are gt40 heads any good?

pomofro · Dec 8, 2003

i was looking on ebay and saw quite a couple sets of gt-40 heads on ebay for like less than 400. i thought they were a good upgrade, why arent they more. look

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2446762583&category=33617

and

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2446928342&category=33617

they need some cleaning but whats wrong with them?

mike keirstead · Dec 8, 2003

Nothing is wrong with them. they would make a good upgrade. 25-30 horse atleast. I got mine off ebay 3 days ago for 197.50. I havnt put them on yet but they are good heads. You may have header trouble if you still have the stock ones. 90 degree plug wires are needed with the P heads cause of there different plug location.

JaysGreenLX · Dec 8, 2003

If you get those heads then you will need GT-40P specific headers. I would hang on to the money and buy a better version of the GT-40. The you have a choice of a wide variety of aftermarket headers when you are ready for them, plus the other GT-40's will make a little more power.

MustangPunk302 · Dec 9, 2003

JaysGreenLX said:
If you get those heads then you will need GT-40P specific headers. I would hang on to the money and buy a better version of the GT-40. The you have a choice of a wide variety of aftermarket headers when you are ready for them, plus the other GT-40's will make a little more power.

This is a big misconception... The problem isn't the header its the spark plug angle and people have problems with the boots getting burnt up. If you get a set of 90 degree boots it doesn't matter you can work around it with any header, unless there equal length, thats a different story considering you can easily burn up regular boot plugs wires w/ any head using equal length headers...

Gearbanger 101 · Dec 9, 2003

Either way, they're a good buy and will provide a nice little increase in power. Especially if you add an aftermarket intake or have your stock lower ported. I'd grab em...

onefaststang · Dec 9, 2003

only problem with both of those auctions, is they don't have any pictures of the P specific markings. You can't visually tell they are GT-40 heads. They may just be E7's once you get them, unless they send you more pics of the markings on them.

Stock89LX · Dec 9, 2003

FRPP has some shortie headers are designed to fit the P heads, AND will fit regular E7's and GT40's. Some guys say MAC longtubes fit with no probs at all (ie. having to use 90 degree plug boots), others say they have to use the boots.

Notchrat · Dec 9, 2003

You can get a set of brand new GT-40P heads for under $500, so a pair of used ones stock should go for $200 or less. I have heard stories of$250 - 300 with the intake for pulling off a wrecked Explorer

NKau · Dec 9, 2003

Not to butt in on the thread, but are you guys saying that you don't necessarily need different headers to run the explorer heads? I currently have BBK longtubes and would like to keep them. The reason I ask is that I have the opportunity to buy some explorer heads that are freshly rebuilt and have $600 worth of porting and come with the explorer lower intake for $400-$500. Also, does a stock 5.0 HO upper manifold bolt to the gt40 lower? Thanks.

Gearbanger 101 · Dec 9, 2003

As far as the BBK headers go, you'd have to talk to someone who's run them, but the stock 5.0 HO manifold will NOT work with the Explorer lower. The Explorer runners are staggered, while the stock HO runners are inline. You could however pick up an Explorer, Cobra, or GT-40 upper, to fit.

MustangPunk302 · Dec 9, 2003

Most longtubes don't have problems with burning up boots, I'm not to sure though, but either way I'm certain if you burn up your regular boots, 90 degree boots will probably solve the problem. Any header that will fit e7's will fit the gt-40p's but are you not gonna burn up spark plug wires is the question.

mike keirstead · Dec 9, 2003

Nkau

No a stock 5.0 and gt-40 or cobra components are NOT compatible.
I have heard the BBK longtubes will work with 90 degree plug boots

Stock89LX · Dec 9, 2003

Be sure to check out Mouse's page:
http://www.cmc.net/~xero/Mousesporting.html
There's a TON of good info there on both the GT40's and GT40P heads, plus porting E7's. He's got a link to Sean Meldrum's GT40P page (MotorCityMustang on Corral) which has moved to the "articles" section on Stangnet.com. Also check the "project cars" section. His '84 GT was the test mule for the GT40P article mentioned.

Here's a thread that I was following over on Corral about GT40's vs. GT40P's, experience with different headers, 1/4 mile times (check the sigs, too), etc. :
http://www.corral.net/forums/showthread.php?s=&threadid=159577

That should keep ya busy for a while!

Stock89LX · Dec 11, 2003

I was able to find Sean's temporary GT40P page:
http://www.geocities.com/motorcitymustang/gt40p-original.html

And a good thread with P head dyno results:
http://www.corral.net/forums/showthread.php?s=&threadid=357813

PURESTREET5006 · Dec 11, 2003

I had GT40 iron heads when i first ran FFW T/S we ran well with those to the tune of 12.0's@110 mph and once we ported them we ran right down to the 11.7's with these heads fully "race" ported and milled to 50cc and a custom ground comp cam

Legendary · Dec 11, 2003

I love my Gt-40's. Well worth the money. Mines are off a 93 cobra so i don't have the header issue.

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