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418 Headers
- Thread starter nlped
- Start date
Ourobos
Bronco Guru
Well on mine, which is in a Mustang, I run a 2" primary to 3.5" collector.. Don't think that's doable on the Bronco chassis. I think with your combo (Edelbrock heads probably being the limiting air flow factor), a good 1 5/8 to 1 3/4 primary and 2.5" collector should do the trick.. If you can squeeze a 3" in there, go for it. I'd keep it the same diameter all the way out regardless.
Ourobos
Bronco Guru
I'm jealous of both 
Yeah I'm having a hard time finding anything bigger also for you.
Yeah I'm having a hard time finding anything bigger also for you.
- Joined
- Nov 3, 2003
- Messages
- 51,619
Don't tell 'em I said so, but BC makes their shorties with the 1 5/8" primaries and Bronco Hut has their Sanderson-built headers available with 1 3/4" primaries.
Now, obviously those are shorties. If you're looking for longies, I can only steer you to the traditional companies like Hedman (Elite I think?) and Hooker (Super Competition I think?) for larger tube long tube designs that fit an EB chassis.
Or at least for some that you can modify to fit an EB chassis.
Friend made a wicked set of headers for his super-duper engine, by custom modying a set of Hedman Elite (I think that was the brand and model anyway) equal-length shorties for a Mustang to fit in his custom buggy chassis (mtfit's red rig now). Came out great, worked fantastic, and tucked in super clean into a single exhaust out the back. Don't know if mtfit's got any detailed engine shots of his, but he could confirm the make and model if needed. I think they came out great.
Personally, I believe that for most of us, the 1 1/2" primary is the perfect size for a Bronco-related engine. Even in your case as well, the smaller primaries of a shorty design are not a huge impediment to horsepower, as you can raise the tubing size much larger within 10 to 15 inches from the exhaust ports to get the expansion tuning that can benefit even a moderately built higher-revving engine.
I'll go back and read your cam thread to see the details, but if you're needing the larger initial primaries no matter what, and can utilize the shorty design, those others should work for 'ya.
That help?
Paul
Now, obviously those are shorties. If you're looking for longies, I can only steer you to the traditional companies like Hedman (Elite I think?) and Hooker (Super Competition I think?) for larger tube long tube designs that fit an EB chassis.
Or at least for some that you can modify to fit an EB chassis.
Friend made a wicked set of headers for his super-duper engine, by custom modying a set of Hedman Elite (I think that was the brand and model anyway) equal-length shorties for a Mustang to fit in his custom buggy chassis (mtfit's red rig now). Came out great, worked fantastic, and tucked in super clean into a single exhaust out the back. Don't know if mtfit's got any detailed engine shots of his, but he could confirm the make and model if needed. I think they came out great.
Personally, I believe that for most of us, the 1 1/2" primary is the perfect size for a Bronco-related engine. Even in your case as well, the smaller primaries of a shorty design are not a huge impediment to horsepower, as you can raise the tubing size much larger within 10 to 15 inches from the exhaust ports to get the expansion tuning that can benefit even a moderately built higher-revving engine.
I'll go back and read your cam thread to see the details, but if you're needing the larger initial primaries no matter what, and can utilize the shorty design, those others should work for 'ya.
That help?
Paul
00gyrhed
Bronco Guru
- Joined
- Aug 3, 2006
- Messages
- 2,428
Bet you dont really need it. Lots of torque and HP you will never use. Big primary headers dont really do much for you until you get your RPMs up. Even in a 418 1-1/5 primary will be fine for making low end torque and yea you will see some loss of top end but damn. My transmission shifts at 4800 WOT and my 393 get there fast. 4800 in 3rd gear is like 100 MPH. I pretty much have lifted by then. The 1-2 WOT shift happens almost as fast as it takes to put the pedal on the floor. 2-3 is scarry with that super areodyanmic body and raod and trtack oriented suspension. I have 1-5/8 primaries and 3" collector shorties from a mustang I altered to fit the bronco. Buy a good set that will last and fit without giving you a lot of headaches and go on to something else.
Peak HP in my 393 occurrs at 4900 and I never need to go there and when i do its not there long.
I have 1-5/8 primaries and 3" collector shorties from a mustang I altered to fit the bronco. Buy a good set that will last and fit without giving you a lot of headaches and go on to something else.Peak HP in my 393 occurrs at 4900 and I never need to go there and when i do its not there long.
74strokerbronco
Full Member
niped do your heads have both the standard exhaust bolt pattern and the large wide pattern like the afr/darts etc. there are no large tube long headers out there without doing customs if you have the wide pattern and want to utilize them.
I don't think the eddy heads have the wide pattern.as stated the sanders or bc's would be the cheapest and easiest. I would say 1 5/8 minimum like the bc's.
if you want to tackle doing some customs use schoenfeld for flanges and one of their boxes of misc bends (in 1 3/4 tubes you get around 45 feet and enough bends to do nearly 2 sets) and a pair of 1 3/4 x 3.5" collectors for around 300.00 $. with my high reving 408 that's the route I ended up going but I had a set of duff's to copy for there pattern.
I don't think the eddy heads have the wide pattern.as stated the sanders or bc's would be the cheapest and easiest. I would say 1 5/8 minimum like the bc's.
if you want to tackle doing some customs use schoenfeld for flanges and one of their boxes of misc bends (in 1 3/4 tubes you get around 45 feet and enough bends to do nearly 2 sets) and a pair of 1 3/4 x 3.5" collectors for around 300.00 $. with my high reving 408 that's the route I ended up going but I had a set of duff's to copy for there pattern.
74strokerbronco
Full Member
dirtdonk I don't see any 1 3/4 primary headers at the hut.? I only see the set said to work with the p heads but does not even state primary size.? it's hard to use the 1 3/4 tubes with the stock narrow bolt pattern it can and is done but they have to pinch the tubes hard to get bolt clearance.
airbur
Bronco Guru
You don't need 1 3/4. I prototyped the huts 1 5/8 headers and they work awesome. Call Melissa and tell her you want Eric's headers
OP
OP
nlped
Sr. Member
- Joined
- Jun 4, 2009
- Messages
- 376
Hmmmm. I may build a set of custom ones if nothing more appropriate is available. I'd think the ones that DirtDonk recommended (1.75") would be best so far. Maybe the 1.5" or 1.625" may be okay, but this motor should be moving some air & I hate to lose power at the exit point... Displacement needs air... My Lightning GT40 couldn't move enough air...but 289 headers can!?!? I call BULL! come on folks.
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