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Discussion Starter #1
Well, I thought I fixed it, but it came back and haunts me while driving. I replaced the manifold-downpipe gasket, sealed it nice and snug. I took out the header and inspected it, no visible cracks found at all.

I did however notice that where the manifold bolts up to the engine, I used a brand new OEM gasket, that where on cylinder 1 exits, the gasket is square and the header comes down at a curve, exposing the gasket. I can also check on the header a "dummy" o2 sensor was put into the hole and may try for my o2 wrench and ensure that its secured well in there without stripping it.

Any suggestions? Go back to stock manifold perhaps?
 

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well switching back to stock manifold and seeing if the problem persists will rule out the manifold for you
 

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Discussion Starter #3
I just torqued every bolt down, found 2 studs that were loose. So I tend to believe that the header-engine gasket is ka-put! It sounds like its dead on where that cylinder 1 is on exhaust port. Looks like I have something to do tomorrow besides tonight's Z32 (fairlady twin turbo) work :(
 

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its all worth the headache, just in case anyone else has that problem
 

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Discussion Starter #5
yeah, I will get to it tomorrow morning, picking up part in a few minutes for the new gasket and going back to stock, tsk tsk ;(
 
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