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  #1  
Old February 19th, 2018, 07:32 AM
Dave Wilson Dave Wilson is offline
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Gt40 head swap

I am putting gt40 heads on my 91 lsc this week They have had a small resurface. Do you think I can put these heads on use same pushrods, head bolts and rockers that are on the stock heads? Is it any more horsepower to use 1.7 or 1.6 rr. Thanks
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Old February 19th, 2018, 09:10 AM
W.V. Kelly W.V. Kelly is offline
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Old February 19th, 2018, 10:49 AM
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Quote:
Originally Posted by Dave Wilson View Post
I am putting gt40 heads on my 91 lsc this week They have had a small resurface. Do you think I can put these heads on use same pushrods, head bolts and rockers that are on the stock heads? Is it any more horsepower to use 1.7 or 1.6 rr. Thanks
Like Bill just asked, how much were they milled? Was it just enough to clean the surface, or was it to make more compression. If milled a lot, you need another set of pushrods.


Rocker arms......While you can get a few more horses using 1.7 rockers on the setup you're putting together, it is only a few.
I suggest -if you're spending cash on new roller rockers- you buy some 1.6. The main reason is that when it is time to install a new cam, 99% of what you will buy will have the lift and duration spec'd out using 1.6 rockers. As in not only the total lift and duration but the ramp rate (how fast the valve is lifted) is factored in.
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Old February 19th, 2018, 01:38 PM
Dave Wilson Dave Wilson is offline
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The heads are at machine shop. The plan is only to resurface and check to see if they are square. He doesnít think they will need milling hardly any. If they do I know I will need to measure push rods. My question is if the pushrods do fit. Can I take factory rockers off my factory heads and attach them to gt40 heads. Drop in rods and tighten down rockers and reassemble. The reason for the question is so I can assemble when I get heads back or should I buy other parts. I want to drive it this weekend and I donít want to wait on parts for a week. Also gt40p springs are mentioned as weak. Will they be fine for stock cam in 5,0 ho lsc engine. If rods and rockers work should I put them back in original location
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Old February 19th, 2018, 04:07 PM
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Quote:
Originally Posted by Dave Wilson View Post
The heads are at machine shop. The plan is only to resurface and check to see if they are square. He doesnít think they will need milling hardly any. If they do I know I will need to measure push rods. My question is if the pushrods do fit. Can I take factory rockers off my factory heads and attach them to gt40 heads. Drop in rods and tighten down rockers and reassemble. The reason for the question is so I can assemble when I get heads back or should I buy other parts. I want to drive it this weekend and I donít want to wait on parts for a week. Also gt40p springs are mentioned as weak. Will they be fine for stock cam in 5,0 ho lsc engine. If rods and rockers work should I put them back in original location
Here is a problem that just popped into my head:
You've removed E7s and you're installing GT40 (side question:GT40 or GT40P?) heads.
You may need new pushrods. The pad heights may be the same, or way off. You won't know until you take the time to see if everything is right when you bolt them down.
I can say this.....I swapped the stamped steel rockers for Cobra 1.7 rockers (great deal, was not swapping cams for a long time) on the E7s and did not need different pushrods.
When I swapped in the AFR 165s, the same thing and all was well.

Bottom line is, go on Youtube and watch a boatload of videos showing the proper way to check for pushrod length with BOLT DOWN STOCK STYLE PEDESTAL MOUNT rockers.
I capitalized because there are loads of videos for stud mount rockers/pushrods.
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  #6  
Old February 19th, 2018, 05:12 PM
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Very good advice thanks
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  #7  
Old February 19th, 2018, 05:41 PM
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have to measure. Piece of advice, buy the adjustable pushrod tool to figure out the sizing if it turns out the stock ones are not right. I tried making one from a stock pushrod, but Comp measures their pushrods in a different way than Ford does, and it happens to be a method not easily reproduced at home.
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  #8  
Old February 21st, 2018, 10:28 AM
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Also, I wouldnt use the same head bolts. Due to stretching and torquing and such. Head bolts new arent that expensive considering the the problems that could occur. Go to Ford or ARP and get new ones.
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  #9  
Old February 27th, 2018, 10:00 AM
Dave Wilson Dave Wilson is offline
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Does any one know what are good headers for my 91 lsc gt40p set up?
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  #10  
Old February 27th, 2018, 03:22 PM
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The Ford Racing ones work very nicely. Not the cheapest but they're good quality and fit great. P heads specifically need headers with a little different bend to the tubes otherwise you'll never get the plugs in.
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  #11  
Old February 27th, 2018, 03:56 PM
Dave Wilson Dave Wilson is offline
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Where can they be bought. I have looked
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  #12  
Old February 27th, 2018, 05:45 PM
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good question. They used to be available from everywhere but a quick look shows them discontinued. In that case I frankly do not know what the right answer is.
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  #13  
Old February 27th, 2018, 11:57 PM
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Cool GT40P Headers

Quote:
Originally Posted by gadget73 View Post
good question. They used to be available from everywhere but a quick look shows them discontinued. In that case I frankly do not know what the right answer is.
I have a set that are supposed to be correct, but I also have the P heads. I'd have to split them up and I don't want to do that. I have a set of stock headers I will try and match up then maybe.....

Seems like I read somewhere that a different plug could be used. You might search that.
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  #14  
Old February 28th, 2018, 11:12 AM
Dave Wilson Dave Wilson is offline
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Looks like headers need to be put into place before putting heads back on because of limited space.
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Old March 1st, 2018, 08:56 AM
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Quote:
Originally Posted by Dave Wilson View Post
Looks like headers need to be put into place before putting heads back on because of limited space.
Dave, go to www.corral.net
There is the Windsor Tech forum and the Mustang General Tech forum.
Searches in one or both will likely produce the info you need on what headers work best with P heads.
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Old March 1st, 2018, 08:59 AM
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Looks like headers need to be put into place before putting heads back on because of limited space.
Not quite certain what exactly you mean, but if you're saying you need to bolt the headers to the heads, and then install the heads, nope.

Passenger side the header slides in from the top if all the emissions stuff is out of the way.
Driver's side you come in from under.
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Old March 1st, 2018, 01:28 PM
Dave Wilson Dave Wilson is offline
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I was not going to bolt to heads first. I was thinking they should be positioned, bolt on heads then bolt to heads. I didnít want to mount heads and the realize there was no room from bottom or top to get them in place
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Old March 1st, 2018, 02:28 PM
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Quote:
Originally Posted by Dave Wilson View Post
I was not going to bolt to heads first. I was thinking they should be positioned, bolt on heads then bolt to heads. I didnít want to mount heads and the realize there was no room from bottom or top to get them in place
Gotcha.
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Old March 2nd, 2018, 05:42 AM
Dave Wilson Dave Wilson is offline
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I have ordered a set of macs headers. I will let you know how they fit
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Old March 2nd, 2018, 09:35 AM
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Quote:
Originally Posted by Dave Wilson View Post
I have ordered a set of macs headers. I will let you know how they fit
I strongly suggest you also order a set of ARP header bolts, the ones with 3/8 12 point heads.
You are about to find out that the bolts provided with headers will technically work, but are a huge pain in the rear.

You are also about to find out that you are going to have to grind and reconfigure the oil dipstick mount at the header bolt. Maybe even bend the tube itself as well.

You also need to order a set of FelPro 1415 header gaskets, as the ones provided with the headers are garbage. Really, just throw them away.

When installing headers, snug them as best you can on initial installation. After that, you need to go back and retighten them after every heat cycle for 4-5 times. If you don't, you'll have leaks.
After that, you're golden.
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  #21  
Old March 2nd, 2018, 04:12 PM
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Alternative option, socket key cap screws and a long bit with a ball hex end. The reduced hex ones that come with the headers do indeed suck.
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Old March 6th, 2018, 05:23 PM
Dave Wilson Dave Wilson is offline
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Ok, here is where I am now. I have heads ready to go on. The gt40 heads donít have the holes for cross over pipe. No big deal I just donít know what to do with the pipes. Should I just plug the pipe at the nearest fitting with a plug or eliminate the whole thing. Any suggestions ?
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Old March 6th, 2018, 07:26 PM
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personally I'd ditch the whole thing. Smog pump and all. If you need it for visual inspection I believe you can bolt it up and just plug it.
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  #24  
Old July 22nd, 2018, 07:12 AM
Dave Wilson Dave Wilson is offline
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Quick update. I have completed the swap. Everything looks right. I fired up the car and it ran rough. Would not idle but I did drive it to end of the street. Now it will not run. I think it is flooding or just misfiring but will not start at all now. I may of based the plugs. Should I try replacing the computer and if so what computer should I look for. I don't want to test it back down but I will if someone can think of a fix. Thanks again I love this car
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  #25  
Old July 22nd, 2018, 07:15 AM
Dave Wilson Dave Wilson is offline
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I meant to say gassed the plugs
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