'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!