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I apologize to @Sean Dezart You had bad contact information.

Awesome, thank you!

Still don't know what's wrong with it? ;-) Every (good) carparts shop has them!

That was me that posted that photo to show him how a cracked or broken guide could cause an oil problem on one cylinder.

Are you kidding? This place is full of nuts.

I ordered one of these plates for one of my ashtrays that was missing one, very nice piece. Quite close to the OEM unit, the only difference I could see is the reproduction is a flat piece, whereas the OEM slotted plate has a small rounded lip around the edge, at least compared to my other ashtray. Both ashtrays are from mid-1971 cars, in that transition period between original series 1 cars and later ones, if that matters. Fitment-wise, the "blade" part sits a little bit lower than the OEM unit per the attached pictures, but overall I'm very happy with the replacement. My ashtray is also missing the spring clip on the outside that I need to figure out now, along with finding a replacement for the pitted chrome rings around the lighter hole. Thanks @Chris Holt for your efforts!

I have an l26 block, and the header fits no problem at all, even with SU heat shield and return springs. I also have the slightly older exhaust sectiom as I bought the header and exhaust at separate times, and it clears the R200 in my car as well. It is an expensive and awesome exhaust. I like it almost as much as the new S30 World door seals which I find myself wandering into my garage to simply open and close the doors to my absolute satisfaction!

He got back to me late last night (my time in CST). For some reason he had not received my previous email and is not getting notifications from this site so was unaware of the tags in this thread as well as the PMs. Thank you all for helping alert him that I was attempting to get in touch with him, this community is great!

Aside from replacing a part that meets Nissan specs, another factor to consider might be that used Nissan is probably better than new aftermarket.

It seems that's what you've been doing for the last decade and really aren't any closer to a solution than you were when you first recognized the problems. Unless you have a strong emotional tie to your Z, I suggest moving on to another car that you can enjoy driving with confidence that it will run well and get you where you want to go and back home. Just a suggestion that could make your life less complicated and more enjoyable. I once had a '74 Porsche that I never drove farther from home than I cared to walk back. I knew several AAA tow truck drivers by their first names. I was happy and relieved to finally sell it and eventually bought another that I've owned for 32 years.