Engine - Cylinder Head ID

1975 1980 20R Cylinder Head:

• Round Intake Port / Round Exhaust Port
• 80 / 81cc Chamber
• In. Valve Dia. 43mm / Ex. Valve Dia. 35mm

1981 / 84 22R / RE Cylinder Head:

• Square Intake Port / Round Exhaust Port
• 82 /83 cc Chamber
• In. Valve Dia. 44.5mm / Ex. Valve Dia. 36.5mm

1985 / 95 22R / RE Cylinder Head:

• Square Intake Port / Pear Shaped Exhaust Port
• 58 cc Chamber or 22RET (Turbo)
• In. Valve Dia. 44.5mm / Ex Valve Dia. 36.5mm

Cylinder Head Intake Air Flow (Aprox):

• Stock: 130 CFM
• Stage 2: 160 CFM
• Stage 3: 200 CFM
• Stage 5: 250 CFM