Gt40p heads and 1:7 roller rockers on 86 motor - Mustang Evolution

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Old 04-15-2012, 11:27 AM   #1
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Gt40p heads and 1:7 roller rockers on 86 motor

I have read many forums and magazines and still am not sure if this combo will work. I know that when doing piston to valve clearances it's always good to measure. I wanted to know if anyone has had success in this setup. I already have the parts and haven't spent a dime on them. It would be great if it worked. I'm also using a E303 cam. Thanks in advance for your help.
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Old 04-15-2012, 11:44 AM   #2
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I dont know about your clearence issues but unless you port those heads, you will not be happy. I had a 88 gt with the exact same thing and only produced 265 hp on the dyno. I was told you only produce 1.1 hp per ci with those heads at best. Those heads are no better than your stock ones. Thats just what i have been told. I had the e cam n everything, i had dual springs in my heads also! I thought it sounded good too until i started telling people that knew theyre stuff and they said it was basically junk. Take that as you wish, its just what i was told.
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Old 04-15-2012, 11:54 AM   #3
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Really? I was told that it was a 35-40hp increase over the e7 heads(I think that is with the upper and lower intake also;which I have). Well it's nice to hear an outcome from somebody who has used this combo. Did you have to make modifications to the heads to make it work?
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Old 04-15-2012, 12:03 PM   #4
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I bought it that way being told she was pushing 375hp. Dont take my word for it, do what you think will turn out good. It may turn out way different, ya never know. My mods were, high volume oil pump w/ windage tray, 302 bored .030, 190l fuel pump, 24lb injectors, tfs track heat upper and lower intake, e303 cam gt40 p heads w/ dual springs,76mm mass air, 65mm tb, shorty headers, 1.7 rr, ud pulleys, just a bunch of the usual easy upgrades. Like i said, that only got me 265 hp. I was soooo disappointed. Also my heads were not worked at all. I would imagine if you work them you would see different (better) numbers! Hope this helps you whatever way you decide to go.
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Old 04-15-2012, 12:21 PM   #5
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Yea any help I can get I appreciate. That would tick me off thinking I'm getting that much horsepower and finding out its a lot less. I'll prob put the heads on because I have them. Maybe I'll have them ported or buy aluminum heads this winter.
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Old 04-15-2012, 12:28 PM   #6
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I know when i called trick flow and talked to ed pinnegar he said he could get me a set of the tfs tw aluminum headz with every thing needed including 1.6 rr for 1370$ out the door. That was the best price i got from anyone. Theyre the best heads for those cars, imo, street wise.
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Old 04-15-2012, 01:03 PM   #7
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Quote:
Originally Posted by mi03svt
I bought it that way being told she was pushing 375hp. Dont take my word for it, do what you think will turn out good. It may turn out way different, ya never know. My mods were, high volume oil pump w/ windage tray, 302 bored .030, 190l fuel pump, 24lb injectors, tfs track heat upper and lower intake, e303 cam gt40 p heads w/ dual springs,76mm mass air, 65mm tb, shorty headers, 1.7 rr, ud pulleys, just a bunch of the usual easy upgrades. Like i said, that only got me 265 hp. I was soooo disappointed. Also my heads were not worked at all. I would imagine if you work them you would see different (better) numbers! Hope this helps you whatever way you decide to go.
I think your 265 sounds about right.that's nearly 80 horse over stock. I would throw those heads on there if I already had them.they are still an improvement over stock. And yes trickflow does make a great head.
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Old 04-15-2012, 01:08 PM   #8
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I'm guessing I have to drill holes in my heads for the smog hose that goes between the heads? That's what I read anyway. My motor has the E6 heads and with the 1:7 rr I know the valves won't even come close to hitting the pistons. What is my best option?
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Old 04-15-2012, 01:11 PM   #9
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Originally Posted by Reaper91
I'm guessing I have to drill holes in my heads for the smog hose that goes between the heads? That's what I read anyway. My motor has the E6 heads and with the 1:7 rr I know the valves won't even come close to hitting the pistons. What is my best option?
I don't remember about that.those e6 heads are better off being used as boat anchors.they are worse than the e7s.that makes it more of a reason to use the gt40s.
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Old 04-15-2012, 02:18 PM   #10
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Re: Gt40p heads and 1:7 roller rockers on 86 motor

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Originally Posted by Reaper91 View Post
I have read many forums and magazines and still am not sure if this combo will work. I know that when doing piston to valve clearances it's always good to measure. I wanted to know if anyone has had success in this setup. I already have the parts and haven't spent a dime on them. It would be great if it worked. I'm also using a E303 cam. Thanks in advance for your help.
I really don't think they will work.
If you have a stock piston 86 5.0 it uses a flat top piston and I bet your PV clearance will be insufficient.
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Old 04-15-2012, 02:21 PM   #11
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Originally Posted by Trojan Horse

I really don't think they will work.
If you have a stock piston 86 5.0 it uses a flat top piston and I bet your PV clearance will be insufficient.
only one way to find out for sure.worst case scenario get 1.6 rr
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Old 04-15-2012, 02:55 PM   #12
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Re: Gt40p heads and 1:7 roller rockers on 86 motor

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only one way to find out for sure.worst case scenario get 1.6 rr
Yes sir, for sure!
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Old 04-15-2012, 03:48 PM   #13
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Yea I'll probably do that. It appears also that my push rods are not the right length for these rockers either…what a mess
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Old 04-15-2012, 04:00 PM   #14
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Kinda confused but did you say that you are already running 1.7s and if you are what valve covers did you go with. Didn't think stock would hold 1.7s and by that time you would need a intake spacer due to tall valve covers. Didn't know if you was aware of that or if that was a fixed problem
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Old 04-15-2012, 04:09 PM   #15
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what size pushrods you have?
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Old 04-15-2012, 04:16 PM   #16
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I have factory length pushrods. I tightened one of the rockers all the way down and I can wiggle the pushrod. I bought aftermarket valve covers that appear to be a little higher than the stock ones. I don't know for sure if they will clear.
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Old 04-15-2012, 04:32 PM   #17
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that sux. i guess not all rocker arms are the same.i do know some people with those heads get away with stock prods.your gonna have to use a p rod length checker tool.they are pretty cheap. just to be sure did you just set #1 with it being tdc?
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Old 04-15-2012, 04:35 PM   #18
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Yes I did…
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Old 04-15-2012, 05:30 PM   #19
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I'm in kin of the same boat as you but I have just the GT40 heads not the p. I have an 86 block that have the "stupid pistons" that we're only in the 86 motors, I also have a block that I was told was 89 but turns out it's a 91. I have to pull the forged pistons from the 91 motor and put them in the 86 block due to the lack of valve reliefs in the 86s.
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Old 04-15-2012, 05:52 PM   #20
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The gt heads work well with higher compression 10.5 plus and a 1.6 on the intake with a 1.7 on exhaust with an e cam is preferred when installed straight up timing wise. It makes the overlap mucho better and pull some torque up higher in te rpm s
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Old 04-15-2012, 06:21 PM   #21
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Is it possible that the gt40 heads won't fit that block with those pistons at all? There really isn't much room at all.
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Old 04-15-2012, 06:26 PM   #22
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It's possible.but I would think that with 1.6 it should
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Old 04-15-2012, 06:26 PM   #23
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I'm pretty convinced its easier to just port and polish the factory heads and go with those instead of going through all the trouble to swap parts around and hope and pray that it all works out right
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Old 04-15-2012, 06:27 PM   #24
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I'm pretty convinced its easier to just port and polish the factory heads and go with those instead of going through all the trouble to swap parts around and hope and pray that it all works out right
I'm not.e6s are garbage. These hassles are just part of kidding a motor imo
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Old 04-15-2012, 06:27 PM   #25
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Yea I should find a set of e7 heads. I have e6 heads but like I was told;they make good door stops
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Old 04-15-2012, 06:28 PM   #26
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Those heads made about 25 horse less than the e7
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Old 04-15-2012, 06:29 PM   #27
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No I have an extra set o e7s
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Old 04-15-2012, 06:29 PM   #28
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I have some used factory 1.6 arms ill give you for super cheap if you wanna try those.they are not roller and are used.
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Old 04-15-2012, 06:34 PM   #29
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Wow 25 horses less... That's no good. Kind of defeats what I'm trying to accomplish

---------- Post added at 07:34 PM ---------- Previous post was at 07:32 PM ----------

Thanks dreamstang I have the set that came on those heads. If I have to I'll reuse them. Thanks
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Old 04-15-2012, 06:36 PM   #30
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Wow 25 horses less... That's no good. Kind of defeats what I'm trying to accomplish

---------- Post added at 07:34 PM ---------- Previous post was at 07:32 PM ----------

Thanks dreamstang I have the set that came on those heads. If I have to I'll reuse them. Thanks
the e6s made 25 less horse than the e7s, not the gt40. the gt40s are the best factory windsor head.
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Old 04-15-2012, 06:37 PM   #31
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Does anybody know about that air tube that connects the two heads at the back of the motor. I think it's for the smog pump but I'm not sure. I haven't seen it before. The motor was already out when I picked it up. It's an 86 with 50000 miles going into my 91.
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Old 04-15-2012, 06:44 PM   #32
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imo. i would buy the p rod length checker.they are lke 15$. then bolt up your 1.7 with clay on the piston.once your checker is setup turn your motor over 2 rotations on the crank by hand till your back to tdc.you will have to do this on both valves.then this will tell you if the 1.7s will work.if not repeat process with 1.6. the prod checker will tell you the p rod length you need and let you check ptv clearance without purchasing new p rods.this is what i would do.it is somewht of a hassle but the right way to do it. imo

---------- Post added at 06:44 PM ---------- Previous post was at 06:42 PM ----------

the tube in the back does go to the smog pump.most people delete them with a short 5/8 11 bolt as long as you dont have inspection.
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Old 04-15-2012, 06:48 PM   #33
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Quote:
Originally Posted by dreamstang

the e6s made 25 less horse than the e7s, not the gt40. the gt40s are the best factory windsor head.
From my understanding he has the gt40p heads. Those are not the same as the regular gt40 are they? Ths "p" stands for production meaning they put them on everything. The ones i had were the same and i just was not happy with them.
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Old 04-15-2012, 06:48 PM   #34
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I thought so. I do have inspection and emissions. For my year it is only visual though.
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Old 04-15-2012, 06:51 PM   #35
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the p's are almost the same head.they have a revised spark plug angle which more centers the plug in the combustion chamber.this help make a few horses but make changing plugs a pita and limits header choice.
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