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Unread 02-11-2010   #1 (permalink)
lldjslim is offline Rookie

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Default I Did Not Know That Ford Explorers w/ The 302 Engine Had GT40 Heads

I found this out about a 6 months ago. I went to a local junkyard and found a 1999 ford explorer that had 98,000 on the odometer w/ a 302 and got the GT40 heads for $200 for both heads. Talk about a deal.

Know I want to know would they really bolt up to the 302 found in the mustang. And do I need to have the heads polished and clean
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Unread 02-11-2010   #2 (permalink)
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Yes they will bolt right up. You should take them to a machine shop and have them hot tanked at least. Also make sure they are flat where they bolt up to the engine. If they are not you can have the machine shop shave them. Basically have them make sure they are in good working order before you install them when they are not at their best.

When buying spark plugs from now on get them for a 97 ford explorer.
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Just try and keep it between the ditches.
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Unread 02-11-2010   #3 (permalink)
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if its a 1999 explorer they are GT40-P heads

they have a different spark plug angle,and only certain headers will clear the spark plug angle. i have a set on my car,i paid $68 for the set at my local junkyard

headers that are known to work:
bbk shorty w/90* spark plug wires
bbk longtube w/90* spark plug wires
mac shorty
mac 1-5/8 longtube w/90* wires
frpp shorty

also the explorer intake is just a cast version of the gt40/cobra intake and can also be used on the mustang
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Unread 02-11-2010   #4 (permalink)
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also have the springs upgraded,they are the weakest link in the head ....i have some at the machine shop as we speak.
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Unread 02-11-2010   #5 (permalink)
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need4spd90 Nice save with the 1999 details.
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Just try and keep it between the ditches.
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Unread 02-11-2010   #6 (permalink)
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those are gt40p i like the reg gt40 heads bigger valves,i think the only reseason people like the gt40p heads it gives u higher compression than gt40 heads its cuz the gt40p heads are 58cc and gt40 heads are 65cc-69cc,now im only talking explorer heads not lightning or cobra cuz there cc size may differ than what i posted
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Unread 02-11-2010   #7 (permalink)
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if you read up on them although the exhaust valve is smaller,there the best flowing production head ford has ever offered for the 5.0.....just google GT40P,heads,theres alot to read....good info.
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Unread 02-11-2010   #8 (permalink)
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Sweet then i have GT-40 heads on my exploder,learn something new everyday
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Unread 02-11-2010   #9 (permalink)
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96-early 97 explorers/mountaineers had GT40 heads
late 97-2001 explorers/mountaineers had GT40P heads

as milford stated,the P heads,although they have smaller valves,outflow/outperform the "standard" GT40 heads bit a bit. larger valve size doesnt always mean everything/anything..i refer you here:
http://www.hunterstyle.com/thumper/valvesize.php

and as 89rednotch said,the P heads have smaller chambers,which may bump your compression a bit over stock..the standard gt40's will actually lower your compression,unless you have them milled..IIRC milling them .030" will bring you back to stock-ish

the cobra's and lightnings that came with the gt40's were milled from the factory to keep the CR up,and also had the holes drilled thru them for the smog pump stuff. the explorer heads did not

the intakes are all basically the same,but somewhere in 98-ish,they stopped producing them with the internal EGR hole and switch to an external EGR setup on the explorers/mountaineers

these later year intakes also did not have the boss on runner #5 where you would drill/tap for the ACT sensor. it can still be done without the boss on runner #5,but you have to be more careful doing it..i think theres enuff "meat" there to get at least 4-5 good threads tapped on the later model..TMoss would be able to tell you a bit more about that
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