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As a noob I felt left out of conversations about different ZX heads --- until I found these pages:

http://datsunzgarage.com/p90/ *details P79, P90, P90a

http://www.viczcar.com/forum/index.php?topic=6012.0



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I believe P90 and 90a came with 280zx turbos.

All 3 have same chamber design.

P90a has hydraulic lifters for quieter operation.

P79 has exhaust liners to shape the flow.

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