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How about the old standard of mixed up firing order? Just watched a pro do that. It happens.

I happen to have a complete E30 head that I have never been able to sell, quite a niche market for sure. I’m in Western Canada, send me a PM if you want to discuss getting it to you.

Hi guys, this week i sold my 240z! It needed a good service as the engine leaked some oil, the body needed some work and.. i don't have the energy to work on it i will now concentrate on the engineroom of the 280zx i had restored in the past years.. I kept my self made mahogany steeringwheel and gave the new owner the rear wheel arches that i had stored on my attic with the car and some other nice parts to make an nice driver car for every day. As you can see in this pic the car has glassfiber rear arches and they are not original. As i said, i will now with some help of a friend, going to work on my almost ready 280zx! He also helped to get the lighting ready in my carport as he is a electrician as i am also! I finished also the air to air heat pump in my garage, so we can work on the 280zx coming winter. It was a bit difficult to let the 240z go but i had it for 27 years, and drove it for 25 years! It was a blast!

Probably not your issue, but thought I would share. I had an issue with my white Z where it ran great driving to a show 20 miles away and then horribly on the return drive. Cylinders 2 and 3 were bad. I was convinced it was fuel and wasted a couple hours rebuilding and then replacing the front float bowl shut off valve. Eventually I took off the valve cover and saw that the #2 and #3 valve rocker arms had 'relocated'. The end that was supposed to depress the intake valves was no longer touching the valve. Long story short, took the head to the machine shop and was told the valve stems were all gummed up from running old/bad gas. Sadly, I do not drive the cars enough. Anyway, put it all back together and it runs great now. Machine shop cleaned all the valves and guides. Fortunately, no damage was caused to anything except for my wallet. You can see the two valve 'nicks' on cylinders 2 and 3 in the pic.

Correct firing order? 1-5-3-6-2-4 CCW?

Do they have good grounds? Have you tried to bench test them?

I think that I saw that or something similar on PBS or one of those channels. It was more focused on the main guy with the mustache. Rick Hall. Pretty fascinating show. https://en.wikipedia.org/wiki/Rick_Hall

Here's the Franklin Mint model.

I'm a big fan of having a vacuum gauge on the balance tube (and plugging the emmissions holes). If the engine isn't healthy, it doesn't matter how the carbs are tuned. Compression, Timing, then Carbs. The vaccum gauge is a wonderful tool to see the health of the engine. I

Pre-Fleetwood Mac Fleetwood Mac.