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Old 09-09-2013, 11:27 AM
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Consequences of Modifying Headers

I did a trial fit of my engine and transmission onto my frame today and ran into an issue with one of my headers not fitting (please see image).

What are my best options for fixing this issue?

Cutting the pipe in half where the header hits the frame, then fabricating a connector to expand the diameter of the pipe to original size? Would this affect the headers in a noticeable way/ defeat the purpose of installing the headers?

Worst case scenario I still have the original ram horns, but I'd prefer not to use them.

Thanks for the help with this rambling question.
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Old 09-09-2013, 11:50 AM
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looks like you could pie cut your collector just enough to tilt it in from the frame
pie cut the inside and remove material or pie cut the outside and add material
either one would work
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Old 09-09-2013, 12:35 PM
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That's a great idea. Can't believe I didn't think of that.

Thanks for the help.
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Old 09-09-2013, 12:40 PM
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Or just heat it up and work at it with a hammer, no cutting then rewelding needed.
So far as consequences, so long as it is all sealed up, there arent any with that small modification. Good luck!

peace
Hog
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Old 09-09-2013, 01:07 PM
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When faced with needing clearance in the past, with the header still bolted to the heads I have placed the header under tension using a winching strap or a come along, then heated the 4 tubes in a convenient place to make a uniform place for them to gently bend. Increasing tension as needed for clearance and heating uniformly without blowing through the thin tubing.
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Old 09-09-2013, 04:39 PM
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ramhorns work well in front of low restriction mufflers for regular street performance.
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Old 09-09-2013, 04:49 PM
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as often as i've had to replace my header flange gaskets, i'm thinking of going back to ramhorns
i have the stock 283 set, but speedway motors has some nice 2.5'' ramhorns for cheap that i may use
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Old 09-09-2013, 05:02 PM
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ogre, good call!
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Old 09-09-2013, 05:12 PM
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Quote:
Originally Posted by ogre View Post
as often as i've had to replace my header flange gaskets, i'm thinking of going back to ramhorns
i have the stock 283 set, but speedway motors has some nice 2.5'' ramhorns for cheap that i may use
Ogre, I always file the flanges of any header before I install it. Even cheap headers will seal and not have gasket blow out problems if you do this.
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Old 09-10-2013, 01:54 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
Fix the timing and carb and get the header flange planed so they are flat again.
ramjet350 w/ mefi4 controller, gm crate motor. maybe i need better gaskets.
napa has the same part number for all sbc manifold/headers
going to put a new ss exhaust sytem on the truk next spring,
still thinking the ramhorns will work better
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Old 09-10-2013, 02:10 PM
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I would bend them, as FirstLight7 said still attached to the heads with a strap or come along. Get a couple Mapp gas torches and you should be set.
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Old 09-10-2013, 02:31 PM
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Had this same scenario on a car I built, and I did what Ogre initially mentioned. I used a parting wheel to separate the collector just below the factory weld. Then I cut enough off one side to allow the collector to til inward, and welded it back on. Tack it in place while they're bolted to the engine, and it will hold it so you can remove them to do the finish weld.
As for headers leaking, I stopped using all the useless header gaskets that are "high performance". I went back to using factory metal laminated stock type gaskets, and all my leaks have ended. Used to change the gaskets about every 6 months to a year, and now I never change them.
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Old 09-10-2013, 05:50 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
those engines are notorious for incorrect fuel curve
and a over rich idle. I be the timing curve especially at idle is WAY OFF what the engine really wants. Retarded timing equals over heated exhaut and gasket issues every time.
Was just going to mention this.

Here is a stock Ramjet 350 on the MEFI and then a Ramjet 350 with with an 0411 PCM with an optimized calibration.

212rwhp/265rwtq


311rwhp/334rwtq


Avoid the 2" outlet Ramshorns, go with the 2 1/2" aftermarket units as "real" 2 1/2" Vette units can be pricey.

I'd still do a decent header over any rams horn though. IMO

peace
Hog
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Old 09-10-2013, 06:40 PM
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The MEFI controller was actually for boat engines.Idle & cruise are always way rich.The 0411 is a big improvement.
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Old 09-10-2013, 08:18 PM
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mefi = marine efi controller and it gets 20 mpg at 80 mph. i'll leave it rich
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