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Old 01-12-2011, 06:07 PM
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Ford 351 W head change

Got a set of GT40P heads to go on my 351 W engine. I replaced the pistons with flat tops some time back and had it balanced. To put these heads on what should I do as to port work brfore I put them on? Going to up date cam also. thanks for any help--

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Old 01-12-2011, 07:37 PM
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Well, i gotta be honest. I dont know. I looked on the net and I saw a lot of good info on allfordmustangs.com
Not too many ford guys here. They should rename it Chevy hotrodders.com

I am into pontiacs,i work on anything that burns gasoline.
Kinda sucks, it would seem if youre not talkiing about a chevy , no one seems to answer. I like fords, especially mustangs. I have a NASCAR F-150 and it has served me very well.
My classic is a 64 lemans (GTO)
I saw something on the other site about header interference with the spark plugs with the 40p heads vs. the 40 heads.a different style would eliminate the need to remove the headers to replace the plugs. I like to run double platinums in anything that is harder to install into than a 2.3 litre OHC pinto engine
Chebys are OK. They keep my tools from rusting.
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Old 01-12-2011, 07:45 PM
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Thanks for the up date--maybe some one who works ford will answer up. I shouldn't have any issues with plugs--I have clearence for them my issue was porting or not.
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Old 01-12-2011, 07:48 PM
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What I read was the 40p flowed better (slightly) than the 40,the only other comment was about the header/plug issue. I didnt read to far though.
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Old 01-12-2011, 08:48 PM
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I just wonder if port work would help or hurt these 40P heads?

also, anyone know of a web site where you can look up stock cam specs?
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Old 01-13-2011, 04:44 PM
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You might try this site. There are some people there that are knowledgeable.


http://www.stangnet.com/mustang-forums/classic-tech/
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Old 01-13-2011, 07:28 PM
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Besides minor port matching, you really don't have to do too much to a GT40P head. They do have a problem with spark plug to header clearance but not significant. You will need to open the head bolt holse to 1/2" (original are 7/16"). Depending on how you are going to use them, you might consider machining for stud rocker mounts rather then the OEM bolt down style.

This will give you an idea of how close the plugs are to the headers with GT40P - these are Sanderson:

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