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POWERHEADS Gforce premium aluminum cylinder heads are available in three runner sizes to fit a wide range of engine CID. Competition porting options will further enhance their potential if so desired. From 302 to 427 cubes, POWERHEADS can build the right cylinder head to meet your performance goals . . . Please call us with any questions.

ALL CYLINDER HEADS INCLUDE 5 ANGLE SEATS, ADDITIONAL CLEARANCING OF CHAMBER/SEAT AREAS TO ENHANCE LOW/MID LIFT AIRFLOW, 21N FORGED STAINLESS SWIRL POLISHED VALVES, 570’’ LIFT DUAL SPRINGS, CHROME MOLY RETAINERS, VITON OIL SEALS, 7/16’’x 3/8’’ SCREW-IN STUDS WITH GUIDE PLATES, PROFESSIONAL ASSEMBLY AND VACUUM TESTED TO ENSURE VALVE SEAT INTEGRITY . . .

Intake runner volume = 165 cc
Combustion chamber = 60 cc
Exhaust runner volume = 68 cc
1.94’’ x 1.60’’ forged valves

Intake runner volume = 185 cc
Combustion chamber = 65 cc
Exhaust runner volume = 68 cc
2.02’’ x 1.60’’ forged valves

Intake runner volume = 205 cc
Combustion chamber = 65 cc
Exhaust runner volume = 70 cc
2.05’’ x 1.60’’ forged valves



CNC porting will add approx 20cc to intake & 15cc to exhaust runner volumes