Guest Anonymous Posted February 9, 2002 Share Posted February 9, 2002 I am in the middle of a Turbo project and need to buy a P90 head to lower the CR, but I have found a P90A head, which is hydaulic, is there any modifiing I need to do to get the hydraulics to work,or is it even possible to do this conversion. I have a newly rebuilt 77 N/A engine in my 280Z. Any replies will help. Thank you, Mark Quote Link to comment Share on other sites More sharing options...
Len Posted February 10, 2002 Share Posted February 10, 2002 Mark Since you have a 77 L28 casting code #N42 you will have the dished pistons so you are halfway there. The P79 ,P90 and the P90a have the same chamber volume. The P90 and P90a are the more desirable since they have square exaust ports,high-quench chamber and steel seats. I believe the only difference between P90 and P90a is the p90a has a Hydralic pivot. I have a 83 280ZX Turbo with a P 90a head. I was first worried since Nissan no longer makes Hydralic pivots. Since then I found that Zbarn.com has allot of used pivots. I paid $15 a piece for some to replace a few loud pivots that didn't pump up or lost pressure after a while at idle. Hope this answers your question. Len Quote Link to comment Share on other sites More sharing options...
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