Cheap GT40x heads, should I buy them

rwhite65 · 11-21-2006, 12:16 AM

Hey guys, some of you know I have been looking for some aluminum heads for a while. I have a set of Gt40 heads (FMS-M-6049-X303) that I can get my hands on for $550.00 or best offer. After looking these up FMS it looks like they might be perfect for my set-up. They are suppose to only have 6,000 miles on them.

Right now, I just have e7's that are nicely home ported. I am not looking for a drag car here, but I am looking for a nice gain in horsepower and weight reduction. With the performance numbers on these heads, would I be stupid to pass this deal up or should I just pay a little extra cash and get some trick flow or edelbrocks?

Keep in mind, my 5.0 is a fresh block and is going to be in there for a while. So buying a head to match a future combination is not an issue right now.

One thing that is holding me back, is the chambers on these are suppose to be 64 cc, and I assume that is gonna lower my compression a little compared to my e7's.

The goal for this car with the current engine, is to get it to run low 13's to high 12's. I have no idea how close I am right now, cause it rained when I was planning on running it.
Ryan

tmoss · 11-21-2006, 10:38 AM

I'd go for it.........

rwhite65 · 11-21-2006, 12:48 PM

Now I am kind of not sure. My buddy that has helped me for years thinks they would not be much of a step up from my ported E7's. He wants me to hold on to my money and get a set of AFR 185's or edelbrock rpm heads. Dilemmas!
Ryan

tmoss · 11-21-2006, 03:52 PM

The X heads flow 250cfm, how could that not be much of a step up? Your heads would flow about 200-210cfm max

rwhite65 · 11-21-2006, 04:26 PM

Tmoss-
I agree with you, he seems to think my heads are ported that good. But if that was the case, I would think everyone would just run the home ported e7's.

tmoss · 11-21-2006, 05:43 PM

230cfm is the most I have ever seen out of ported E7s by a pro..........and 20cfm is significant if you can use it.........

Dark_5.0 · 11-21-2006, 05:58 PM

Tell your friend to put the pipe down. I had super bad @ss ported E7's and picked up exactly 50 RWHP when I switched to the Canfield aluminum heads.

1979bruiser · 11-21-2006, 09:28 PM

buy the heads and enyoy your new power. the gt40s have larger valves, port volume, and less weight. it would be a good choice

johnwb · 11-21-2006, 10:11 PM

My car is away for the winter now ,and I wouldn't mind trying a set of decent heads.I think our setup is similiar,my e7s are ported and shaved,of course it would be nice to score a set of gt 40s at the junkyard, I would try a set of those i think first.If money grew on trees new afr's would be my choice.

rwhite65 · 11-22-2006, 04:04 PM

Anyone remember the combustion chamber size of the e7 head? How much realistically can I shave the 64 cc gt40x head to get some compression back?
Ryan

tmoss · 11-22-2006, 05:27 PM

down to 58cc - that's what mine are, 58.5cc - smaller if you can maintain p/v clearance.

1979bruiser · 11-22-2006, 05:33 PM

i thought that e7 heads had 64 cc chambers.

tmoss · 11-23-2006, 10:25 AM

all heads have a "spec" cc but they vary if actually cc'd with a burrete.

rwhite65 · 11-24-2006, 01:12 AM

Well, I think the gt40 heads woulda been better then mine. But...I am aggrivated..so I am in the market for some AFR's....or maybe Canfields, or something similar....and not looking back.
Ryan

~The Jester~ · 11-24-2006, 01:55 PM

Check your PMs bro!

Don't forget, you can play with head gasket thickness to get your compression back.

The other thing I don't want you to forget is about your "system." Is your cam/intake gonna like the new heads, or will they work better with what you have?

This is a tough one dude, looking for some links for ya right now..... standby......

We need "the flow chart" that has been posted here 110 times, but I can't find the darn thing...... New computer, lost my bookmarks, long story...

~The Jester~ · 11-24-2006, 01:59 PM

Not the one I was looking for, but this might help:

http://www.bronco.com/cms/node/46

1979bruiser · 11-24-2006, 05:52 PM

here is the head frow chart

http://216.239.59.104/search?q=cache...&ct=clnk&cd=20

may have to copy and paste it

11-21-2006, 12:16 AM	#1
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Cheap GT40x heads, should I buy them Hey guys, some of you know I have been looking for some aluminum heads for a while. I have a set of Gt40 heads (FMS-M-6049-X303) that I can get my hands on for $550.00 or best offer. After looking these up FMS it looks like they might be perfect for my set-up. They are suppose to only have 6,000 miles on them. Right now, I just have e7's that are nicely home ported. I am not looking for a drag car here, but I am looking for a nice gain in horsepower and weight reduction. With the performance numbers on these heads, would I be stupid to pass this deal up or should I just pay a little extra cash and get some trick flow or edelbrocks? Keep in mind, my 5.0 is a fresh block and is going to be in there for a while. So buying a head to match a future combination is not an issue right now. One thing that is holding me back, is the chambers on these are suppose to be 64 cc, and I assume that is gonna lower my compression a little compared to my e7's. The goal for this car with the current engine, is to get it to run low 13's to high 12's. I have no idea how close I am right now, cause it rained when I was planning on running it. Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored Last edited by rwhite65; 11-21-2006 at 12:44 AM..

11-21-2006, 10:38 AM	#2
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	Re: Cheap GT40x heads, should I buy them I'd go for it......... __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

11-21-2006, 12:48 PM	#3
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: Cheap GT40x heads, should I buy them Now I am kind of not sure. My buddy that has helped me for years thinks they would not be much of a step up from my ported E7's. He wants me to hold on to my money and get a set of AFR 185's or edelbrock rpm heads. Dilemmas! Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

11-21-2006, 03:52 PM	#4
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	Re: Cheap GT40x heads, should I buy them The X heads flow 250cfm, how could that not be much of a step up? Your heads would flow about 200-210cfm max __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

11-21-2006, 04:26 PM	#5
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: Cheap GT40x heads, should I buy them Tmoss- I agree with you, he seems to think my heads are ported that good. But if that was the case, I would think everyone would just run the home ported e7's. __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

11-21-2006, 05:43 PM	#6
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	Re: Cheap GT40x heads, should I buy them 230cfm is the most I have ever seen out of ported E7s by a pro..........and 20cfm is significant if you can use it......... __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

11-21-2006, 05:58 PM	#7
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: Cheap GT40x heads, should I buy them Tell your friend to put the pipe down. I had super bad @ss ported E7's and picked up exactly 50 RWHP when I switched to the Canfield aluminum heads. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

11-21-2006, 09:28 PM	#8
1979bruiser Registered Member Join Date: Aug 2006 Location: budds creek md Posts: 100	Re: Cheap GT40x heads, should I buy them buy the heads and enyoy your new power. the gt40s have larger valves, port volume, and less weight. it would be a good choice

11-21-2006, 10:11 PM	#9
johnwb 88lx work in progress Join Date: Jul 2005 Location: canada Posts: 62	Re: Cheap GT40x heads, should I buy them My car is away for the winter now ,and I wouldn't mind trying a set of decent heads.I think our setup is similiar,my e7s are ported and shaved,of course it would be nice to score a set of gt 40s at the junkyard, I would try a set of those i think first.If money grew on trees new afr's would be my choice. __________________ 88lx,4cly body,90 5.0l,e cam,summit headers,holley 650 double,edelbrock performer rpm intake,crane valve springs,e7tes lots of machining,5 speed,3.73s,exhaust flotech,with 2.5"exhaust

11-22-2006, 04:04 PM	#10
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: Cheap GT40x heads, should I buy them Anyone remember the combustion chamber size of the e7 head? How much realistically can I shave the 64 cc gt40x head to get some compression back? Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

11-22-2006, 05:27 PM	#11
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	Re: Cheap GT40x heads, should I buy them down to 58cc - that's what mine are, 58.5cc - smaller if you can maintain p/v clearance. __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

11-22-2006, 05:33 PM	#12
1979bruiser Registered Member Join Date: Aug 2006 Location: budds creek md Posts: 100	Re: Cheap GT40x heads, should I buy them i thought that e7 heads had 64 cc chambers.

11-23-2006, 10:25 AM	#13
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	Re: Cheap GT40x heads, should I buy them all heads have a "spec" cc but they vary if actually cc'd with a burrete. __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

11-24-2006, 01:12 AM	#14
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: Cheap GT40x heads, should I buy them Well, I think the gt40 heads woulda been better then mine. But...I am aggrivated..so I am in the market for some AFR's....or maybe Canfields, or something similar....and not looking back. Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored Last edited by rwhite65; 11-24-2006 at 02:49 AM..

11-24-2006, 01:55 PM	#15
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: Cheap GT40x heads, should I buy them Check your PMs bro! Don't forget, you can play with head gasket thickness to get your compression back. The other thing I don't want you to forget is about your "system." Is your cam/intake gonna like the new heads, or will they work better with what you have? This is a tough one dude, looking for some links for ya right now..... standby...... We need "the flow chart" that has been posted here 110 times, but I can't find the darn thing...... New computer, lost my bookmarks, long story... __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

11-24-2006, 01:59 PM	#16
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: Cheap GT40x heads, should I buy them Not the one I was looking for, but this might help: http://www.bronco.com/cms/node/46 __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

11-24-2006, 05:52 PM	#17
1979bruiser Registered Member Join Date: Aug 2006 Location: budds creek md Posts: 100	Re: Cheap GT40x heads, should I buy them here is the head frow chart http://216.239.59.104/search?q=cache...&ct=clnk&cd=20 may have to copy and paste it

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