GT40P heads??

daviszx3 · Sep 14, 2008

i have 1 gt40p head and was thinking of buying another n doing a h/c/i swap and was wondering how do these heads compare to others wht kinda gains could i c from these?? thanks n advance

MikeROD16 · Sep 14, 2008

to be honest, you are better off with the regular heads. The P heads will give u very little gain. Besides, if u buy the P heads, You will need to buy the headers that go with it, i believe mac and ford racing sells them. but its in the 300 price range. and they are shorties. or you can look for longtubes that have good spacing so the spark plugs will clear (which must be 90 degree boots). the P's are a hassle IMO. i would stick to gt40's.

85_SS_302_Coupe · Sep 14, 2008

MikeROD16 said:
to be honest, you are better off with the regular heads. The P heads will give u very little gain. Besides, if u buy the P heads, You will need to buy the headers that go with it, i believe mac and ford racing sells them. but its in the 300 price range. and they are shorties. or you can look for longtubes that have good spacing so the spark plugs will clear (which must be 90 degree boots). the P's are a hassle IMO. i would stick to gt40's.

I dunno....don't the Ps have smaller combustion chambers, or do i have that backwards? If so then that's a little extra compression (i'd have them milled down anyways though). The whole idea behind the spark plug angle is that it points the plug to the center of the cylinder and gives better spark...that makes better power. It's a small difference but every bit adds up. Also if you already have full lengths then i wouldn't sweat it, pretty much every full length i've seen will work with Ps.

MikeROD16 · Sep 14, 2008

yeah the combustion chamber is different which is where the extra power is gained from. but idk, if he only has one hed and nothig else, it isnt worth it. look for regular gt40's in the explorers or mountaineers earlier than 97.

Mr. Rustypwnz · Sep 14, 2008

yeah the combustion chamber is different which is where the extra power is gained from. but idk, if he only has one hed and nothig else, it isnt worth it. look for regular gt40's in the explorers or mountaineers earlier than 97.

that is NOT where the power id picked up from... The P head is completely different exhaust ports and angles than the regular gt series and e7 garbage...

stock for stock gt40p heads are cheaper, and make more power than gt40's its a fact of life...

MikeROD16 · Sep 14, 2008

like i said, it does make extra power, but its alot more of a hassle. ive seen the flow charts, its not too much of a big deal. gives you some thing like 10-15 hp.

cenok is family · Sep 14, 2008

MikeROD16 said:
like i said, it does make extra power, but its alot more of a hassle. ive seen the flow charts, its not too much of a big deal. gives you some thing like 10-15 hp.

10-15hp is a pretty good difference. if a particular mod shows to net you 25rwhp or 40rwhp, which would you choose?

MikeROD16 · Sep 14, 2008

yeah but would you rather pay the extra money on headers and spark plug wires when that money can be invested in other good uses.

Mustang5L5 · Sep 14, 2008

If he needs headers anyway he's going to have to buy them eventually.

The FMS headers are quality peices. My BBK's are rusting to hell, and my replacement headers will be the FMS shorties.

GT-40P's with the upgraded TFS valve springs, and a TFS stage 1 cam is a pretty stout combo. I know of someone trapping 105MPH with those heads cam and a Cobra Intake and 65mm TB

85_SS_302_Coupe · Sep 14, 2008

Another point that should be made is that the P specific headers will work on any Ford head, so it's not like you can only use them on P heads. If i ever go back to shorties i'm getting Ford's P specific stainless headers...they're very nice quality pieces.

MikeROD16 · Sep 14, 2008

thats true. but Mike, if they are powdercoated, would they still rust??

Mustang5L5 · Sep 14, 2008

Which headers?

The FMS headers are ceramic coated. I've installed 2-3 sets of these on friend's cars. They fit perfectly, sealed perfectly and even a couple years down the road they still looked new.

My BBK's are just chrome. They are 5 years old and look like crap. I could prob powedercoat them or something, but I want the Ford headers..so now i need to buy headers.....again.

If i knew what i knew now, i would have bought the FMS headers and called it a day.

MikeROD16 · Sep 14, 2008

yeah. well, personally i would get longtubes cuz i like the sound they give. In mustangs unlimited, they have a set of longtubes for around 120 but they are only painted black. I think thats a good move if he gets the P heads. but what i meant was if you powdercoat headers, do they rust?? im not too sure but im believing that they dont.

tiptop · Sep 14, 2008

ya, but then if you get long tube headers, you will need a new h-pipe cause the long tubes wont fit on to a normal h-pipe.

85_SS_302_Coupe · Sep 14, 2008

I haven't seen a powdercoat that'll hold up on headers yet. Even ceramic coating isn't rust proof, a lot of them will get light surface rust and rust down in between the primaries where they meat at the collector.

My buddy got a coupe earlier this year that has FMS shorties on them and they look fantastic. The kid said he got'em 3 years ago.

lang williams · Sep 14, 2008

my friends 67 fast back has a set of jet coat coated headers on it. they still look perfect 10 years later. it's only driven to car shows an on nice weekends so that may not be a true indication.

red95gtconvert · Sep 14, 2008

Say what you want about the P's but I can tell you from personal experience they made a huge difference in the midrange and topend on my car, granted I already had a Cobra intake and headers/exhaust but the gain is definately there if you have the supporting mods

SMOKEDYA · Sep 15, 2008

I got the GT40P's with MAC L/T's the plugs are easy to get to! Maybe because i have the "special" headers?I dynod 301HP338TQ at the wheels with these heads and my car has gone 12.2@112MPH. peace

john

25thmustang · Sep 15, 2008

Our P headed car runs strong... they are a good budget head.

Mr. Rustypwnz · Sep 15, 2008

Our P headed car runs strong... they are a good budget head.

yeah ive never had a slow running p car..

GT40P heads??

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