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GT40P Bronco Hut Headers
- Thread starter pennyduke
- Start date
Broncos n' VWs
Sr. Member
- Joined
- Nov 6, 2005
- Messages
- 360
Those look great! I'll have to consider these when I cross the "motorswap" bridge.
- Joined
- Nov 3, 2003
- Messages
- 47,641
I wonder with all the talk of the exhaust ports being the choke point all these years, why they went and made them even smaller during the last hurrah of the engine?
The P heads are actually supposed to make more power, and certainly burn cleaner (I think the main reason for the changes), but strange that it does so with even smaller exhaust ports!
I wonder if they were trying to get more velocity to compensate for something?
Guessing too that they only cared about lower rpm running in Explorers, as opposed to max breathing.
I've seen flow charts, but will have to look again to see what's up at the higher rpms ranges.
I know mine is wicked responsive from off-idle to 3500 rpm or so, but with the stock cast-iron Explorer manifolds it definitely falls on it's face at higher rpms. I can't wait to try headers someday (without modifying the head at all) to see what kind of a difference I can "feel" from the seat.
Enjoy yours for sure! Let us know how they run. And REV!
Paul
The P heads are actually supposed to make more power, and certainly burn cleaner (I think the main reason for the changes), but strange that it does so with even smaller exhaust ports!
I wonder if they were trying to get more velocity to compensate for something?
Guessing too that they only cared about lower rpm running in Explorers, as opposed to max breathing.
I've seen flow charts, but will have to look again to see what's up at the higher rpms ranges.
I know mine is wicked responsive from off-idle to 3500 rpm or so, but with the stock cast-iron Explorer manifolds it definitely falls on it's face at higher rpms. I can't wait to try headers someday (without modifying the head at all) to see what kind of a difference I can "feel" from the seat.
Enjoy yours for sure! Let us know how they run. And REV!
Paul
Paul,
I have the non p-heads on the 347 with the BC headers and a not so great flowing 2 into 1 system. It's the 35-349 cam and an autolite 4100. It can climb a grade in 2nd gear at 1000 rpm and it quickly bounces off the Rev limiter set at 6200 if you get into the skinny pedal. I actually think a little less cam would be good for my combo but it's still torquey.
I belive that last version ford was looking for torque and with the small cam and exhaust it did well. If you read up on the mustang sites where the gt 40 heads make real power close to aftermarket heads is with careful exhaust porting.
On the headers the BC wildhorses and Bronco hut headers all have their strong points. I went with the BC in the end to use their head pipes and likes the stock ish style no gasket flange. If going bigger than a 347 that you want to rev I would go with the bigger tube and ceramic shorties for better clearance and temp controls under the hood.
Sent from my SM-G900V using Tapatalk
doghows72
Bronco Guru
- Joined
- Jan 5, 2005
- Messages
- 2,036
Gaskets?? I have those headers as well and they are made by Sanderson. They recommend using high temp silicone around each port, let it dry then install. They told me the headers would leak if you use a gasket??
Anyone had any trouble using the gaskets and having leaks? They sure would be a lot easier than that mess I made using the silicone they recommended.
They are very nice though. I also used the WH steering shaft Alison a very nice piece!
Anyone had any trouble using the gaskets and having leaks? They sure would be a lot easier than that mess I made using the silicone they recommended.
They are very nice though. I also used the WH steering shaft Alison a very nice piece!
sykanr0ng
Bronco Guru
- Joined
- Aug 11, 2014
- Messages
- 5,363
Strangely enough the GT40P head engines have a torque peak 100RPM higher than the non-P head engines.
That is comparing stock Explorers with stock Explorers.
I might try the RTV next. I had small leaks with stock gaskets and now I'm using mr gasket dead soft aluminum but still got a few spots leaking. I may retorque them first after I get this dang Samurai out of my shop.
Tim
I did a lot of searching before I decided to use the GT40p heads. Most threads were from the Mustang forums. Many people are still using them and making tons of torque and HP. Engine builders are saying that improving your heads is the best way to make gains to any motor. Make sure to upgrade the valve springs and get the Bronco Hut Headers.
At this point, I have only completed the break in on my motor, So I can't tell you how it performs. But it sure does sound good with those heads,Thumper Cam, and headers.
At this point, I have only completed the break in on my motor, So I can't tell you how it performs. But it sure does sound good with those heads,Thumper Cam, and headers.
Eoth
Bronco Guru
- Joined
- Mar 10, 2004
- Messages
- 1,678
I used gaskets and everything is fine.
- Joined
- Nov 3, 2003
- Messages
- 47,641
Difference in what? Overall performance? Fitment of headers?
Assuming you mean performance, but I'm not sure I've ever read here of a member simply bolting a set on without doing all sorts of other things that would have skewed the results completely.
Are you running headers and exhaust now, or is it all stock?
The old advertisements for the Ford Motorsport version of them in aluminum claimed an immediate 40hp increase over a stock head. Never specified what year stock head, but that was the common number used back then.
You might not feel a 10hp increase by the seat of your pants, but it's hard to hide a 40hp increase!
I have P heads on my '68 and the entire engine is stock Explorer. Cam, exhaust, induction and virtually all smog components intact.
It feels like it could run circles around any other stock Bronco I've driven from back in the day. But that's not completely apples-to-apples either, because this one is geared completely differently too, in the tire size/gear ratio department.
Mixed reviews is what you get. Always.
Everyone has different ideas of what works, different levels of experience, and even different levels of sensitivity to such things.
And that's not including the huge number of differences in Broncos and driving habits.
Good luck though. Personally I think they're worth it if you're not ready to go with an aluminum aftermarket cylinder head at this point.
Paul
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