Mark Maras

@jalexquijano Are you going to replace the seal or have it done by someone else?

Excellent. The hoses they sell are amazingly limber. I doubt their lines could or would ever cause a nozzle to bind.

@SteveJI've only purchased them with the rebuild kits in the past. However, item ZT20, fuel line, $8.00 ea., must be the bowl to nozzle line. I can't think of any other fuel line on an SU. I'm sure it's possible to mold a hose to the right shape. The question in my mind is, will the nozzle bind when the shape of the bend changes during the operation of the choke?

I wonder what Courtesy Nissan is asking for them. If it's considerably less, I'd take Courtesy's quote to the manager of that local dealership and tell them you'd rather support local businesses but their pricing policy makes that impossible.

@MartinoThere's a 75 280Z on Bring a Trailer that looks close to what you're looking for. If you can live with a 75 and a sun roof.

Silicone was my guess. That's what they feel and look like. I'm confident that ZTherapy's hoses are compatible with today's gasoline.

I've used the ZTherapy hoses. They're super floppy silicone (I think). They don't kink or bind up the nozzles during the choke operation.

They can sit in front of their Vanity mirror and ask "Who's the fairest of them all"? It's a wonder they never thought of driving a Furrari.

I'm a bit disappointed Biden didn't thank Trump for his part in the record voter turnout. He shouldn't have taken all the credit.

Just used one of those HF blasters with walnut shells to decarbonize the intake valves and ports on our son's VW turbo. It worked great.

I believe they're all the same. @siteunseen or anyone else what is recommended?

We need clues. As much of the who, what, where, why, and when as you can provide. "The game is afoot".

Was the throttle wide open during the compression test? If not, that would account for the low numbers. If it was wide open, I'd adjust the valves and test again.

Same here.

One possibility is back in the days of 327s, many old timers were still using non-detergent oil. If you didn't change the oil frequently, a massive amount of sludge would build up. I've seen it so thick that the head bolts were completely covered.

I'd try ZTherapy.

@S30Driver Just curious. Do you know what the difference was in the 1st and 2nd year turbo distributors? If the caps were the same I'm assuming the change was either the dist. shaft diameter or the height or both.

Interesting that you can raise the cap slightly and it runs better. I agree with ZH's advice about being sure the rotor is seated. I also wonder about gear wear that would allow the distributor shaft to raise the rotor slightly. Try grabbing the installed rotor and try raising it and the distributor shaft. While lifting it allow it to twist one way or another to get maximum height. There should be very little vertical motion in the distributor shaft.

To Carl.

I think the third pic is correct.

How many extension cords do you have?

@jalexquijanoOn this site search "valve guide seals". DAVEWM (as well as others) have good descriptions of the procedure to change the valve seals. You only have to remove one valve spring, #4 intake. Stuffing the cylinder with rope, using the valve spring compressor shown earlier in this thread, remove the valve spring retainer, lower the valve slightly, rock the stem back and forth to try to gauge the guide wear. If there is little to no sideways movement between the valve stem and the guide, use a straw to install the new (you'll probably have to buy a whole set to get one) seal and reassemble the spring. If there's considerable sideways motion of the valve stem, the head will probably have to be removed to repair that guide. Once again, before you buy a spring compressor and a set of seals, do your homework. Search this site and probably YouTube too. They have lots of videos. Should you decide to go ahead, you'll have the cost of a valve spring compressor, a set of valve seals and maybe a valve cover gasket. You might also check to see what a local shop would charge to inspect and change that one valve seal.

YouTube. Search, 240z valve seals. Pics of what you find would be helpful.

Hopefully it's just a valve seal.

You're good to go, reinstall it.