blue72

I called arizonazcar a couple of months back, and he's been sold out of the pistons for a while, but was looking to find a replacement in the future. I believe MSA sells a forged 87mm kit though.

I had the exact same problem. Anything over 1/4 throttle and it won't rev above 4k, but under light throttle it revs all the way. Then driving around under load it would stumble occasionally, and generally not run like I wanted. It turned out to be my distributor. I replaced everything, even swapped the motor (not because of this problem, just for more power), etc... but when I switched to a ZX dizzy with the E12-80 module it fixed all of those symptoms and I have had a big smile on my face since.

Check out the performance tips section of datsunzgarage.com He's got a good recomendation there.

Thought I'd chime in with some photo reference of an N-42 head I recently pulled from a '75 280Z. Not quite sure why anyone would need an exhaust gasket that's larger than the port though.

I'd be a little worried about the door plate being held on with phillips head screws myself. It'd be nice to see the vin on the firewall too.

Yeah, you can feel the missing bits of the wall with a fingernail, in fact, you could file your nails down with it. I like the idea of a sleeve, but would I need to order that from Nissan, or would a reputable machine shop have the capability to make one for it? Thanks for the idea. I'm planning on pulling the block back out this weekend, and dissasembling it, then I'll know if the #1 piston is still salvageable.

First time post here, but I can't find the answer I'm looking for elsewhere. I have searched extensively in past forums, but to no avail. I purchased a used '81 F-54 block with P-79 head last week, and when I tore into it I found something very disheartening on the cylinder wall in piston #1. I took some pictures, but they're impressively large, so I'll link to them. http://www.renderanything.com/Vehicles/Pitting01.jpg (the orange fibers are from my shop rag) and http://www.renderanything.com/Vehicles/Pitting02.jpg All of the other 5 cylinder walls look great with the original crosshatching on them, and this one appears to be fine further down in the bore. The gentleman I purchased it from has been in business with Z's many a year, but he purchased the engine from a third party having never run it himself. It apparently ran, but was pulled in a resto, and the guy lost interest. From what I could see it still had the original head gasket on it, and the coolant showed no signs of oil contamination, or vise versa, but now I'm unsure what to do. I didn't want to make this too long, but wanted to explore my options. I know it'd be foolhardy to try and use it as is, but I was wondering what might have caused this? Metallurgy?? Detonation? As is I will probably have it bored .1 over, get new slugs, and reuse the rest of the good stuff on it. My hope is that something like this won't happen again further down the line though. Let me know your opinions, and if you've ever seen this on a L series block before.