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Patriot clippster headers - leaking flange

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My new Patriot clippsters (I think part # H8433-1) are leaking at #8 and possibly #7 (rear cylinders, driver side)

It started a while after I installed them. Replaced the gasket but same issue, so possibly the flange is tweaked.

Is this a known problem? Yet to pull the down pipes to see if they are placing tension on the headers although I put the system in by hand and it wasn't tight.

Heads are Dart Pro 1 alloy that have been slightly ported, but I don't know how far out they have been taken. No other holes are leaking.

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Good advice. I cut all flanges, as there was about 1/16" warp mainly on #7 & #8.

Have a slight choof now, I'm hoping as they heat and cycle they will pull in. I've got alloy heads so a bit wary of using a breaker bar to tighten the bolts to bring them in :)

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