Where can I find 2.5" Copper Collector Gaskets for 2-bolt flange?

ONLY for ADVANCED technical discussion about the 240sx!
jtsarnak
Posts: 121
Joined: Wed Nov 27, 2002 7:51 pm

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I have a hotshot header into a high flow cat, and the they have 2.5" inlet/oulets. The regular gaskets are burning out in a matter of months so I want to get copper gaskets but I can't find 2-bolt style copper gaskets in 2.5" anywhere. Can anyone help me out?


HeavyDuty
Posts: 1281
Joined: Tue Sep 23, 2003 4:51 pm
Car: 1995 Infiniti Q45
95 Nissan 240SX S14
96 Nissan D21
06 Nissan 350Z Z33

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Try 300TT catalytic converter gaskets, *slight* trimming on the holes, but a multi layer stainless gasket, should seal fine.

jtsarnak
Posts: 121
Joined: Wed Nov 27, 2002 7:51 pm

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You mean OEM Nissan gaskets for a 300ZX Twin Turbo or some aftermarket company's?

HeavyDuty
Posts: 1281
Joined: Tue Sep 23, 2003 4:51 pm
Car: 1995 Infiniti Q45
95 Nissan 240SX S14
96 Nissan D21
06 Nissan 350Z Z33

Post

Stock Nissan OEM 300TT cat gaskets, they have an elliptical 'V' channel to the sealing surfaces, two layers per gasket, IIRC.

The ID of the hole is more like 2.25, which is more like your HS header & cat inlet, right? (Just the distance between the holes is 2.5", but the opening is smaller) Big a$$ flange, small hole.

Buy one & try it, if it doesn't work, I'll buy it from you, I use them all the time on many different applications.

Also, if it's a Random Tech high flow, you'll need to weld the floating flange in its' correct orientation (from the back side of the flange) for a total seal irrespective of the gasket. Too hard to perfectly center the gasket on the protruding lip of the cat stub itself.

If it's a non-floating flange, then go for it.


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