madkaw

I'm not sure I buy into the balance tube= lazy idle. If you remember my set up ,I had/have a separate vacuum log with all the associated hoses and my throttle response and idle was like a motorcycle. Never had an issue with a 'lazy idle', but have a Mikuni intake tapped at all the runners.

I would try a different starter first or just try the reduction starter. Definitely check all connections .

Beautiful set up Mike!

I think it will be hard to tell by hand. My last ZX motor only showed 90lbs by hand on a compression test. Once apart I realized it was in very good shape. Leak down test for sure. True motor head has an engine in the living room:)

Okay- took cam and towers off the warped head and popped them on the rusty head for a fast dirty test and the cam spun fine. So took everything back off the head and sent it to the machine shop for a pressure test. If that passes then it's time to play valve swap. I took everything off the warped head because it all looked clean and hopefully serviceable. So the only parts that will be used off of the rusty head is the core itself and the Rocker base nuts. I think they will be fine with a little cleaning. Got a new valve spring compressor and it works pretty dam well. Had the valves out in just a few minutes.

And I thought only P79 and p90 got that close of a shave!

I'm with Stanley on the windshield. Unless you have to have a windshield that says Nissan on it, buy a new one. Seeing clearly is a great thing. I would spend the money on suspension. Try doing stuff yourself to save money and still have a reserve if you need someone to bail you out. Handling is what these cars are about. Keep your eye out for an L28 that someone sis getting rid of cheap and jump on it and keep it for a rainy day. Have fun!

It's all relative I guess. Your running 32cc's on flat tops?

Zed, the bent one is high in the middle. I really do plan on trying to straighten it out a bit first before thinking about milling. When you are starting with such a small chamber you are limited with the shave fix. I'm looking at 11 to 1 now without shaving. There is too many variables that I need to research first before I know what exactly what route I am going yet. Waiting on a CC kit to see how much I can gain in chamber volume with some unshrouding.

I have to get the rusty one pressure checked before I endure that work. As rusty as it is I will want to change out everything including rocker studs. I'm betting they will put up a fight

The way my luck is going , my L24 will be done for next summer.

Welcome from an ex New Jerseyian.

I am going to try it, but after I verify the rest of this head is good. Had to go to work to pay for all this, so I will look into that when I get back!

What pistons and rings did you use? Stock cam? What valves- stock size?

Captain, Too much warpage + small chambers makes it not doable. Zed, I've read about swapping cam and towers, so might be an option , but I'm doubtful. Cliff, I talked to them before (Hoke), and seemed nice, but didn't want to ship a cylinder - sight unseen- because of the mess I'm in. I might take you up on looking at some heads if I get to that point-thanks.

Well #2 MN47 head came and it's junk also. This time I will have to fight for my money back. I will post pics but the cam was rusted into place. I called as soon as I opened the box. I called A1A in Lakeland FL and the guy proceeded to tell me I could just bead blast it and it would be okay. He's done that many times before. After cussing him out I called my CC company and refuted the charge. The crook won't take my money. I think the idiot-MIKE- really thought it would clean up. This thing must have sat outside for years.

Thanks Cliff. Maybe my engine has been cracked open before. It was pretty dirty inside like old used oil, but maybe there's nothing to that. I believe on these motors all the bearing caps not numbered are supposedly interchangeable.

I think it's about 7500$, plus shipping

Oh no-another red block in a Z :-o

Interesting.

I guess I'm crazy then-

A big oven, big piece of steel and patience.

I was actually amazed the guy just gave me a full credit-- sight unseen. The next one coming has a bent valve, but he guaranteed it would pass a pressure test. I might take a stab at straightening the head. I might as well since it is free. It will be my guinea pig head to practice unshrouding and measuring and cutting and......

Another MN47 is coming as we speak

Here's some more pics of the project, mostly of the L-28 that supposedly only had 100k. The cylinders looked great as I said, but a good amount of rust on the crank around the flywheel end. A very strong groove in the seal area that I think might be an issue. The issue being that the amount of surface rust across the whole surface doesn't allow for moving the seal much to avoid the groove. I think I will be installing a speedy sleeve on there. Also interesting to me that the pistons all were labeled P79, I wasn't aware that Nissan did that. Am I assuming too much? Also asking(which makes me wonder if this engine was not touched) is the markings on the main bearings a normal numbering system? The machine shop said the block was straight across the top and I decided to reassemble the block with one piston to check deck height. Well it seems the rumors are true- about .019 above the deck. I guess I will be taking the block back to get shaved!!