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Hi, what shape are the exaust ports on p90 head??? I have square port headers which fit e88. Are they identical?? A guy at MSA told me P90 had diamond shape ports, so I need to get different headers for it. They look to be the same to me, but haven't measured it, so might be wrong. Any info will be appreciated. Also, what's the maximum compression ratio that l6 can take with 91 octane gas?? Thanks!!

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The ports on a P90 HEAD are square. The stock turbo exhaust MANIFOLD that would have bolted up to to that head has diamond shaped ports. Your headers should fit fine. Don't know about the compression ratio.

Nigel
'73 240Z Turbo
 
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