Physical Specifications GM 12480011(SB2.2) Castings Intake runner volume     287cc Combustion chamber volume     54cc Intake valve angle 11 deg. x 4 deg. Intake Valve     2.190 dia. x 5.640 length*     Serdi #     B1N1-B1 Exhaust valve angle 8 deg. Exhaust Valve     1.625 dia. x 5.640 length*     Serdi #'s     1st cut: B1X1-A1 2nd cut: H1X2 Intake port opening at gasket     2.15H x 1.55W Distance from floor to deck at gasket     1.9 Intake min. cross sectional dim.     3.065 sq. in. Notations *With T&D rockers, required valve length is: intake 5.610 / exhaust 5.560 Pushrods are clearanced for the most commonly used rocker systems. GM Part # 12480021 Click for larger version of graph

 

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