Which Thornton exhaust would you choose?? Headers OR Exhaust Manifolds...

[JAMCAR223]

Thornton's Small Block JR Exhaust Manifolds | Thornton Muscle Cars

Here is a high performance exhaust manifolds that GM never produced. We have designed and produced what everybody was asking for; true dual exhaust cast iron manifold. This is the performance solution instead of headers. Features: Large 2 1/4" outlet on the driver and passenger side manifolds...

www.thorntonmusclecars.com

Oldsmobile Small Block Headers | Thornton Muscle Cars

Our very own Thornton design; a direct replacement for an exhaust manifold.These headers are polished 304 stainless steel, with a 1/2" thick steel flange, to prevent warping. Option for ceramic coating available for an additional $175.00 Please read the details below to ensure this is the...

www.thorntonmusclecars.com

Oldsmobile 408" small block - 9.5/1 compression - stage1 mild ported heads w/ large valves - Edelbrock Performer Plus 204/214 cam - Edelbrock Performer RPM intake - Holley Sniper Stealth fuel injection - 2200 rpm converter - 3.08 gears

Both will be an upgrade to stock exhaust manifolds. Both will work with my 2.5" Jegs dual exhaust ( some of you will remember the stainless kit we got on sale 1.5 years ago ). Stainless headers might look a little nicer. I can always coat or hi-temp paint the manifolds. Cost is not the determining factor... Reliability is. Anybody have either one of these products??

 

[fleming442]

Personally, I'd go manifolds because I think the the shorty headers are totally cheeseball looking.

 

[DRIVEN]

Manifolds

 

[pontiacgp]

I like the headers and with 1/2" flange they won't be leaking or blowing out a gasket

 

[lilbowtie]

Keep the stock duals, you won't gain anything.

 

[84dragcutlass]

Manifolds, unless its at the top end you wont notice a difference between high flowing dual exhaust manifolds and shorty headers

 

[olds307 and 403]

It is a tough one. If you do go manifolds, take some time with a dremel and clean up the castings. Another very good fitting option but needs custom down pipes, has 3" collectors, is the Sanderson shorty headers. About the same price as the Thornton shorties coated. I like the Thornton shorties except the dented tube, it has to be restricted by it. That tube should have been moved till it touched the other tube, it would have made the flattening less of a flow killer.

 

[84dragcutlass]

It is a tough one. If you do go manifolds, take some with a dremel and clean up the castings. Another very good fitting option but needs custom down pipes, has 3" collectors, is the Sanderson shorty headers. About the same price as the Thornton shorties coated. I like the Thornton shorties except the dented tube, it has to be restricted by it. That tube should have been moved till it touched the other tube, it would have made the flattening less of a flow killer.

Ah the old dented header topic, i would have thought the same thing until i saw the episode of engine masters where they literally dented the living crap out of a set of headers to the point that you would literally think they wouldnt flow anymore and it made absolutely no difference in power what so ever. Interesting stuff, its worth a watch

 

[fleming442]

Ah the old dented header topic, i would have thought the same thing until i saw the episode of engine masters where they literally dented the living crap out of a set of headers to the point that you would literally think they wouldnt flow anymore and it made absolutely no difference in power what so ever. Interesting stuff, its worth a watch

It's amazing how many myths they bust (and prove/explain) on that show. There's a few episode that I wish they went a little deeper, but fascinating nonetheless Numbers don't lie.

 

[lilbowtie]