Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot) Valve Angle: 23° valve angle provides bolt on compatibility for stock accessories: Bore Spacing: Standard: Intake Port Volume & Shape: Rectangle Shaped, PRECISION As-Cast 185cc, 195cc & 210cc: Combustion Chamber: Heart-Shaped, As-Cast - 64cc, 70cc, 72cc : Application:
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