gt40's - MustangForums.com

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gt40's

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Old 03-25-2007, 02:45 PM
  #1  
dv3
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Default gt40's

do the gt40 heads from a 94 cobra have the same specs as gt40 heads from an explorer?
is $200 kinda expensive for the 94 cobra heads?
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Old 03-25-2007, 02:53 PM
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LIL D
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Default RE: gt40's

the gt40 are iron and have 1.85/1.54 valves i thinkand the gt40ps are aluminum and have different valve sizes i know exhaust is a 1.46 or what ever factory size is on e7 heads and usually gt40 heads go for around 300
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Old 03-25-2007, 02:54 PM
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LTnone
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Default RE: gt40's

Same heads.

Edit: now that I think about it, I'm not sure if the combustion chamber is the same size or not. At least on the '93 Cobras, the chamber was 64cc, as opposed to 65-6cc on the Exploders. You can get the same effect with Exploder heads by milling them down a bit.
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Old 03-25-2007, 02:56 PM
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tmajikman
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Default RE: gt40's

I think the combustion chamber on the cobra heads are smaller, the cobra heads are better from what I here, as long as they are not cracked or anything. 200 bones sounds good for cobra heads.
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Old 03-25-2007, 02:58 PM
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TTGreenSN95
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Default RE: gt40's

Both heads are cast iron but they are different indeed I just put a set of gt40p's on my stang Ill let you know how they do if i ever get it started lol I know the gt40p need a different header and they do not have smog holes in the back. i got my gt40p's from ebay for 299.00. good luck
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Old 03-25-2007, 03:00 PM
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dv3
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Default RE: gt40's

94 cobra would be gt 40...not gt 40p ....correct?
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Old 03-25-2007, 03:00 PM
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my77stang
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Default RE: gt40's

just to clarify.... intakes are 1.84 on the 40 and the 40P and ex is 1.54 on the 40 and 1.46 on the 40P
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Old 03-25-2007, 03:02 PM
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tmajikman
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Default RE: gt40's

ORIGINAL: dv3

94 cobra would be gt 40...not gt 40p ....correct?
correct
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Old 03-25-2007, 04:28 PM
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frdmstng1986GT
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Default RE: gt40's

ORIGINAL: my77stang

just to clarify.... intakes are 1.84 on the 40 and the 40P and ex is 1.54 on the 40 and 1.46 on the 40P
you are right.. just a little more fact on it that even though the P's have smaller exhaust valves they actually flow better on the exhaust side then the regular 40's do.
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Old 03-25-2007, 04:41 PM
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Joel5.0
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Default RE: gt40's

'94-'95 Cobra GT40 heads (F4ZE) = 60-63cc chamber, 1.84"/1.54" valves
'96-'97½ Explorer GT40 heads (F1ZE) = 63-66cc chamber, 1.84"/1.54" valves
'97½ -'01 Explorer GT40p heads (F77E) = 58-61cc chamber, 1.84"/1.46" valves
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