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I am planning on building an L28 for my '72 240z. I've done lots of reading, and of course have discovered the information on DatsunZGarage. I am planning to follow his setup on a P90/F54 (Which I already own) pretty much exactly. It is a pretty moderate build, and I'm not going to go overboard into performance. I try to daily drive the Z when I can, which includes a 100 mile commute. My main concern is pinging. Shaving the head 0.080" brings me up to around (Probably a little over, I don't know what size pistons I need yet) 10:1. With the P90's head design this shouldn't be an issue, but I am in California so I really only have access to 91 octane and I don't plan on using any octane booster. If this is CR even an issue, I'd rather just get the compression a bit lower from the start, than retarding timing and potentially losing performance that way. I understand how the camshaft and valvetrain geometry is kept in line with his setup, what I don't know is if I want to lower it a bit, how to go about that the best way (Say shaving just 0.060" instead). Like I said, I have done lots of reading, and have searched on here and haven't quite found my answer. This is probably more a question of general engine building than specific to the L series, but you guys likely know best and I figure it should be a fairly short and sweet answer. I'll try to get a thread together showing my progress with the car soon too, it's been a lot of work but I enjoy it, and I love my Z. Thanks!
