Zed Head

He's only going to get about $50-100 from a wrecking yard. The engine trans and diff would probably be worth picking up as a set. It only takes one of them to be good and the buyer is probably paid back. Buy those and let him scrap the rest. Even a set of good injectors, a fuel rail, and an FPR might make it worthwhile. A garage full of spare parts gives comfort. @Terrapin Z is a collector and has been known to travel.

Might be some recommendations in here. Seems like wheel bearing grease would be fine.

How about a bad valve seal? And, the oil rings scrape oil, the compression rings create pressure. You can have a bad oil ring with good compression rings. A possibility. This is an old California Datsun engine, maybe Datsun Parts LLC. Quality was suspected from the start. I'd put that hotter plug in and just drive it.

AV8ferg just went through the same thought process, almost exactly.

Did it run? Is it complete? Carbs, manifolds, etc.? I'd add a few more pictures than just the serial number and head casting. It's neat but if the guy with the car it came from isn't out there, it's really no different than a later E31 headed L24. No offense. There's only one car that will be "numbers matching". 2776 is the number.

If you're trying to save money on your rebuild and you have kept track of which rocker arms match which cam lobes, you might want to just use the cam in the best condition. Also, the 74, and maybe the 77, might be spray bar cams. No internal lubrication holes. So that might be a factor. The specs for all of the cams are similar as you can see in Jeff G's chart. There are no "hot" cams. Here's the P79 data if you want to take some measurements. Just from the picture it doesn't look it's been reground. Don't lose or throw away any of the small parts, like lash pads. They're expensive when you consider that you have to buy 12 each. Getting hard to find sizes also.

Bees against murder hornets. https://www.yahoo.com/huffpost/honey-bees-kill-cook-murder-hornet-113739412.html

The question of the definition of "friction modified" has come up before. The label doesn't say "modifier" it says modified. So, not the same as friction modifier for a clutch type limited slip differential, which is modifying the slippage between clutch discs, not synchro rings. Besides that "modified" just means different. It doesn't really say which way or how the modification is happening. But, besides all that, and what "friction modified" actually means it just boils down to the fact that people have tried it and compared it to the "normal" transmission oils and it works a lot better in removing the poor synchro perfromance. Redline MT90, Synchromesh, and Synchromesh Friction-modified all work very well. Also, Swepco 201 blended with ATF works very well also. Better than Valvoline 80W-90 manual transmission fluid. I don't think that anyone really knows exactly why one works better than another. It's magic.

Are you looking at the AC chapter? The hoses actually have small labels taped to them with letters that show where they go.

Found a video if you decide to dig in to them. This guy posted here for a while but now has his own web page. Some pretty good stuff on it. http://woodworkerb.com/home/datsun-240z-rebuild/datsun-240z-mechanical-fuel-pump-rebuild/

Found a dyno run with numbers, in the title. Apparently it's the factory system. But he doesn't show the numbers with the FAST system. Don't know why he doesn't put it on the web site page. He has a bunch of videos on his account. https://www.youtube.com/channel/UCAvjCjvssZ_1BcTC1Rdx69A/videos

Here are his youtube videos. They're half off the page on my computer on his web page so I thought I'd link them here to make it easy. It will produce an engine that runs. 8 seconds of engine noise. No dyno sheet. Installing...

There's an old discussion about it on the forum. People wanted to see an engine with the system installed and the engine running, maybe even a driving video. Never heard back. Basically, it looks neat but there's no evidence about how it will actually do with the L6. It might be as bad as the L-Jet system with a big cam. Who knows, no way to be sure. If I was marketing that system I'd install it on an engine with a big cam to show what it can do, and make a video to prove it. Found it -

EuroDat explained it in the post below. There's a spring inside the 280Z style slave cylinder that takes up all of the play at the clutch fork. It can't apply much force, it's a small spring, but it is there and it does work. If I was checking that theory out I'd crawl or reach under the car with the engine running and move the fork away from the pressure plate by hand. You can reach it from the engine bay also. You might have to have someone sit in the car to listen since the noise is amplified in the cabin. Here's the FSM drawing. I put a red dot under one of the spring coils.

I think that this was a good idea, below, and it's telling about the valve quality. Maybe you can find an old Nikki pump. Pretty common to have to fix new aftermarket parts.

Does the filter run dry while the engine is running?

oops

You can't make this stuff up, it's real. Live and Let Die. It's not even the McCartney version.

I think that the heart of the problem might be the bad valving. Have you checked pressure, and capacity?

We're back to 2000 deaths. And the WH is shutting down or minimizing the task force, apparently. This is the new normal. It's part of the background noise now. https://www.worldometers.info/coronavirus/

Here's an area where you might be able to actually have an impact. In your back yard. Get out the vote! Stir things up. https://www.spencerfernando.com/2019/12/18/while-trudeau-government-eliminates-canadian-coal-industry-federal-agency-invests-141-million-in-chinas-coal-industry-blacklocks/

Stop posting the pointless videos. See my edited response above your reply. Assembled in USA or all parts made in USA? Let's check that out.

But you'll still take the paycheck for traveling to China for work? Nothing you own was made in China? But, back to the original question, modified - what response are you expecting from your videos? The virus is here, no matter where it came from. How will knowing where it came from affect any of a person's actions? It won't change the hot spots. It won't change the need to wear a face covering. It won't change "stay at home" orders. It won't change any planning a person might be doing. Nothing will change "on the ground"' here in the US, or anywhere in the world.

You might try some experiments, moving the lever by hand, to see when in the stroke the pump actually moves fuel. There might be too much play at the beginning of the stroke. Could also be that the leaky valves inside allow too much fuel past on each stroke. If the problem is play, you could stack some gaskets to create a thinner spacer, to take up the play.

We're just having an absurdity contest... The truth is that the virus did come from animals, a bat-like humanoid. The flying monkeys in the Wizard of Oz were real, they were man's first attempt to create a flying human, experimenting on monkeys because their DNA is so close to humans. The bats that were used for the cross-breeding have escaped in the past, and now they've ended up in the Wuhan "wet" market. With proper nutrition certain COVID-19 patients will grow wings.