[bizzell555]

I would like to know if gt40p heads are worth the the trouble on the cheap?Also what would a good gear for me?with 2.73 in 5th gear is only 1800rpms(268h voodoo flat tappet cam)3.55,3.73 or4.10 or is that to much?

[wildstang803]

the gt40 heads will unleash alot of power, thats the big diff between a cobra vs gt.I say its worth it deff, and the gears, what type of mpg you looking for?I have the 4.11 rear(great preformance,bad mpg) but you have a 5 spd.. I think 3.73 is the best choice for a strong dailey driver.. the gt40 set up is not hard, be sure to go with all new gaskets and seals for less trouble in future.

[bizzell555]

Does anyone have gt4op heads?If so would you say they are worth the trip to the junkyard?MY e7 heads seem to be a weak point in my drive train.

[bizzell555]

I need all the help I can get.Are you talking about gt40p's ??

[Bullitt95]

If you're gonna get the GT40P heads you might as well get the Explorer intake as well. These are good heads but you need MAC P specific headers, Explorer spark plugs, and 90 degree plug boots to make them work.
If you can get those heads cheap (not more than ~$500) they're worth it, otherwise go for better-flowing aftermarket aluminium heads.

[5SpeedGT]

Don't forget that upgraded valve springs WILL be required. TFS makes a nice drop-in package for $130 or so from Summit.

Also, the FRPP stainless headers are a better choice for about the same price as the MAC's.

[Dave]

Read this article.

GT-40P Heads - 5.0 Mustang & Super Fords Magazine

Dave

[5SpeedGT]

Either will be worth it. The P's are more efficient and will net you a little more compression as well. You will need up-graded valve springs(TFS has an inexpensive drop-in kit), and P-specific headers(FRPP's are the best way to go). BBK and MAC LT's also work.

Top it off with a Weiand Stealth or Performer RPM intake, along with a 600-650 Holley, and 3.73's, and you'll have a very nice, streetable 'stang that will pull 280-300 RWHP, and net high to mid 12's with traction at the track.

[EagleAutosports]

Definitely, go with the P's. Those 1982 heads are rather wimpy. Go with that spring kit he mentioned, those would be highly advised.
And you should be able to go with either 3:73 or 4:10, depending on if it's a daily driver or not.

[5SpeedGT]

Hey Eagle, Did you merge the threads? I thaught I was losing it for a second....

[Heavyhitters]

I wouldnt mess with the GT40Ps headers are expensive. I went down that road when I was younger and wasted alot of time and money when I could have bought a set of Aluminum heads. I ended up going out cheap bought a set of RPM's and my car ran like it had never ran with the GT40Ps.JMO Dave

[bizzell555]

I have a weiland intake and e7 heads,and a holley 600cfm .1982 302h.o block bored .20

[bizzell555]

what iron heads would be a good choice for me then.with a 600-700 dollar budget?Would hate to throw 250 on my summit headers away!!

[76Ford90LX]

Do it. Many people have with great results. It is way worth it for the price. Sure you can get more out of other heads but you will pay more.

I would kill to even be able to find Explorer heads in my local Junk Yards. Heads are $70 a piece for me but NO Explorer heads around here.