[brokebp417]

is it true that late model 5.0 explorers had gt40 heads??

[91cobra5.0]

if i remember right its 96-2000 that have the 40s and like 2001-2003 that have the 40ps and i dont know what yeat but mountaineers have 40s on them

[brokebp417]

some one said that the gt40p heads require special headers to clear??

[White Thunder]

i don't think there special.....but there is something about the headers

[91cobra5.0]

they require special headers becuase the patern is different than stock or just plain the gt40s

[White Thunder]

oh good luck finding them

[91cobra5.0]

yea ive been hitting up the only good junkyard here in colorado springs for about 5 months and everything they get a v8 explorer in, the engine and driveline are gone

[White Thunder]

yeah you hear that all the time...damn people and there big mouths lol

[91 gt 5.0]

junkyard near me had 2 mountaineer v8s last time i went

[Timm10221]

Do you get any hp increase with those heads over our stockers??

[e3sean]

early 90's have gt40 and 97 1/2 and up have gt40p

and yes you will proly gain about 40hp (crank) from the heads and intake over stock.

[r.barn]

The GT-40P iron heads off Explorers are great head.
Flow close to aluminum GT40Y head numbers.

The spark plugs mount at a different angle and can have header
clearance problems with some headers, most header do clear though

[baine21225]

Originally Posted by r.barn The GT-40P iron heads off Explorers are great head. Flow close to aluminum GT40Y head numbers. The spark plugs mount at a different angle and can have header clearance problems with some headers, most header do clear though

+1, good info

[White Thunder]

Originally Posted by 91 gt 5.0 junkyard near me had 2 mountaineer v8s last time i went

sounds to me like an easy way to make some money

[1slo5.0]

Originally Posted by brokebp417 is it true that late model 5.0 explorers had gt40 heads??

1996 to early 1997 V8 Explorers and Mountaineers had GT40 heads. Mid 1997 to 2001 had GT40P heads. The P heads are more desireable and have more performance potential.

Originally Posted by brokebp417 some one said that the gt40p heads require special headers to clear??

Some headers do not work with P heads because of spark plug interference. The spark plug angle is different on P heads which is one of the reasons they make more power. The spark plug is positioned closer to the center of the cylinder. 90 degree boot plug wires help.

[AdderMk2]

Originally Posted by 91cobra5.0 if i remember right its 96-2000 that have the 40s and like 2001-2003 that have the 40ps and i dont know what yeat but mountaineers have 40s on them

Originally Posted by e3sean early 90's have gt40 and 97 1/2 and up have gt40p and yes you will proly gain about 40hp (crank) from the heads and intake over stock.

*deep breath*
the GT-40 heads that were found on the 1993-1995 cobras were also found on the 5.8L Lightning, and the 1996-1997.5 Explorers and Mountaineers.

The Explorer heads have a larger combustion chamber than the cobra heads, and when bolted onto a stock bottom end, will actually lower the compression ratio slightly. It is always best to have the heads machined down to a 63-64cc chamber before installing them (also makes a nice mating surface to the block)

the GT-40P heads were found on the 1997.5-2001 Explorers and Mountaineers. They featured a smaller combustion chamber that, when bolted to a stock bottom end, produced a ~9.5:1 compression ratio. These heads also have the revised spark plug location... but fear not! Most shorty unequal length headers work on GT-40P heads. You will USUALLY have to swap out the spark plug boot on the #7 wire to one with a 90° angle.

/rant

ok, I feel better now... can we all maybe try to spread GOOD information for once?

[95StangMX]

sounds pretty much exactly like what darell just said but more drawn out and complicated

[brokebp417]

well i have bbk long tubes will they clear

[1slo5.0]

Originally Posted by brokebp417 well i have bbk long tubes will they clear

Possibly. Try and find out.

[AdderMk2]

Originally Posted by 95StangMX sounds pretty much exactly like what darell just said but more drawn out and complicated

yea, funny how he posted it AS I was typing...