 reviews	^^ Exactally. People really think you need 400rwhp to run 11's. I have seen people run 12's with 230rwhp! Its all about the driver, how the suspension is setup and gears play a big role in it also. __________________ 93 GT - Full Exhaust, 3.90's, Front Tubular Suspension, etc. 88 GT "Big Blue" - Body work & primer!

September 29th, 2006, 12:26 PM	#8
Paulownian Newbie Join Date: Sep 2006 Posts: 39 iTrader: 0 reviews	This is the responce I got from Mark at T A Racing about GT-40P heads: "...the GT-40P heads were designed for the Explorer and it is very difficult to find headers that will fit. The basic GT-40P heads are worth approx 30 HP over stock heads and after porting can add up to 55-60 extra HP. Early 289 heads can produce over 100 HP over stock."

September 29th, 2006, 01:00 PM	#9
88BlueGT Regular Join Date: Sep 2006 Location: Hamilton, NJ Posts: 202 iTrader: 0 reviews	Um.... hes saying that stock 289 heads can produce over one hundred hp bolted up to a 302 ?!? Um............ GOOD LUCK DEALING WITH THAT GUY! __________________ 93 GT - Full Exhaust, 3.90's, Front Tubular Suspension, etc. 88 GT "Big Blue" - Body work & primer!

September 29th, 2006, 01:13 PM	#10
Paulownian Newbie Join Date: Sep 2006 Posts: 39 iTrader: 0 reviews	This in a ported condition. I contacted him to consider the porting of my GT-40P heads. His response was to use the 289 heads, instead. If he is wrong, then I would need to ask someone else.

September 29th, 2006, 01:50 PM	#11
Haggis13 Enthusiast 1993 Mustang GT Join Date: Sep 2006 Location: Ottawa, Ontario, Canada Posts: 593 iTrader: 0 reviews	After reading the article about the stock 302 with AFR 165CC heads and 1.7 Rockers adding over 100HP I almost fell out of my seat! Methinks I'm going to go that route - with the motor already blown, I think freeing up the air coming into and out of the cylinder will make my car a screamer! (that and a new intake) I'll be going out to the track soon and running my car as it is now - with the nice cold air and decent outside temperature here in Ontario I'm hoping to see some decent numbers. Once I change the heads (next year hopefully depending on $$$) I'll be able to compare it to the Baseline I run this fall. __________________ Bart 93 Black on Black GT Kenne Bell S/C GIVE 'ER!

September 29th, 2006, 01:54 PM	#12
Paulownian Newbie Join Date: Sep 2006 Posts: 39 iTrader: 0 reviews	My research is showing great results with porting 289/302 heads. Of course, I'll continue to ask those people who have experience with this type of work.

September 29th, 2006, 02:47 PM	#13
88BlueGT Regular Join Date: Sep 2006 Location: Hamilton, NJ Posts: 202 iTrader: 0 reviews	I believe that test with the AFR's also included a throttle body, MAF and full exhaust... not sure though. Someone might want to check up on that. __________________ 93 GT - Full Exhaust, 3.90's, Front Tubular Suspension, etc. 88 GT "Big Blue" - Body work & primer!

September 29th, 2006, 02:59 PM	#14
Haggis13 Enthusiast 1993 Mustang GT Join Date: Sep 2006 Location: Ottawa, Ontario, Canada Posts: 593 iTrader: 0 reviews	Nope - a 625 CFM carb on the one I read. Still - stock roller cam, rods, crank, pistons and all that jazz with nothing but heads, exhaust and bumped timing running 400+HP is very impressive. __________________ Bart 93 Black on Black GT Kenne Bell S/C GIVE 'ER!

September 29th, 2006, 03:08 PM	#15
Paulownian Newbie Join Date: Sep 2006 Posts: 39 iTrader: 0 reviews	A stroker 347 with the correct parts will yield 435hp. Doing a port job on the heads and a proper valve job will yield much, more hp. Throw in a decent set of headers and side pipes, good tranny, and gears to match the type of driving you are going to do and it's dyno time. Could this reach 500hp?? Maybe, maybe not. But it would be fun as hell to try. Take it to a strip, or show, and watch the nay-sayers have to change their minds about the lowly 302 block.

September 29th, 2006, 03:33 PM	#16
Haggis13 Enthusiast 1993 Mustang GT Join Date: Sep 2006 Location: Ottawa, Ontario, Canada Posts: 593 iTrader: 0 reviews	The things we could all do with unlimited funds. __________________ Bart 93 Black on Black GT Kenne Bell S/C GIVE 'ER!

September 29th, 2006, 03:52 PM	#17
88BlueGT Regular Join Date: Sep 2006 Location: Hamilton, NJ Posts: 202 iTrader: 0 reviews	You could hit 500 flywheel hp with a 347... but it would have to be a very aggressive setup. __________________ 93 GT - Full Exhaust, 3.90's, Front Tubular Suspension, etc. 88 GT "Big Blue" - Body work & primer!

September 29th, 2006, 03:56 PM	#18
Paulownian Newbie Join Date: Sep 2006 Posts: 39 iTrader: 0 reviews	So be it. I don't need that much hp anyway in a FFR kit. 435hp was my original goal.

September 29th, 2006, 03:58 PM	#19
Haggis13 Enthusiast 1993 Mustang GT Join Date: Sep 2006 Location: Ottawa, Ontario, Canada Posts: 593 iTrader: 0 reviews	I think I'd dump the money into a 351 crate motor, or a stroker, based off of a 351 block. The extra cubes would help with not yielding such an aggressively built motor with bad manners. __________________ Bart 93 Black on Black GT Kenne Bell S/C GIVE 'ER!

September 29th, 2006, 04:09 PM	#20
Paulownian Newbie Join Date: Sep 2006 Posts: 39 iTrader: 0 reviews	Most of the people who are building FFR's agree on the 351.

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