Downpipes for Thorton manifolds?

olds307 and 403 · Jan 18, 2019

Are you thinking of Sanderson headers? Yes, they do have aftermarket cast iron headers, just whether they fit a G body.
https://www.google.com/url?sa=t&sou...FjAAegQIBxAD&usg=AOvVaw0dRvE26ur1i8aFffVCvDGe

Hi-Fi · Jan 18, 2019

You guys are right, I misread the listing on the Thornton headers. Good thing I wasn't buying at 2am!

Sbc G body is a common swap but from my research most go with floor shift. I want to maintain column shift and I changed from a 3 speed that my car was setup for to a 2004r. I also welded ball flange collectors on my headeds not realizing it would cause clearance issues with the linkage bar, it's just in the perfectly wrong spot. They fit ok, it's just they required a lot of tweaking to various compenents.

I had to heat and beat the headers so they weren't pushed up against the lower control arm mount and pushed up against the frame. They're stainless steel OBX headers, I believe replicas of Dynapros.

Hi-Fi · Jan 18, 2019

Also think I can adapt this to my car which would solve my issues.

https://www.opgi.com/monte-carlo/G2...l3hdOtj1RmAjwNNU_AlgLJ4-C39WrGhQaAgy6EALw_wcB

gnvair · Jan 18, 2019

Try the Gen 2 LT1 manifolds. Those should work on a G body and potentially clear the linkage.

TURNA · Jan 18, 2019

KCP said:
Do the Corvette style ram horn manifolds fit in a gbody without too much of a hassle?

No the way they run the exit comes down right on the K frame

FluoFerret · Jan 18, 2019

KCP said:
Do the Corvette style ram horn manifolds fit in a gbody without too much of a hassle?

nope, they are center-dump and will never clear the frame-section below the engine. i borrowed some from a friend to try, and you would have to cut and reweld a lot on that frame-section.

FluoFerret · Jan 18, 2019

gnvair said:
Try the Gen 2 LT1 manifolds. Those should work on a G body and potentially clear the linkage.

But they are not square-shaped ports if I remember well. that could cause some serious trouble with exhaust leaks...

KCP · Jan 18, 2019

FluoFerret said:
nope, they are center-dump and will never clear the frame-section below the engine. i borrowed some from a friend to try, and you would have to cut and reweld a lot on that frame-section.

TURNA said:
No the way they run the exit comes down right on the K frame

Bummer, they're plenty on the market here from 70's Opel Diplomat which came with Corvette 327 / TH400 combo.

gnvair · Jan 18, 2019

FluoFerret said:
But they are not square-shaped ports if I remember well. that could cause some serious trouble with exhaust leaks...

You could port them to correct the shape. Look at the link I provided earlier. They explain what needs to be done.

Hi-Fi · Jan 21, 2019

Decided to cut the ball flange connection off and weld in a 6" long sleeve. Then I took a torch and mallet to the sleeve to make it a oval. Reinstalled the headers and the linkage works great after tweaking the attachment bracket some. It will even go to every gear even though the linkage and selector window is only for a 3 speed... At least P, R,N and D line up perfect! 2 is 3rd gear, 1.5 is 2nd and .8 is 1 🤣

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Downpipes for Thorton manifolds?

olds307 and 403

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Hi-Fi

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Hi-Fi

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gnvair

Royal Smart Person

TURNA

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FluoFerret

Greasemonkey

FluoFerret

Greasemonkey

KCP

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gnvair

Royal Smart Person

Hi-Fi

Apprentice

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