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GT40/GT40P/E7
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 Posted: Tue Jan 9th, 2018 03:36 am
JAMMAN

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Seen plenty on this topic in other forums.

Let's see if I understand this right.

GT40P flow better stock than the other 2, but need a spring upgrade to handle any RPM's. They have a smaller diameter exhaust valve which seems to help? (?)

GT40 can handle rpms with their springs (but upgrades are nice) BUT if you are going to port them they have more meat than the "P" heads to work with.

Ported E7's flow better than stock GT40 or GT40P, but that's about all.

Any decent brand aluminum head out flows any of the iron choices.

Additions?



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 Posted: Tue Jan 9th, 2018 10:13 am
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GT40P heads have a different plug angle as compared to E7, GT40 and most (all??) other 5.0 heads. That means that most exhaust manifolds/headers have a plug and/or wire clearance issue with the P's. 

One notable exception is the Torque Monster brand. These were designed from the beginning to clear both the GT40P and GT40 plug angles so they would fit all OE Explorer heads.  

[side note: The Torque Monsters were designed to tuck in very tightly to the factory iron Explorer heads. There MAY be clearance issues when used with aftermarket heads that have slightly different castings. My AFR165's required that a small amount be milled off to clear a header tube and flange.]



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 Posted: Sun Jan 14th, 2018 03:28 am
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As stated, the p heads are different in that they have different plugs, and require "P" specific headers. I've done a GT40P motor and a GT40 motor, both in mustangs, so header choices were more abundant.

Ultimately unless going for a sub 300whp build, I would opt for aluminum heads



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 Posted: Sun Apr 14th, 2019 03:31 am
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To get in this conversation late, I searched the web to find the E7 heads are reasonably priced.

But iron heads make better low end torque... I do assume reworked iron heads, but none the less they may work better on the street.
Most iron heads used to accept a Chevy 2.02 intake and a 1.60 exhaust... but things change.

AND what about the 351W heads, anyone doing anything with them; Ford has them in the old Power Book ?

Last edited on Sun Apr 14th, 2019 03:32 am by Scrambler82



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 Posted: Sun Apr 14th, 2019 04:43 am
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An all around good head is the roush Windsor jr head.



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 Posted: Sun Apr 14th, 2019 01:10 pm
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 Posted: Sun Apr 14th, 2019 03:25 pm
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I found out that the E7 Head IS the 351W Heads. (Pictures are good) !

When I did my first Stang, a '67 Fastback GT, I blew up the 390 that came in the car and went to a 289 Hipo, the 351W Heads I used, numbers unknown, were slightly ported on the exhaust side, had the 2.02/1.60 Chebby Valve and Roller Rockers, I'm thinking Crane or Insky, added a Crower Cam, Wham-Bam... a Chebby Killer.

If I remember correctly, the 351W heads were the precursor of the GT40 heads and with a little work would flow as well if not better.

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Large Tube Rear Axle, 31 Spline - FX4, 4.56 Gears, OX Locked
5" SuperLift, 33" x 12.50 x 15" BFG ATs,
Hurst Shifter w/Longer Replacement Shift Handle with (Homemade) Mounting Adapter; 1.5" up x 1" back.
Backrack mod'd to fit Steppie, Front and Rear Bumpers by Custom 4x4 Fabrication, OK.
Working on more Mods, just need more time, longer days would work !
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