Mcolabella

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

oldcutlass

They are not headers, doubt there will be a performance increase.

cutlassefi

Mcolabella

they look less Restrictive then manifolds though

oldcutlass

90* intersections do not make for good flow and the number 8 cylinder actually goes against the flow.

redoldsman

Cosmetically they look better than stock manifolds but I doubt they perform any better. Most people believe they would be a waste of money.

Mcolabella

Well if anybody has tried them I would be interested know how the worked out, still like the look

oldcutlass

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.

EightballZ

they also offer some decent shorties...at least they should perform better than those tubular"accidents"

saw them on their facebook page

Mcolabella

Who makes the shorties the same company?

olds 307 and 403

Yes, they are just coming out.

EightballZ

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

Mcolabella

No bbo versions,

67CSConvert455

olds 307 and 403

The collector merge on those 455 headers looks less restrictive than their 350 headers. Either way, a good product introduced.

Mcolabella

I like the look of them, the dull finish

Bernhard

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.