gt 40 heads
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Junior User
Joined: Mar 2011
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gt 40 heads
ok i recently got a v8 explorer motor thAt has the heads i want. im going to send them out to have them checked ported and polished and rebuilt. anything thing else i should have done to them before install? i was planning on putting them on my truck. my other question is my truck has just about 150k runs great dosent burn or leak a drop of oil. in your opinion would be ok to goahead and install themn whithout haveing to do a rebuild or should i wait until i do a total rebuild? also what kind of hp and tourqe should i expect whith the heads on whith long tube headers not cats and amagnaflow muffler thanks ahaead for all the info
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Junior User
Joined: Mar 2011
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at thge moment the motor is all stock. im slowy trying to do some mods. again i got stock heads from a 5.0 explorer that i was going to have rebuilt and would like to know what else i should have done to them. then i was wanting to put them on my stock motor with longtube headers no cats and somekind of muffler with a good sound. just wanting to get a estimate what i would gain by doing this
Elder User
Joined: May 2010
Posts: 970
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From: Northeast Ohio
assuming you have a 302 in your truck you can add 1.7 rockers how many miles are on the heads you might be able to just clean them paint them and throw them on. and if you have the motor still and depending on the shape its in you could always swap out the motors then depending on the year of your truck youll be upgrading to a roller motor as well.
Fleet Mechanic
Joined: Aug 2005
Posts: 1,462
Likes: 74
From: Hartford, AL
What you have is gt40p heads. These heads do have some issues with header fitment due to revised spark plug angle, so do your homework on what will fit. There are some companies that make headers for the p's. With a decent port job expect gains in the 25 HP and 25 torque range. If bottom end is good, throw on em on and go. One other, you may need to back timing down a bit or run higher octane fuel due to decreased combustion chamber size....increasing compression ratio.
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Junior User
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the motor in my truck is a 5.0 with 150k and is in great shape. the 5.0 i got from the junkyard is unknon and i just bougfht it for the heads. i still want to take the heads to the machine shop to have it ported and polished not sure what else i should have done to them before i install them. also wheni put them on i plan on putting a rv cam in my truck while its apart. what ekse should i do or have done. in the far fiture i do plan on makeing alot more improvements as the money slowy comes in. so with the planned mods im doing what kind of power should i expext or do you need more info thanks
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Fleet Mechanic
Joined: Aug 2005
Posts: 1,462
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From: Hartford, AL
Good point cjben....I think 96 and 97 explorers had te regular gt 40 heads and in 98 went to the gt40p. Look at the casting info on the front right of the head. Give us the info...and that will help determine what you have. What year is your truck?
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Fleet Mechanic
Joined: Aug 2005
Posts: 1,462
Likes: 74
From: Hartford, AL
Ok, they should just say GT40 on the front right of the head. I would still expect about a 25 HP gain if you already have longtubes installed. Again, what year is your current truck? If it was a maf truck, they were rated at 205 HP brand new. As long as your compression and overall condition of the motor is good, I would estimate around 225 to 230 HP. A small cam like an comp xe264 may add another 15 HP....but you then I would recommend a tune to get everything working together. I wouldn't do any of this if the compression readings are weak, or the bottom end suspect.
Fleet Mechanic
Joined: Aug 2005
Posts: 1,462
Likes: 74
From: Hartford, AL
Triple ditto....I asked in the post above your's and then again as we posted these post at the same time. We need more info.
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i planned omn haveing it ported and polished and the heads are high mileage so wouldnt my best bet to be new springs and vavles? i have never done a head job or cam. but i was told my best bet was to go with a rv cam. more info on this project would be great thanks