Physical Specifications
GM 12480011 (SB2.2) Castings
Intake runner volume     286cc
Combustion chamber volume     51cc
Intake valve angle 11 deg. x 4 deg.
Intake Valve     2.170 dia. x 5.840 length
    Serdi #    HP2849-B1 (50 deg. seat)
Exhaust valve angle 8 deg.
Exhaust Valve     1.625 dia. x 5.640 length
    Serdi #    HP2684-B1 (55 deg. seat)
Intake port opening at gasket     2.16H x 1.52W
Distance from floor to deck at gasket     (Black plug) 1.97
Intake min. cross sectional dim.     2.81 sq. in.
Notations
Pushrods are clearanced for the most commonly used rocker systems.
Cylinder Head Design Description
GP Tech 1.1 is a revision of the GP Tech 1 design.
GP Tech GM SB2.2 - GP Tech 1.1

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WELD TECH 1789 South Green Street Brownsburg, IN 46112 (317) 852-4450 Fax: (317) 852-5291