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.

GT-40X Heads

Old 06-16-2008, 04:54 PM
  #1  
87Stallion
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Default GT-40X Heads

Are the GT40X alot better than the GT40 P's? Theres a local guy selling a pair brand new in the box for 800$. Are they worth it.
I am about to rebuild my engine and I just wanting you guys opinion before I bought them.
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Old 06-16-2008, 05:15 PM
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87foxgt
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Default RE: GT-40X Heads

dont buy. go with something better. anything above 180cc you well have to notch the pistons but its worth it so im told =( im going with afr 185cc or up idk yet but i do kno i well be notching my pistons
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Old 06-16-2008, 05:34 PM
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91hatchgt
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Default RE: GT-40X Heads

the X heads are much better than the P's.. They have a turbo swirl design for better airflow, not to mention they are aluminum compared to the Cast steel of the P's. The X heads also have bigger valves. Overall a better head. My brothers fox has GT40 X heads, and it performs very well. 800 bux is not a bad price for brand new X's. I would buy them if you are looking for a good aluminum head without breaking the bank.
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Old 06-16-2008, 05:54 PM
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camaroeater
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Default RE: GT-40X Heads

i heard gt40x's weigh 25lb less than the GT40 irons...can't remember if thats one head or both.
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Old 06-16-2008, 06:29 PM
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87Stallion
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Default RE: GT-40X Heads

Thanks for the info. I did a little research and they say you can gain 40 HP with these heads. I might go ahead and buy them.
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Old 06-16-2008, 06:36 PM
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crueheadstang87
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Default RE: GT-40X Heads

ORIGINAL: 91hatchgt

the X heads are much better than the P's.. They have a turbo swirl design for better airflow, not to mention they are aluminum compared to the Cast steel of the P's. The X heads also have bigger valves. Overall a better head. My brothers fox has GT40 X heads, and it performs very well. 800 bux is not a bad price for brand new X's. I would buy them if you are looking for a good aluminum head without breaking the bank.
+1 on that. the afrs are really nice, but you cant beat gt40xs for 800 dollare. i say go for it!
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Old 06-16-2008, 09:22 PM
  #7  
stang8689
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Default RE: GT-40X Heads

I have gt-40X not bad but AFR will smoke it
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