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post #1 of 26 (permalink) Old 07-22-2011, 09:37 AM Thread Starter
 
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Header Opinions needed

Looking for opinions on going back to original cast iron manifolds on my non- Ram Air 1971 GTO? For anyone with experience, what are the pros and cons of original cast exhaust versus after market headers. I am having the engine pulled and painted and will be replacing the current rusty 15 yr old Hedman headers. I would like something that will hold up cosmetically and perform well.

Forgive if this is an overdone subject.

Thanks in advance.

Dan
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post #2 of 26 (permalink) Old 07-22-2011, 09:55 AM
 
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Originally Posted by jigaway View Post
Looking for opinions on going back to original cast iron manifolds on my non- Ram Air 1971 GTO? For anyone with experience, what are the pros and cons of original cast exhaust versus after market headers. I am having the engine pulled and painted and will be replacing the current rusty 15 yr old Hedman headers. I would like something that will hold up cosmetically and perform well.

Forgive if this is an overdone subject.

Thanks in advance.

Dan
Hey Dan,

Well here ya go.
Pros
Fitment - These cars were not built to accommodate headers, and neither were the heads.
Clearance - Your exhaust will not be as likely to bottom out on you.
Flow - If you get the right exhaust manifolds, they will flow as well or better than most aftermarket headers.

Cons
Cost - A good set of manifolds, the desirable ones that flow well, ain't cheap.
Looks - It's harder to keep stock manifolds looking pretty under the hood.


That's all I can come up with off the top of my head. I think you have chosen wisely.
Scott
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post #3 of 26 (permalink) Old 07-22-2011, 10:16 AM Thread Starter
 
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Thanks Scott. You are echoing what the professional engine guy advised me on. He said the Hedmans that are on it were a bugger to get on.

Which are the ones that flow well and arenít cheap ??

If I'm doing this, I might as well do it right. My goal is to have the engine compartment more or less back to stock but still have some high performance.

Dan
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post #4 of 26 (permalink) Old 07-22-2011, 10:24 AM
 
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Oh heck that's easy.
Ram Air III IV V
High Output
Super Duty

Any of those stockers are killer exhaust manifolds. Some are made re-production. But again, can get kinda spendy.
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post #5 of 26 (permalink) Old 07-22-2011, 10:40 AM
 
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You may want to try ramairrestoration (DOT) com
They have RA and HO manifolds in reproduction that are quite nice. I will probably go that route too.

Good luck.

Scott
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post #6 of 26 (permalink) Old 07-22-2011, 12:07 PM Thread Starter
 
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I looked at the RAs on ramairrestoration.. Nice, and not too bad a price until you drop 199 extra for coatings! Wonder if worth it to keep it pretty.

Dan
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post #7 of 26 (permalink) Old 07-22-2011, 02:01 PM
 
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The coating IS worth it! Eric



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post #8 of 26 (permalink) Old 07-22-2011, 03:56 PM
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Well, just to offer a lightly different slant. While it's true that manifolds will fit better and will be more durable than any header, a good header will make more power than any manifold. If that weren't true then you'd be seeing manifolds on race cars instead of headers.

The decision to be made is whether or not you're willing to put up with the aforementioned fit, clearance, and longevity issues in order to get the most power you can get out of your engine.

Bear

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post #9 of 26 (permalink) Old 07-22-2011, 05:55 PM
 
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tell it like it is. Headers on a vintage car driven on the street through mufflers in stop and go traffic and even highway speeds, you do not get the full benefit of the header. on the track, uncorked, sure, but on the street with stock gearing and typical rpm, as shown by the car magazines is not there. along with the leaks, clearance, better to go with HO ram air cast manifolds and exhaust system to match.
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post #10 of 26 (permalink) Old 07-22-2011, 06:13 PM
 
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Headers and stock manifolds both rust and look cruddy after a while. Coated headers stay good looking longer than both. I have the Tri Y's and they hit everything, PITA.. Dougs headers fit great and look good from what others have said.

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