GT40 Heads
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Senior User
Joined: Jun 2014
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From: Denton, TX
GT40 Heads
I am in the process of tearing apart and going through an 82 351w.
I am going to put in a new cam, new intake, new carb, and new exhaust.
How much benefit would I get from swapping the factory heads out with some gt40 heads?
I don't have the need or the $$ to swap in aluminum heads, I don't need a race truck. I just want to have a little more power. Are they a straight swap?
If I can find the heads for pretty cheap would it be a noticeable gain?
I am going to put in a new cam, new intake, new carb, and new exhaust.
How much benefit would I get from swapping the factory heads out with some gt40 heads?
I don't have the need or the $$ to swap in aluminum heads, I don't need a race truck. I just want to have a little more power. Are they a straight swap?
If I can find the heads for pretty cheap would it be a noticeable gain?
Tuned
Joined: Sep 2005
Posts: 437
Likes: 4
From: SE Missouri
Yes the GT40 heads will be a upgrade of about 25-30 horsepower on there own. As far as bolt on that depends if they came out on a 351 or a 302. If they came out on a 302 you will have to get the head bolt holes drilled out to 1/2", other than that they are bolt on
FTE Legend
Joined: Sep 2003
Posts: 53,957
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From: NY and VA
Some of the guys on the Crown Victoria, Grand Marquis, Marauder, and Towncar site are also using E7TZ heads. The GTs are more effective.
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
The '82 351 if all stock is a low compression smog motor.. about 8.3:1, GT40s will bring that up to about 8.8-9:1 depending what version you get, some had 64cc chambers some had 60cc. These things also flow 25% better than stock so along with a cam and exhaust(the other two big factory original restrictions) you could easily be bolting on 100hp.
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Senior User
Joined: Jun 2014
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From: Denton, TX
Okay that sounds awesome.
Standard Fel Pro gaskets alright?
Also, I am using a C6 with stock torque converter... is that sufficient? Or do I really need to upgrade the TC as well? I would really rather not as this project is getting pretty expensive, haha.
Standard Fel Pro gaskets alright?
Also, I am using a C6 with stock torque converter... is that sufficient? Or do I really need to upgrade the TC as well? I would really rather not as this project is getting pretty expensive, haha.
Fleet Owner
Joined: Mar 2003
Posts: 24,724
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From: Blue Hill Township
Some of the guys on the Crown Victoria, Grand Marquis, Marauder, and Towncar site are also using E7TZ heads. The GTs are more effective.
Postmaster
Joined: Nov 2009
Posts: 4,575
Likes: 5
From: Broken Arrow , OK
The cam companies have TC calculators on their websites. When you go with so much cam the TC needs to be upgraded. I didn't change mine and you can really tell the tranny is fighting the motor.
Postmaster
Joined: Nov 2009
Posts: 4,575
Likes: 5
From: Broken Arrow , OK
The '82 351 if all stock is a low compression smog motor.. about 8.3:1, GT40s will bring that up to about 8.8-9:1 depending what version you get, some had 64cc chambers some had 60cc. These things also flow 25% better than stock so along with a cam and exhaust(the other two big factory original restrictions) you could easily be bolting on 100hp.
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