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Re: Small Update...

Don't worry. If you run turbo pistons with the N42 or N47, you will only be dropping compression to 8.3:1, creating a standard 280z motor.
The only time you get comp. in the 7's is when you use dished pistons with a P79/90, those heads had much larger chambers to work with the flattops .
So if you use turbo pistons with the N42/N47, expect 8.3:1.

But running a hot cam on a motor with 8.3 comp is going to kill the bottom end torque. My vote would be to stay with the flattops and find a way to get the compression above 9.

My 10:1 comp L28 with flattops and ported P79 runs perfectly on 93 octane, but pings like there are marbles inside the block when using 89.

My Vote:
Keep the flattops/N42, keep timing stock at 8btd, and use the best gas you possibly can.

Bryan
The Datsun Z Garage
 
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