Stainless Works Header Warped - ZR-1 Net Registry Forums

Dynomite · 11-29-2015

I was going to respond to this with essentially what Marc described. I have two sets of SW Headers and to get that flange straighter/flatter than what is described by Dmod81 or perfectly straight would be almost impossible without planning the flange surface on a milling machine after it is welded up. The Flanges are relatively easy to press to the Head exhaust surface with the Header Bolts and I am sure after a few runs get HOT enough to reduce the internal bending stresses caused by the Press Fit (Bolting).

I would not describe the issue as Warped SW Headers but rather a normal tolerance associated with welding on a jig table which is of no significance when bolting the rather flexible flanges to the inflexible Head Exhaust Surface. This is a situation of Close is Good Enough and .045 inches is pretty good

Dmod81 · 11-29-2015

Thank you all for the replies. I will continue on with my install. Then on to the corsa install.

On a side note- I found no less than 12 leaks in my old exhaust on the front cat welds. Also found that the installer blew through the pipe while welding it up (trying to weld it up?). There was slag and some welding rod welded to the inside of the passenger cat.

Marc Haibeck · 11-30-2015

Yes, that's a normal flange on a Stainless Works header. They are all like that and I have never had a problem with a leak. Tighten the bolts from the center to the ends three times.

HAWAIIZR-1 · 11-30-2015

Quote:

Originally Posted by Marc Haibeck

Yes, that's a normal flange on a Stainless Works header. They are all like that and I have never had a problem with a leak. Tighten the bolts from the center to the ends three times.

Okay, thank you. No issues with my original set of SW headers back in 2003 and I don't expect issues with the set you modded for me; I will check before install out of curiosity.

11-29-2015	#1
Dynomite Join Date: Aug 2009 Location: South Dakota/California Posts: 3,817	Re: Stainless Works Header Warped I was going to respond to this with essentially what Marc described. I have two sets of SW Headers and to get that flange straighter/flatter than what is described by Dmod81 or perfectly straight would be almost impossible without planning the flange surface on a milling machine after it is welded up. The Flanges are relatively easy to press to the Head exhaust surface with the Header Bolts and I am sure after a few runs get HOT enough to reduce the internal bending stresses caused by the Press Fit (Bolting). I would not describe the issue as Warped SW Headers but rather a normal tolerance associated with welding on a jig table which is of no significance when bolting the rather flexible flanges to the inflexible Head Exhaust Surface. This is a situation of Close is Good Enough and .045 inches is pretty good __________________ Clickable links On Iphone Touchable Links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 11-30-2015 at 01:27 PM.

11-29-2015	#2
Dmod81 Join Date: Mar 2010 Location: Colorado Springs CO Posts: 76	Re: Stainless Works Header Warped Thank you all for the replies. I will continue on with my install. Then on to the corsa install. On a side note- I found no less than 12 leaks in my old exhaust on the front cat welds. Also found that the installer blew through the pipe while welding it up (trying to weld it up?). There was slag and some welding rod welded to the inside of the passenger cat.

11-30-2015	#3
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 255	Re: Stainless Works Header Warped Yes, that's a normal flange on a Stainless Works header. They are all like that and I have never had a problem with a leak. Tighten the bolts from the center to the ends three times.