Guest Anonymous Posted June 23, 2002 Share Posted June 23, 2002 I currently have a P79 head on my car, How much better in terms of HP can I realistically expect to gain from switching to a P90 which I have had sitting around for about 3yrs. Any help would br greatly appreciated. Quote Link to comment Share on other sites More sharing options...
yo2001 Posted June 24, 2002 Share Posted June 24, 2002 probaly no enough to tell the difference unless you shave the P90 head. they are same chamber design with different exhaust ports. And the exhaust really doesn't matter far as performance. Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted June 24, 2002 Share Posted June 24, 2002 p90 has better ports but a huge combustion chamber for turbo.a ported p79 would be better on a na motor.i wouldnt machine a p90 down that far-you would have to put shims under the cam towers. Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted June 24, 2002 Share Posted June 24, 2002 I think a little more info would be nice. If your car is stock NA car, just leave the P79 on, or mill it some. The P90 will likely flow better, but on a stock engine, the difference is probably not worth the effort. Quote Link to comment Share on other sites More sharing options...
PETEW Posted June 24, 2002 Share Posted June 24, 2002 Yeah, I could buy the P90 from you and then you would have money to have your P79 shaved and worked on. I really do need a P90 head. I have a '83 turbo motor with the P90a head and I would like to change it so I won't have future problems (rebuild issues with hydraulic lifters). I figure it would be better to clean a head that I can keep. Thanks. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 25, 2002 Share Posted June 25, 2002 the thing is, I have a turbo 280Z which is putting a hurt on some of the local cars and I was wondering if the P90 would be better although my P79 has been worked on. Just running a bit over 8#'s and the car feels superb, can't wait til I really turn it up. Going to look at a spare motor hopefully this weekend if its there. Then we can talk about selling the extra P90. Quote Link to comment Share on other sites More sharing options...
DAW Posted June 25, 2002 Share Posted June 25, 2002 You didn't say you had a turbo until your last post...the P90 is a better match to the turbo exhaust manifold ports than is a P79. Since you've already got the P90, then you'd be better of with it than the P79. DAW Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted June 25, 2002 Share Posted June 25, 2002 I am in agreement with DAW on this one as well, which is why I asked about the engine. Right now, the P79 is doing fine, but the turbo head will likely flow more on the exhaust ports since it had a nice hot turbine housing to reduce its emissions. Work the P90 and stick it on there. The cams are different too. You might be surprised at the change. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 26, 2002 Share Posted June 26, 2002 So, I guess I will be making a change to the better head. I will let you all know what the difference is in share performance. Thanks Quote Link to comment Share on other sites More sharing options...
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