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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
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Old 05-14-2013, 03:30 PM   #1
95 gt 5.0
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Default GT40 heads

Im looking to swap the heads on my 95 GT 5.0HO, a buddy of mine has a 97 5.0HO with GT40 heads that came out of a 97 mountaineer. Will those heads be a direct fit on the 95 motor, or will they need modification? There is not much more that i can do to the motor that is inexpensive, it already has a ford racing cam, upgraded ignition, and a cold air intake.
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Old 05-14-2013, 11:54 PM   #2
rmodel65
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97 should be gt40...if its a late 97 it will be gt40p heads and require different exhaust headers tahn stock...does he have the exploder intake and throttle body too?? those are also upgrades but you will need an elbow adapter for the throttle body(unless you want to convert to a fox style setup)
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Old 05-15-2013, 01:13 AM   #3
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I hope you are getting these heads very cheap.
If you have to do any work on them it's sort of a waste of money.
Think of it as sort of a money out vs. performance gained type of deal.......
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Old 05-15-2013, 06:45 AM   #4
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I'm not sure if its an early 97 or later, I will check when I see it on Friday. As for the intake and TB, it's whatever was stock on that engine. Also, only $200 for the entire setup from intake to oil pan.
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Old 05-15-2013, 07:07 AM   #5
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200 bucks for the entire engine is a really good deal Id buy it just for the heads intake and throttle body then either part it out or scrap the rest if your not using that block.

Will the heads bolt up Yes they are a direct fit, You don't need special headers for gt40p heads but it helps because the angle of the spark plug is different and removing and changing plugs on a few cylinders is a pain in the butt , also you need 90 degree angle spark plug boots for the gt40p heads. Other wise the wire boots will be up against the header . However I believe the gt40p heads have a better valve spring than the gt40 heads. Id replace the valve springs on the gt40 heads to something a little stronger or your risking valve float at higher rpms. A good google search of the subject should turn up all kinds of tips and information for making this change as its a very common upgrade , so common in fact that I am having trouble finding a good set of used gt40 heads in my area at any of the parts yards. I had to order my gt40 explorer intake off of ebay and I paid almost as much for it as your gonna pay for the whole engine... So its a good buy..
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Old 05-15-2013, 07:33 PM   #6
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I'm pretty sure that the GT40 heads have 3 bars on the front casting and the P heads have 4.
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Old 05-16-2013, 01:19 AM   #7
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May as well do the valve stem seals while you are doing the valve springs......
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Old 05-16-2013, 07:11 PM   #8
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Despite the comments about over investing in GT40 heads, my local machine shop charges about $125/head to grind the seats, cut the valves, lap them in, square the decks,replace the seals, reassemble and return ready-to-run.

I have no problem with $250 to make sure the combo is gonna run right with an honorable warranty (basically a handshake, but they stand by it).

Just my $.02... I paid to have my GT-40s ported and polished, so maybe I'm not the best critic in this regard.
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Old 05-16-2013, 10:12 PM   #9
rmodel65
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you could always go sleeper on the combo

http://www.hunterstyle.com/thumper/
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Old 05-17-2013, 08:31 PM   #10
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Nice.! That's a steel at $200 for the explorer motor!!
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