madkaw

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!!

Disconnect it and see if makes a difference

Megasquirt is already installed if that's what your referring to. Have another head coming from Florida of all places. Keeping my fingers crossed on this one.

Correct. You can do it yourself(drilling) and it's cheap and pretty much what all engines use now. Flywheel is very stable.

Cliff, I believe the bigger the jugs, the better( I leave that alone-) A bigger bore would allow for more unshrouding of the chambers which would lower CR to compensate for bigger bores. The unshrouding of the head would allow for better breathing!

First set back-head is so warped that it's junk. Good news is the junk yard refunded my money and I get to keep everything! So now I have a head to experiment and cut up on!!

Cliff, Better in the fact it's about a bolt on with no real modifications, Worst in the fact of the small chambers gives you less control of CR . The P79 allows you to choose your CR based on how much you shave. They both have a great modern combustion chamber. And as Jeff pointed out; there are other options than swapping out valves to make the p79 work, i.e. adjustable cam sprocket. The slight advantage of the Mn47 , from what I've read, is that the head was designed with small chambers and the ports have a smoother transition into those chambers. Where as the P79 with it's tall chambers has a tighter turn to make it into the combustion chamber. I'm going for broke with a high CR motor. I have 93 and 94 octane around here in Indiana. 1fastZ swears that with good fuel control and ignition this combo works well running full ignition. I do have an advantage running MS. Not sure if this motor will see Mikunis mounted on it or FI right away. I have a stock FI intake coming USPS.