95 cobra heads?
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95 cobra heads?
hey,
I just bought a 351W with 2,000 mileson it.It has roller rockers and a ford motorsports intake.There is a edelbrock 600 carb on it and hooker headers.The guy I got it from says it has 1995 cobra heads on it.I was wondering did they have 351 cobra's in 95 mustangs and if so are they good heads?
I just bought a 351W with 2,000 mileson it.It has roller rockers and a ford motorsports intake.There is a edelbrock 600 carb on it and hooker headers.The guy I got it from says it has 1995 cobra heads on it.I was wondering did they have 351 cobra's in 95 mustangs and if so are they good heads?
Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
The heads are from a 302, they didn't have 351's on those mustangs. The heads are GT-40 Iron heads, they are a performance head but barely above the stock E7's.
All 289, 302, 351 heads are the same, but the 351 uses 1/2" head bolts, the other two use 7/16ths. Typically, when the heads are used on the 302 or 289, they use a special insert like unit w/ the bolts to match the hole sizes up.
All 289, 302, 351 heads are the same, but the 351 uses 1/2" head bolts, the other two use 7/16ths. Typically, when the heads are used on the 302 or 289, they use a special insert like unit w/ the bolts to match the hole sizes up.
Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
The cobra R was so rare I doubt he has those, and I don't think they used those on the cobra R but I could be wrong.
They used the GT-40 Iron heads on the run of the mill 94-95 cobras (my buddy has a 94). I'm not positive about pre-94 cobras. However, a GT-40 Iron head is a GT-40 Iron head regardless of what motor it came off of.
The GT-40 irons are not a bad head....they're just not all that great either. Put it this way, the stock 302 mustang of the era were rated at 225 hp, with the E7's (also stock on the trucks). The cobra was rated for 240hp w/ the GT-40 Irons, but most people say it's a little under-rated. Generally, the GT-40 Irosn are good for about 30hp over the stock E7's.
They used the GT-40 Iron heads on the run of the mill 94-95 cobras (my buddy has a 94). I'm not positive about pre-94 cobras. However, a GT-40 Iron head is a GT-40 Iron head regardless of what motor it came off of.
The GT-40 irons are not a bad head....they're just not all that great either. Put it this way, the stock 302 mustang of the era were rated at 225 hp, with the E7's (also stock on the trucks). The cobra was rated for 240hp w/ the GT-40 Irons, but most people say it's a little under-rated. Generally, the GT-40 Irosn are good for about 30hp over the stock E7's.
Postmaster
Joined: Jun 2001
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Any chance this was originally a lightning engine, is the block F4TE, they used the gt-40 heads?
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Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Yeah the lightnings used GT-40 Irons as well, but with a 351 instead of a mustang 302 (basically the same head though).
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The GT40 head was first used on a production car for the 93 Mustang Cobra. It had been around for a few years prior to that, though. There was a Motorsport GT40 Crate engine, that served as the basis of the Cobra motor. It was rated at 285 HP, but everyone knew this was a slightly conservative rating, with the B303 cam. Actually, a later GT40 crate motor, using the Cobra cam, was also rated at 285 HP. The Cobra used a milder cam(w/1.73 roller rockers), and a cast version of the GT40 intake. It also still used the stock GT style shorty's too. However, we got 265 horses at the rear wheels from a 93 Cobra motor. We did have on a pair of BBK shorty's though, so that may have been key. The GT40 iron heads were available to the public in pairs and singles prior to 93 too.
I have seen dyno charts that show the stock GT40 heads supporting about 300 HP using otherwise stock 5.0HO's, running E303 cams. This is well short of the TFS-AFR aluminum head bench mark, of 350 HP, on identical short blocks, using E303 cams. Nonetheless, it shows the iron GT40 to be about equal to the Dart Windsor Jr (AKA Rousch head) iron heads, that were popular in the early 90's.
I have seen dyno charts that show the stock GT40 heads supporting about 300 HP using otherwise stock 5.0HO's, running E303 cams. This is well short of the TFS-AFR aluminum head bench mark, of 350 HP, on identical short blocks, using E303 cams. Nonetheless, it shows the iron GT40 to be about equal to the Dart Windsor Jr (AKA Rousch head) iron heads, that were popular in the early 90's.
Last edited by P51D Mustang; Nov 27, 2004 at 01:45 PM.
Cargo Master
Joined: Dec 2003
Posts: 2,735
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From: Sunny Florida
Originally Posted by MustangGT221
The cobra R was so rare I doubt he has those, and I don't think they used those on the cobra R but I could be wrong.
They used the GT-40 Iron heads on the run of the mill 94-95 cobras (my buddy has a 94). I'm not positive about pre-94 cobras. However, a GT-40 Iron head is a GT-40 Iron head regardless of what motor it came off of.
The GT-40 irons are not a bad head....they're just not all that great either. Put it this way, the stock 302 mustang of the era were rated at 225 hp, with the E7's (also stock on the trucks). The cobra was rated for 240hp w/ the GT-40 Irons, but most people say it's a little under-rated. Generally, the GT-40 Irosn are good for about 30hp over the stock E7's.
They used the GT-40 Iron heads on the run of the mill 94-95 cobras (my buddy has a 94). I'm not positive about pre-94 cobras. However, a GT-40 Iron head is a GT-40 Iron head regardless of what motor it came off of.
The GT-40 irons are not a bad head....they're just not all that great either. Put it this way, the stock 302 mustang of the era were rated at 225 hp, with the E7's (also stock on the trucks). The cobra was rated for 240hp w/ the GT-40 Irons, but most people say it's a little under-rated. Generally, the GT-40 Irosn are good for about 30hp over the stock E7's.
Post Fiend
Joined: Nov 2001
Posts: 14,947
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From: Topsfield, MA
Basically what I did, was assume that the 240hp cobra rating is conservative as others have said. So i'll call that 260hp (as what others tend to think it was when new), 260 vs 225 (the 225 was pretty accurate from what i've heard over the years) is a 35hp difference. I took out 5 or so hp for any induction differences between the two motors, and figured 30hp give or take a few is an accurate assessment. It's just my judgement based on my experiences over the years. The only real way to know, is with a dyno. The GT-40 irons are definitely a step above the stock E7s, but not by much.
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