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post #1 of 7 (permalink) Old 01-30-05, 03:45 PM Thread Starter
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Header Collector Size Question

Today I picked up all my 3" exhaust tubing and mandrel bends to upgrade my 2.5" stuff. I have 2.5" collectors on my Hooker Super Comps, but noticed that after the 4 primary pipes merge, the collector is about 2.75" and then goes up just under 3", then necks right down to the 2.5" size where the flange is welded on. Now, do I just get an adapter that bolts on to the flange that goes up to 3" or do I cut off my collector where its about 3" and put a 3" flange on it? I've read about the merge collectors but I'm guessing this wouldn't even be close to the same affect as them. Would I be better off to just put an adapter on to put a little restriction in there to help with torque or would I be better off to just go all out and make it true 3" all the way back? Thanks


1982 F100 2wd-408c CHI 3V 225cc Heads, 3v Intake, Pro Systems 1000+HP carb, 260/266@0.050 w/ 0.694/0.697" lift solid roller, JPT Rollerized c6 and 5000 rpm converter, 4.86 gears and S&W Ladder Bar kit with QA1's all the way around.
7.976@89.90 mph 1/8 mile with lots of bounce - with old engine and suspension(should be greatly improved)
1982 F100 408c 3v
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post #2 of 7 (permalink) Old 01-30-05, 04:12 PM
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Re: Header Collector Size Question

Just get a flange matching the one on the collectors and weld it to the exhaust. This the way I've seen many an exhaust done.

Brenden

XB Fairmont (street car) 11.07@123.02mph.
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post #3 of 7 (permalink) Old 01-30-05, 04:34 PM Thread Starter
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Re: Header Collector Size Question

Brenden, so you're saying to just leave it 2.5" and not worry about making the collector bigger?

1982 F100 2wd-408c CHI 3V 225cc Heads, 3v Intake, Pro Systems 1000+HP carb, 260/266@0.050 w/ 0.694/0.697" lift solid roller, JPT Rollerized c6 and 5000 rpm converter, 4.86 gears and S&W Ladder Bar kit with QA1's all the way around.
7.976@89.90 mph 1/8 mile with lots of bounce - with old engine and suspension(should be greatly improved)
1982 F100 408c 3v
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post #4 of 7 (permalink) Old 01-30-05, 04:45 PM
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Re: Header Collector Size Question

Quote:
Originally Posted by F100cleveland
Brenden, so you're saying to just leave it 2.5" and not worry about making the collector bigger?
I've got a vague picture in my mind. 2.5" at the collector sounds odd for a decent set of headers (extractors). I've only seen why-try's like that. I gather you have tri-y's? If so? Chop away and put the big collector pipe/flange on.

4-1's generally have a 3" or 3.5" collector. Mines 3".

Brenden

XB Fairmont (street car) 11.07@123.02mph.
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post #5 of 7 (permalink) Old 01-30-05, 04:51 PM Thread Starter
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Re: Header Collector Size Question

Brenden,
Trying to find a set of headers that would fit my application was a huge headache. The first set I had was the Sanderson Street Rod headers, but all they are is a set of glorified manifolds. They worked great, but on my quest for more power, I needed a set of full length headers. Mark McKeown and I talked it over and decided on a set of Hooker Super Comps for an 80-86 F-Series truck with 351m/400 in it. That also meant that the headers were designed for 2v heads. Mark adapted the 2v flanges to suit 4v flanges. So now I have a set of 4v headers that would work in my truck. They are made more for torque due to the 1 3/4" primaries into a 2 1/2" collector. But I'm thinking if I could make it a 3" collector, that would gain me some mid/upper range hp, plus the 3" exhaust with mandrel bends should really let it breathe.

1982 F100 2wd-408c CHI 3V 225cc Heads, 3v Intake, Pro Systems 1000+HP carb, 260/266@0.050 w/ 0.694/0.697" lift solid roller, JPT Rollerized c6 and 5000 rpm converter, 4.86 gears and S&W Ladder Bar kit with QA1's all the way around.
7.976@89.90 mph 1/8 mile with lots of bounce - with old engine and suspension(should be greatly improved)
1982 F100 408c 3v
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post #6 of 7 (permalink) Old 01-30-05, 05:04 PM
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Re: Header Collector Size Question

Sounds like fun. What your trying to do does work. My exhaust fitter (Barney's exhausts/Hallam Performance) has done it. He modify's headers etc all the time. Even makes his own it times. You'll be able to say your headers are 50% custom Go for it!

Brenden

XB Fairmont (street car) 11.07@123.02mph.
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post #7 of 7 (permalink) Old 01-30-05, 07:03 PM
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Re: Header Collector Size Question

My last exhaust set-up sounded same as this. They were 4:1's but reduced in size and then went up to 3inch to join the rest of the system. Happened that way from many cut and weld jobs over the years to the same extractors and different systems.

It's not really desirable and I noticed some big gains getting some new headers and doing it right.

Hope this helps.

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