Gt-40 vs. GT40p vs. GT40X

5.0 Pony · 12-14-2002, 01:01 PM

Hey guys, i would like to get some new heads for my stang, as i know these really open it up. I am very interested in getting some GT-40 heads, but what is the difference?? Gt40 Gt40p and GT40X? What is the diff? GT40p's came on explorers right? Also, how much HP would i be looking at with a new set of heads, in a gain wise. THANKS!!!

Bobasaurus · 12-15-2002, 12:22 PM

GT-40 - Old school iron heads.
GT-40p - Newer school iron heads. Better plug placement and needs correct headers because of plug placement. Smaller CC than the GT-40 for higher compression (if you need or want more compression)
GT-40X - Aluminum heads

Check here for flow numbers

Flow Page - Good Stuff

Good luck.

5.0 Pony · 12-15-2002, 05:18 PM

ok thanks

12-14-2002, 01:01 PM	#1
5.0 Pony Registered Member Join Date: Jun 2002 Location: Nebraska Posts: 127	Gt-40 vs. GT40p vs. GT40X Hey guys, i would like to get some new heads for my stang, as i know these really open it up. I am very interested in getting some GT-40 heads, but what is the difference?? Gt40 Gt40p and GT40X? What is the diff? GT40p's came on explorers right? Also, how much HP would i be looking at with a new set of heads, in a gain wise. THANKS!!! __________________ 1988 Mustang 5.0 LX Convertible -Mac Cold Air Intake -K&N Cone Filter -9mm FMS Spark Plug Wires -Hedmann Headers 2.5" O/R H-Pipe -Flowmaster 40 series 2.5" Catback

12-15-2002, 12:22 PM	#2
Bobasaurus Registered Member Join Date: May 2002 Location: South Carolina Posts: 58	Not an expert, but .. GT-40 - Old school iron heads. GT-40p - Newer school iron heads. Better plug placement and needs correct headers because of plug placement. Smaller CC than the GT-40 for higher compression (if you need or want more compression) GT-40X - Aluminum heads Check here for flow numbers Flow Page - Good Stuff Good luck. __________________ Bobasaurus 1987 LX 5.0 - Engine Rebuild now installed - 26290 Wonderful Miles so far Items now installed from the garage : GT-40p heads, Explorer Intake, FMS "P" headers, Crower 15511, SFI Balancer, 24#, SPEC Stage 1, T5z, 65MM TB, 77MM Pro-M, 255lph Pump

12-15-2002, 05:18 PM	#3
5.0 Pony Registered Member Join Date: Jun 2002 Location: Nebraska Posts: 127	ok thanks __________________ 1988 Mustang 5.0 LX Convertible -Mac Cold Air Intake -K&N Cone Filter -9mm FMS Spark Plug Wires -Hedmann Headers 2.5" O/R H-Pipe -Flowmaster 40 series 2.5" Catback

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