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| Re: H89 vs gx head |
Subject: Re: H89 vs gx head
by D on 2019/5/21 1:58:56
the Cleveland 4v heads vs 2v is a good example DD
Seems they had to use smaller valves to get some
decent lower down airflow to suit 1170cc gx models.
Full race applications with 1300cc bigger valves etc.
What still surprises me is that the little roundport
was used in big bore 1600cc 80s Sunnys with lots of
"learnt" architectural changes from years of development
they never resembled anything from the factory.
Maybe it was cheaper to start with a round port a12 head
to get what they wanted than to waste a GX head or
buy a gx head vs a roundie.
http://www.pitroad-ts.com/tuning/Ts-cup/miya-z/a12a-2.JPG
http://www.pitroad-ts.com/tuning/Ts-cup/miya-z/miyaz-6.JPG
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