Has anyone treid the gt40 heads with stock exhaust manifolds? Just curious....Was thinking of maybe clearing some stuff of my shelves
Stock exhaust manifolds are ONLY good as recycling material.
It *may* work but you'll just choke a bunch of power out of the GT40P heads, which would make it a waste of time ;)
I know those heads use a manifold that looks like a cut up and hacked up stock mustang headers. And with the angle of the plugs I don’t know. But like they stated above why waste your time. Money can’t be an issue there’s someone always giving away stock stang headers or for cheap same for the h-pipes,
There is a reason for everything! I have headers (for gt4oP)and an x pipe to put on if I wanted to later ...However I have a little bet going on Hooptie vs hooptie. My xr7 vs 99 crown vic..So I need it to appear stock..For now. I even have an extrude honed upper and lower which made 314rwhp on my stang....So I think I can do it..I would perfer to besat him by quite a bit..I may try some porting of the manifolds..But I dont know
It has to be stock?Your car should beat his without the new heads then.If you DO decide to install the heads,and use factory exhaust manifolds,you may need to install new plug boots on the spark plug wires to help clear the manifolds.Are you guys going to be inspecting each other's cars?I don't see what would kill you by installing the headers and X-Pipe.How do you know his is totally stock?Installing the Extrude honed parts and heads is pointless without the exhaust as well.Just leave the car stock until you're ready to do it all the right way.That's a lot of work just to prove you can outrun a Crown Vic.....which in my opinion,doesn't really leave anything to brag about anyway.
All I really need to do is find out if the factory manifolds will clear. Restrictive as the wanna be dual exhaust on my car is its staying for now. If the gt40p dont clear I have a set of gt40's I can use. I can always do the exhaust later if I like. But for now it will be what it will be
Use the GT40s. They have the same ports and valve size as the Ps. The only difference is the sparkplug angle.
Bruce I know..I also thought the GT40P had a smaller exhaust valve . Flow numbers are different as well
Thats new to me. I worked at a machine shop for seven years and never noticed any difference in the two.
I am trying to get ahold of a gt40 explorer engine instead....But I WISH I KNEW THE ANSWER!!!
Iron GT40 1.84 intake valve, 1.54 exhaust valve.
Iron GT40P 1.84 intake valve, 1.46 exhaust valve.
The GT40P has a better flowing chamber so Ford could use the smaller exhaust valve yet still get the same flow out of the head as a Iron GT40 with a 1.54 exhaust valve.
That I knew however it seems there is still the debate on whats better...... Me I have no idea
But what I reallly wanted to know......WILL MY CAST IRON MANIFOLDS WORK!!!!:O)
Head flow chart.
P's also have a slightly smaller combustion chamber....
Doubt it, with the P's plug angle.:D
I know a set of hipo 289 early stang manifolds work on P heads..But will ours. I have a chance on getting either a gt40P or gt40 explorer engine..Id rathe rget the P if it's better however the gt40 engine will be a no brainer and the intake will have the EGR
If you take Stock Mustang manifolds/headers and massage the tubes in a little you can run them on P heads with 90* boots. Local guy was trying to sell some, they fit, I just wouldnt swap head to run choked exhaust.
So after much reading it seems the general consensus is to def go with the P head....I can get either motor for the same price. $450.....Now if I have to go splurge on P headers I am going to be fuming..Especially if they are mounted to a factory HO H pipe and the factory 88 xr7 lers and pee shooters...... YES I WOULD DO THAT!
If you go w/ an explorer motor you’re going to wana change the cam. Keep it simple stay away from the p’s. But you’re going to have another problem nobody here put the p-head on the E6 motor there is a guy here that put the GT 40s on but didn’t mill.
My advice for an ultimate sleeper to beat your friend. Right of the bat your lighter then him so equal HP you win. He’s around 195hp. so you take an entire mustang E7 drive train motor and tranny and transplant. No hide it put on your stamp steel valve covers and plenum plate. Port the hell out of your exhaust manifold and that will restrict you the most of the 225 hp you should be getting. But unless he looks at you firing order he will never tell. And swaping a whole motor can be just as hard as doing heads especially if you might have clearance issues.
If it were me, $450 is alot to pay for if your just going to get heads. I bought e7's from a junkyard for about $35 each, and would have went with gt40's if they had any. Prices might be different there, but for $450 you could have the whole mustang engine setup almost.
I would also get the gt-40's over the p's because you *should* be able to run your current exhaust setup. They should have the same plug angle, so you should be able to run them as is.
I am getting the complete explorer motor for $450 with a 1 year warrenty. I can get the gt40 explorer motor also but the p heads are better. And I am putting in the factory HO mustang cam in. Seems to be a nice stock idleing nice power combo from what I read. Also changing valvesprings locks and retainers.
My buddy will have no idea what hes looking at and I wont be popping the hood anyway. I just want it to sound stock which is quiet for my own personal amusp00get.
Ill end up telling my buddy what I did eventually and may at some point in the future do the exhaust.
Ive seen stock gt40P engines with the HO cam putting down 260rwhp plus...So Im confident whatever I get out of this it will be more then enough....But well see
Then for under $1000 I will be racing his 305rwhp Marauder....And if I beat that hes going to kill himself bahaha..I have a nitrous kit to take care of that.
And if anyone local needs e7 heads..I have plenty
I was actually originally going to do the HO part sswap....But for $450....Its a steal in my opinion
Do any of you guys in Long Island have stock manifolds I can borrow?
personally, if your really planning on upgrading the motor, the heads are the most expensive part. I would get good heads over a nitrous kit. If you already have it thats one think, but a good set of heads will grow with your combo if you ever want to further it.
Explorer motor not only has the gt40 or P heads but also the cast gt 40 explorer intake 65mm tb. so for 450..AN explorer motor is a bargain..Thats why I am going this route. There is nothing I wil do after this..Thats it!
well good luck. Smart choice with the H.O. cam btw.
Below in my sig click on my link to my motor picks if this guy can’t tell your spark plug angle he’s might not get the difference of an explorer intake. Just put on the stock plenum plate it bolts on and don’t paint it.
where on long island are you
Im in Queens by the Whitestone bridge. I really want to get the P headed motor however getting headers and new exhaust isnt in the budget now regardless. So if the manifolds work with P heads great..If not I may just pu tteh kabosh on this...Or get the gt40 motor