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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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