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Old 09-09-2013, 10:27 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, 10:50 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, 11:35 AM
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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, 11:40 AM
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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, 12:04 PM
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Why not just move the whole engine and trans over a bit, towards the drivers side. Move the engine mounts and trans mount.

Last edited by F-BIRD'88; 09-09-2013 at 12:30 PM.
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Old 09-09-2013, 12:07 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, 12:17 PM
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Cut off all 4 tubes right near the cylinder head flange. Shorten all 4 tubes by say 1/2" and reweld onto the cylinder head flange. When you cut off the 4 tubes leave a stub at the flange. When refitting the 4 tubes to the flange stubs. expand the 4 tube ends a bit so they slip over the stub ends on the cylinder head flange and reweld.
The check the straightness of the gasket surface. If it is warped now resurface on a big belt sander,
This will move the whole header including the collector 1/2" away from the frame rail.
Why did you not check the header fit-frame clearance while positioning the engine mount frame tabs locations?

you can use a exhaust pipe expander tool to expand the ends of each of the 4 cut off primary header tubes.
(local "Midas" exhaust shop). You only need to expand the end a little bit so it can slip over the flange stub.
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Old 09-09-2013, 12:27 PM
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63 to 80 corvette SBC headers should fit that chassis.
82 to 90 Fbody car long tube headers should fit that chassis.
Both these sit closer to the engine.
What car application are those headers for?
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Old 09-09-2013, 03:39 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, 03:49 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, 04:02 PM
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ogre, good call!
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Old 09-09-2013, 04:12 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 09-09-2013, 04:13 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
If you are eating header flange gaskets often it is a sure sign of incorrect ignition timing expecially at idle,, and incorrect carb set up.
This makes the exhaust ports and the headers run way hotter than needed and burns the gaskets up and warps the flanges so they leak.
Fix the engine tune and you header gasket problems will suddenly dissapear.

Fix the timing and carb and get the header flange planed so they are flat again.
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Old 09-10-2013, 12:54 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, 01:10 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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