Straight headers question - Chevelle Tech
Headers and Exhaust Discussion related to Exhaust systems and headers.

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post #1 of 12 (permalink) Old Apr 4th, 20, 1:15 AM Thread Starter
Scott
 
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Straight headers question

I am in the process of putting on mid-length headers and will need to drive it about 6 miles to a exhaust shop and have them extend my old exhaust to the new headers. I have heard that after turning it off there is a possibility that cold air can suck back into the heads and warp valves. I have always heard this and wondering if it is something I need to worry about.
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post #2 of 12 (permalink) Old Apr 4th, 20, 1:24 AM
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Re: Straight headers question

Based on the number of street cars that drop their exhaust at the track or run cutouts at shows and cruises Iíd says itís a wives tale.

Steve R
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post #3 of 12 (permalink) Old Apr 4th, 20, 1:28 AM Thread Starter
Scott
 
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Re: Straight headers question

Quote:
Originally Posted by Steve R View Post
Based on the number of street cars that drop their exhaust at the track or run cutouts at shows and cruises Iíd says itís a wives tale.

Steve R
Thinking the same as I have run long tube headers straight and never had a problem, just curious about the short headers.
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post #4 of 12 (permalink) Old Apr 4th, 20, 7:53 AM
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Junior Johnson lost several brand new 1963 427 Mystery Motors before he learned to stuff rags in headers every time engine was shut down. Never heard the theory outside his story.
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post #5 of 12 (permalink) Old Apr 4th, 20, 8:10 AM
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Re: Straight headers question

If they are mid-length I would be more worried about where the exhaust flames are going to be coming out. It one thing to have them come out under the car it is another thing for them to exit somewhere still in the engine compartment. Maybe you can rig a tube to at least get it out of that area.
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post #6 of 12 (permalink) Old Apr 4th, 20, 8:37 AM
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Rame
 
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Re: Straight headers question

It's usually more of a humidity issue with open headers, the cool air getting into the cylinder causing condensation and then rust (with full exhaust and a muffler to retain heat longer sort of fixes this issue). It's really not much of a problem for your situation, the only thing to worry about is if you get stuck in traffic and start getting sleepy it would be a good idea to open the windows and turn off the engine.

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post #7 of 12 (permalink) Old Apr 4th, 20, 8:51 AM
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Jeff
 
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Re: Straight headers question

No worry.. Enjoy hearing the heart of that motor... You might want to wear ear protection if you have tinnitus, I always hear that ringing from years of hot cars, motor cycles and construction work..
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post #8 of 12 (permalink) Old Apr 4th, 20, 8:52 AM
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Re: Straight headers question

It wonít be a problem.

I first heard that back in 1971 when putting a straight pipe on my Honda. It had a snuffer on it...a cool little plate with holes in it inside the end of the pipe you could turn it sideways to quiet it down.

I donít like being manipulated!
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post #9 of 12 (permalink) Old Apr 4th, 20, 10:45 AM
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Re: Straight headers question

In the eighties I had a '70 Chevelle wagon that I put headers on and had to drive it about 20 miles with no exhaust to a shop that put the dual exhaust on.
It was one of the funnest drives I've had.
I remember when I passed a cop on the road trying to ease off the throttle enough to make it quiet but not so much that it started to pop and make a racket.
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post #10 of 12 (permalink) Old Apr 4th, 20, 10:47 AM Thread Starter
Scott
 
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Re: Straight headers question

Thanks for everyone's replies, I didn't think it was a problem but thought I'd ask.
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post #11 of 12 (permalink) Old Apr 4th, 20, 7:28 PM
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if you can put your mufflers in the back seat, it saved me a couple tickets when I was driving my 66 or 67 Fairlane GT 390 to a shop in the 70's, pulled over a couple times within roughly 10 miles lol


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post #12 of 12 (permalink) Old Apr 5th, 20, 11:22 AM
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Re: Straight headers question

I remember driving my 81 z28 with a 454 4 speed,open headers, to the muffler shop 20 miles away,7:00 in the morning,being young and foolish i never short shifted her, i do remember the paint peeling of the floor pans,but had to much of a headache to care.haha.Never had any engine issues.

1970 ls-5 numbers matching
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