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Should I jump on these? I'm just starting to get into the idea of building an engine, watching videos and whatnot. I know the GT40 and GT40P heads are popular upgrades.
The 40P has a weird angle on the plugs that can interfere with some exhaust setups as I understand it.
Just something to watch for when you're planning.
Other than that the ad's deleted so I don't know if you stole them or not; definitely the way to go for horsepower upgrade though.
Got them for $100. He pulled them off of a running 97 explorer that he said ran great, but had scoring on the piston walls, so he scrapped the project. Guy must've had 20 projects going lol.
Definitely have read about the header problems. Most seem to say it is solved with a 90 degree spark plug boot.
I wanted to do headers and an exhaust but figured I better start where it counts. I am entertaining the idea of a new cam too - really I am just becoming familiar with everything by reading a lot and going to youtube university. Should be fun hopefully.
Nice score! I bought some p heads a few years ago for a project but the machine shop stole them from me
My recommendation would be to use GT40P specific headers. Some have had success with the 90* plug boots while others haven't. If you're in the market for exhaust anyways and don't already have header, save yourself a headache and buy p headers.
Better flow, slightly higher compression. Bolt on 20-40hp for a 302. The GT40 was used on mustangs and some explorers, GT40P on 97 explorers and Mountaineers I believe. GT40P is supposed to be the best factory head ford ever made for the 302. It just needs a special header, and all of the smog pump stuff has to go for the F150 application.
Man, the level of information on these heads is a little intimidating. I think the fact that most of the info is about mustangs makes it a little more difficult to follow.
I have read qdeezie's 5.0 thread several times now. Still confused about a few things, so here we go.
1) My truck is a 94 and it has the 302 HO firing order, but it is speed density because it is a manual transmission. So I am a little confused how to assess which cam I have, and whether or not it would be wise to just bolt on these heads and go, or whether or not I need to upgrade the cam, springs, etc.
2) If I need to upgrade the cam, then it brings into consideration the possibility of doing a MAF conversion. It's a little more difficult because you have to source a mustang computer for my application. I have had several people tell me to do it, and several tell me it isn't worth it.
Any insight or advice is appreciated. Just trying to learn before I open my pocketbook all the way up. I'm also willing to entertain the idea of building a complete engine from scratch, possibly moving up to a 351. I have a good solid running 302 in my truck right now that is not showing any signs of going bad on me, so I can be patient, but at some point the money you are willing to spend dictates the course of action you should take. I'm looking at around 3K being my max ceiling, with about half of that available now. Any more than that and I'll just buy another truck with a 460
You should have a basic RV cam with the lumps set up for an HO firing order.
Your lower intake is already the best one so opening up the heads (GT40) should perk it up considerably.
If you change the cam, 2 things; too lumpy and speed density doesn't like it. And if you go for a higher end horsepower cam, you lose the bottom end torque; makes it a dog off the line.
You should have a basic RV cam with the lumps set up for an HO firing order.
Your lower intake is already the best one so opening up the heads (GT40) should perk it up considerably.
If you change the cam, 2 things; too lumpy and speed density doesn't like it. And if you go for a higher end horsepower cam, you lose the bottom end torque; makes it a dog off the line.
So then given that I have the basic SD cam but just ground to the HO firing order, how would you assess the bolt-on-ability of these heads. From what I understand the 97 explorer (the source of these gt40p heads) has a different cam - the same cam that is found in the MAF F150s of our trucks generation. So my thinking is that I cannot just bolt these heads on and go.
04-21-2017, 11:59 AM
GT40P heads
