is the flage welded or is it loose. I'm converting my exhaust from the 85-type 4 bolt flange to the later 2-bolt flange. The 85 type flange is welded so it cannot be rotated but on my new flowmaster setup (3", single in/out) the I-pipe end fitting if flared indicating that the flange to the cat is a "loose" piece and not welded like my stock exhaust is. If the later flange is indeed loose then I will have to get one to make it a true bolt on.

I'm sure a lot of people know if the I-pipe to cat flange is loose or welded on the I-pipe.

James

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1985 Z-28 305 TPI 223,000+ mi., Original Eng.,T-Tops,Blue/Grey
STB,SFC,GW "wonderbar",145 Speedo

 

On both my '87 and '89 IROCs this flange is 'loose'..........

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Phil87IROC
Blue '87 IROC, 383 Crate Motor, KB pistons, AFR 190 heads, ZZ-9 cam, Edelbrock RPM intake, Hooker SC/LT headers, Edelbrock 750 cfm Carb (#1411), stock T-5, GM 3.42 rear w/Auburn posi.
Ohio Valley Dragstrip Trophy Bracket WINNER - 8.39 ET on a 1.82 sec. - 60'. Best MPH = 84.44. Still Tuning Carb!
Red '89 IROC L98, 700R4, T-Tops, K&Ns w/open air boxes, 160 T-stat, Hyper Chip, gutted MAF, 53kv coil, MSD wires.

 

On the cat itself the flange is not moveable, on the I pipe it is loose so it can be rotated to line up w/ the flange bolt holes on the cat.

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

 

thanks, that was what I was looking for.

James