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So I bought a 1981 Datsun 280zx with a stock N/a l28e engine in it...OR so i thought. We tore this thing apart and found that it had an F54 block with an N42 head, BUT, with dished pistons. So I'm not sure if these are early n/a dished pistons or just a turbo block that has been changed to run n/a. Anyway, the original plan for this car was a low boost turbocharger upgrade. so i bought a P79 head for it, dropping the compression ratio to 7.8:1, compared to the factory 8.7:1 with the flat top pistons. I started a new thread because i haven't seen one thread that i can relate to with this Mix-n-Match motor that i have. My questions are: 1. Why do you think this block has been pieced together from many different years of Zs and using dished pistons for an N/A build? 2. how much boost would be safe to run with that compression ratio (7.8:1) provided my AFR is in a relatively stoich range? I have a wide-band for it so i can monitor the mixture and will have an intercooler, bigger injectors, etc. Thanks to those who take time to reply.
Hi Hybrid Z I bought an L24 E88 a while ago and I don't know what kind of compression ratio it should have. This block was taken apart and refurbished (it has assembly lube on the cam). l24's all had flat tops on them, but looking through the spark plug holes, this one has dished pistons. Asked the seller what has been done to it and he has no idea. I do not want want to take the cylinder head off, either since it's pretty much new. So I'm asking if anybody would know what could have been done with it. Has it been bored to 2800cc to accommodate the later l28 dished pistons? I wonder if it was built to be a turbo block. Maybe somebody has run into this kind of setup? Thanks