'90 yj header exhaust leak - JeepForum.com
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Unread 05-04-2013, 06:52 AM   #1
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1990 YJ Wrangler 
Join Date: Nov 2011
Location: Austin, TX
Posts: 7
'90 yj header exhaust leak


I have a 258 and replaced the exhaust manifold with a header. The gasket starts leaking about 2 weeks after install (3 times now . . .). I think the problem is due to the cast iron intake manifold and the steel header sharing the same bolts - they are different thickness and expand differently - ( seems like where this happens is where the leaks occur). Talked to the guys at Clifford Research (they make an intake manifold/header combo that have the same cast iron/steel that are different thicknesses as what I have) who say they solve this by using a bent flat washer to bridge the different thicknesses rather than a thick steel washer that is notched or stepped which is what I'm currently using. If anyone has been through this and solved it I sure would appreciate your advice.

I'm also curious if anyone has used the Clifford manifold and/or hi torque cam.

Thanks for any advice!

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