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  1. FischerMotorsports

    Intake to Exhaust Valve Size Ratios

    I’m currently cad designing, cnc machined, billet 4v heads for several ENDURANCE engines. I’m building them for both na and turbo applications utilizing a maximum rpm of 9,000 to 10,000 rpm. These are water cooled engines, utilizing thermal coatings (pistons, chambers, and ports) built for...
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