Deciding on heads..please help

dragstang86 · 10-10-2002, 11:07 PM

Im trying to decide what heads to buy. Right now i have gt-40P heads on it. I was thinking about going with the gt-40X heads. How much of a gain do you think ill see? The ford racing catalogs say a 40hp gain for the aluminum gt-40 and a 65hp gain for the gt-40X but doesnt say about the gt-40P's. Im thinking about a 45hp gain? I can get these heads for 1090.00 through my work completely assembled. Is that a good price? Should i go with the 64cc or the 58cc? Or should i go with different heads?

thanks for the help,
bryan

c-4 tranny 3500 stall
306
gt-40p
cobra intake - ported lower
E-cam
70mm throttle body
roller rockers
373's
and all the other bolt ons and stuff

Bluefox91LX · 10-11-2002, 12:12 AM

i dunno man, but name yer price for the gt-40's you got now, i'd gladly take them off yer hands

88workcar · 10-11-2002, 05:04 AM

Just the swap will loose 50lbs. This alone will help. They should be more powerfull. More important than what head, is what you do with it. Their are people running 11.20s - 10. 20s with Gt-40s, GTPs and a few other heads that are suppose to be not as good as others. I run mid 12s with E7s, and it's getting better all the time. I think you will be happy with the X heads.

LX XLR8R · 10-11-2002, 08:27 AM

sounds like you need some AFR 165's..that be my suggested head..or 185's if you plan on reving her a lil higher..

now that i look at your combo if you want to go faster right now then rid your 70mmTB for a stock..youd be surprised..after that save up for a 65mm..70mm is too big for you

chris91LX · 10-11-2002, 09:40 AM

I picked up 80rwhp with box stock Edelbrock 6032's (the new ones), a TFS stage 1 cam, a ported cobra intake and long tubes over my stock setup. I looked at the Ford heads and decided that for the money I'd do better with Edel's or AFR's. I think the 70mm tb is fine if you go with aluminum heads, that's what I'm running right now.

LX XLR8R · 10-11-2002, 10:26 AM

i still say the 70mm is too big..one way to find out..rip her off and see all the tourque you been missing and i gauentee the e303 doesnt have enuff uptop to take advantage of it

dragstang86 · 10-11-2002, 06:32 PM

Thanks for all the help guys. So is 1,090.00 a good price for a complete pair of gt-40x or is about normal? How much are the AFR's and edelbrock's. Which edelbrock would u suggest the performer? And should i go with a 58cc or a 64cc? I dont even know what cc the gt-40p's that i have now are.

In the ford racing catalog they have there gt-40 crate engine with the gt-40x heads and an e303 listed as making 340hp with a 65mm throttle body and headers. I dont know what intake they used but i should be at about that mark. Cause if i got those heads it would be the same engine plus an extra four cubes. Am i right?

thanks for the help

Stang Runner · 10-11-2002, 06:52 PM

I love my AFR heads!!!!!

dragstang86 · 10-11-2002, 07:21 PM

How much did u pay for them and how much of a gain do u get? Should i go with the 165's or the 185's? My car already has good low end cause of the c-4 3500 stall and 373's. Leaving from an idle im at low 1.70's 60fts still spinning. Once i get my rear straight(posi isnt kicking in) i should be able to leave harder and get it in the 1.60's no prob. So should i go with the 185 58cc AFR's? 185's will give it more top end right?

Im at about a 13.2 right now at only 99 mph. And thats with a stock MAF (which i think is holding me back). These heads should put me well in the 12's right? My current mods are on the first post.

Thanks alot for all your help

Rev · 10-11-2002, 08:32 PM

I chose the TFTW heads after a lot of consideration. The TrickFlow heads came with 2.02 intake valves, and were a little cheaper. I did get the TFTW heads pocket ported for a small amount extra (the AFR's wouldn't need it). The TFTW heads have a raised rim that allows use of roller rockers with stock valve covers (saves $150 or so). Either would be good.

Rev

Stang Runner · 10-11-2002, 08:42 PM

I have stock hight valve covers on my 165's...... I had to grind very little to do it tho I dont even have Mass Air bone stock SD still hehe If I can get a 1.7 any thing I bet I would get some nice Et's....

10-10-2002, 11:07 PM	#1
dragstang86 Registered Member Join Date: Sep 2002 Location: baltimore, md Posts: 220	Deciding on heads..please help Im trying to decide what heads to buy. Right now i have gt-40P heads on it. I was thinking about going with the gt-40X heads. How much of a gain do you think ill see? The ford racing catalogs say a 40hp gain for the aluminum gt-40 and a 65hp gain for the gt-40X but doesnt say about the gt-40P's. Im thinking about a 45hp gain? I can get these heads for 1090.00 through my work completely assembled. Is that a good price? Should i go with the 64cc or the 58cc? Or should i go with different heads? thanks for the help, bryan c-4 tranny 3500 stall 306 gt-40p cobra intake - ported lower E-cam 70mm throttle body roller rockers 373's and all the other bolt ons and stuff

10-11-2002, 05:04 AM	#3
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Just the swap will loose 50lbs. This alone will help. They should be more powerfull. More important than what head, is what you do with it. Their are people running 11.20s - 10. 20s with Gt-40s, GTPs and a few other heads that are suppose to be not as good as others. I run mid 12s with E7s, and it's getting better all the time. I think you will be happy with the X heads. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

10-11-2002, 08:27 AM	#4
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	sounds like you need some AFR 165's..that be my suggested head..or 185's if you plan on reving her a lil higher.. now that i look at your combo if you want to go faster right now then rid your 70mmTB for a stock..youd be surprised..after that save up for a 65mm..70mm is too big for you __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

10-11-2002, 09:40 AM	#5
chris91LX Registered Member Join Date: Oct 1998 Location: Suburban Chicago, Hanover Park Posts: 695	I picked up 80rwhp with box stock Edelbrock 6032's (the new ones), a TFS stage 1 cam, a ported cobra intake and long tubes over my stock setup. I looked at the Ford heads and decided that for the money I'd do better with Edel's or AFR's. I think the 70mm tb is fine if you go with aluminum heads, that's what I'm running right now. __________________ My Ford Club http://www.midwestfords.org/ Best time N/A 12.9 @ 107 1.711 60' 125 shot - 12.04 @ 113 1.59 60'

10-11-2002, 10:26 AM	#6
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	i still say the 70mm is too big..one way to find out..rip her off and see all the tourque you been missing and i gauentee the e303 doesnt have enuff uptop to take advantage of it __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

10-11-2002, 12:12 AM	#2
Bluefox91LX Registered Member Join Date: Sep 2002 Posts: 70	i dunno man, but name yer price for the gt-40's you got now, i'd gladly take them off yer hands

10-11-2002, 06:32 PM	#7
dragstang86 Registered Member Join Date: Sep 2002 Location: baltimore, md Posts: 220	Thanks for all the help guys. So is 1,090.00 a good price for a complete pair of gt-40x or is about normal? How much are the AFR's and edelbrock's. Which edelbrock would u suggest the performer? And should i go with a 58cc or a 64cc? I dont even know what cc the gt-40p's that i have now are. In the ford racing catalog they have there gt-40 crate engine with the gt-40x heads and an e303 listed as making 340hp with a 65mm throttle body and headers. I dont know what intake they used but i should be at about that mark. Cause if i got those heads it would be the same engine plus an extra four cubes. Am i right? thanks for the help

10-11-2002, 06:52 PM	#8
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	I love my AFR heads!!!!! __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

10-11-2002, 07:21 PM	#9
dragstang86 Registered Member Join Date: Sep 2002 Location: baltimore, md Posts: 220	How much did u pay for them and how much of a gain do u get? Should i go with the 165's or the 185's? My car already has good low end cause of the c-4 3500 stall and 373's. Leaving from an idle im at low 1.70's 60fts still spinning. Once i get my rear straight(posi isnt kicking in) i should be able to leave harder and get it in the 1.60's no prob. So should i go with the 185 58cc AFR's? 185's will give it more top end right? Im at about a 13.2 right now at only 99 mph. And thats with a stock MAF (which i think is holding me back). These heads should put me well in the 12's right? My current mods are on the first post. Thanks alot for all your help

10-11-2002, 08:32 PM	#10
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	AFR 165/ TFTW I chose the TFTW heads after a lot of consideration. The TrickFlow heads came with 2.02 intake valves, and were a little cheaper. I did get the TFTW heads pocket ported for a small amount extra (the AFR's wouldn't need it). The TFTW heads have a raised rim that allows use of roller rockers with stock valve covers (saves $150 or so). Either would be good. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

10-11-2002, 08:42 PM	#11
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	I have stock hight valve covers on my 165's...... I had to grind very little to do it tho I dont even have Mass Air bone stock SD still hehe If I can get a 1.7 any thing I bet I would get some nice Et's.... __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

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