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Old October 14th, 2018, 01:56 PM
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headers

I am looking into header situation, and came across, https://www.ebay.com/itm/OLDS-CUTLAS...-/182850971141

I like the look but what about performance
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Old October 14th, 2018, 03:27 PM
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They are not headers, doubt there will be a performance increase.
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Old October 14th, 2018, 03:27 PM
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Originally Posted by Mcolabella View Post
I am looking into header situation, and came across, https://www.ebay.com/itm/OLDS-CUTLAS...-/182850971141

I like the look but what about performance
I’m going to test those as well someday.
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Old October 14th, 2018, 03:33 PM
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Originally Posted by oldcutlass View Post
They are not headers, doubt there will be a performance increase.
they look less Restrictive then manifolds though
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Old October 14th, 2018, 03:35 PM
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90* intersections do not make for good flow and the number 8 cylinder actually goes against the flow.
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Old October 14th, 2018, 03:54 PM
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Cosmetically they look better than stock manifolds but I doubt they perform any better. Most people believe they would be a waste of money.
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Old October 14th, 2018, 04:21 PM
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Well if anybody has tried them I would be interested know how the worked out, still like the look
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Old October 14th, 2018, 05:13 PM
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One of the members here bought an engine from Thornton that had them on it when he got it, probably the one in the picture. Don't know how they worked out.
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Old October 14th, 2018, 05:29 PM
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they also offer some decent shorties...at least they should perform better than those tubular"accidents"

saw them on their facebook page
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Old October 14th, 2018, 07:14 PM
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Who makes the shorties the same company?
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Old October 14th, 2018, 09:42 PM
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Originally Posted by Mcolabella View Post
Who makes the shorties the same company?
Yes, they are just coming out.
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Old October 14th, 2018, 09:43 PM
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yes its thorntons. they also showed up on ebay but vanished again. they offer the SB version though.

https://www.ebay.com/itm/1973-1974-1...75.c100623.m-1
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Old October 14th, 2018, 10:37 PM
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No bbo versions,
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Old October 15th, 2018, 01:09 AM
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I want a set now since I have the old ‘headers’.
Just saw these on eBay from Thornton. They are for sale now in two different finishes.
https://www.ebay.com/itm/OLDS-CUTLAS....c100935.m2460



https://www.ebay.com/itm/OLDS-CUTLAS....c100935.m2460

Last edited by 67CSConvert455; October 15th, 2018 at 01:21 AM.
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Old October 15th, 2018, 06:46 AM
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The collector merge on those 455 headers looks less restrictive than their 350 headers. Either way, a good product introduced.
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Old October 15th, 2018, 07:25 AM
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I like the look of them, the dull finish
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Old October 16th, 2018, 02:25 PM
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There have been many tests over the years shorty headers V long tube headers on non Olds engines. The long tube headers have been a clear winner its not even close.
The stock 442 manifolds from the big blocks work okay 68-72. If you are looking to make HP above stock level long tubes are the way to go.
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