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So I recently saved a 92 Z34 from being crushed. The yard said the guy drive it in but thought it had a blown head gasket. If it does, it's unlike any I've ever seen. No unusual white smoke, not even after sitting all night, will idle without overheating, I can even drive it at highway speeds or WOT. There's also no oil/water mixing. Overheating only happens if I don't let the car get to operating temp before pulling off then it seems to level out with no further issues. I did a tune-up: plugs, wires, valve cover and plenum gaskets, because there's a stumble and slight "sputtering" feel sometimes when starting off or quick acceleration. I've checked fuses and relays and burped it also confirmed no leaks. At this point, I'm not sure what else to check other than the thermostat. I was planning on that today but had to order it. Any other ideas? Also concerning the thermostat, I always thought lower temp options were best, especially for that engine, but the salesman said no.

Thanks! It's on it's way and he should get it by Tuesday.

Thanks for doing this, it's a lot of fun to dig into! Mine is one of the 342 triple white '95s. and it has the LQ1. It must be one of the early 1995 convertibles - built 8/15/1994 VIN ending in 301870. There can't be many of these left.