gt40 heads on 302 help - MustangForums.com


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Old 06-16-2007, 04:52 PM   #1
flyingfool
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Default gt40 heads on 302 help

hi everyone, im thinking about getting a set of gt40s off of an old explorer to put on my 302. i was justwondering:
1.will the bolts used on the 302 heads fit the gt40s or do i need special bolts to adapt the two.
2. ive heard that you can just use a 351 gasket on the 302, and its ok to block the extra holes. is that so? (if it even applies to the gt40s)

any information is much apreciated
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Old 06-16-2007, 04:58 PM   #2
67mustang302
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Default RE: gt40 heads on 302 help

They should both be 7/16" head bolts, but if you have TTY(torque to yield) head bolts you can NOT reuse them. As far as a gasket, I haven't heard anything about that, doesn't mean it's not true though, but on my 302 I use Fel Pro 1011-2. Also be sure if you have GT40's or GT40P's, the P heads will require a different headers, or modification of the headers you got.
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Old 06-17-2007, 01:14 AM   #3
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Default RE: gt40 heads on 302 help

no, wouldnt re use ttys.
is there an easy way to tell the differnce in the gt40s vs the gt40ps'?
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Old 06-17-2007, 01:30 AM   #4
maverick75
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Default RE: gt40 heads on 302 help

Quote:
ORIGINAL: flyingfool

no, wouldnt re use ttys.
is there an easy way to tell the differnce in the gt40s vs the gt40ps'?
gt40's plugs are at an angle, gt40P plugs come straight out



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Old 06-17-2007, 01:34 AM   #5
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Default RE: gt40 heads on 302 help

yeah the P's will say P on the corners near the head bolt holes. also the regular 40's are a F3 casting number and the P's are like F7 or something like that.

you'll want to use an early 351w intake gasket, and yeah there are extra holes in the gasket but you should be putting permatex around the entire water jacket anyways, which seals off that extra hole in the gasket from being able to leak. gt40/gt40p/302/351w head gaskets and exhaust gaskets are all the same, but the spark plug angle of the P's are what makes them hard to work with unless you have headers specific to the P heads.

lastly, if you score a set from an exploder your looking for 95-97.5 for the 40's and 97.5 and newer for the P's - and you need to get about .030 milled off the deck of the regular 40's to bring them into spec with the 40's used on the 93-95 cobras
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Old 06-17-2007, 03:21 AM   #6
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Default RE: gt40 heads on 302 help

if you get gt40s from a lightning you will need a steeped bolt sice the lightning used the 351 and uses 1/2 in stead of the 289/302 7/16bolts
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Old 06-18-2007, 01:16 AM   #7
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Default RE: gt40 heads on 302 help

this is good. most of my information ive alreadygathered is matching upwith everything you guys aresaying.
my77stang, you just answered myother question wich was how much, ifany had to be milled. thanks for the info and ill let you all know how it goes.
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Old 03-24-2008, 08:39 PM   #8
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Default RE: gt40 heads on 302 help

hi buddy hey you know what im not saying anybody is wrong because i get a lot off info here but i went to the junkyard the other day and i took at gt40p heads from a explorer that year was 6/96 so i dont know whay a lot off people say that from 95-97.5 comes with gt40s
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Old 03-24-2008, 08:57 PM   #9
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Default RE: gt40 heads on 302 help

wow, forgot about this post. haha. yeah, there are a LOT of 40ps out there. its been a pain finding a 96 explorer out here. at least a V8 version. but i looked into the buld history of the explorer to check. its pretty much 96 that has em. and then there are the special additons, which i dont know what they have.
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Old 03-25-2008, 07:46 AM   #10
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Default RE: gt40 heads on 302 help

hey where i live theres this junkyard its like 45 minutes way from my house but theres like 5-6 explorer with those heads on it see if you find some if you dont let me know let me knowthese heads run on ebay for a lot off money i dont know why,but let me know buddy.
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