Rectangle Port R1:

• .610”/.612” Valve Lift w/ 1.7 Rocker
• 223/234 Duration @ .050”
• 113LSA + 4* Advance
• 1800-2200 Stall Recommended
• Mild Chop

Rectangle Port R2:

• .615”/.615” Valve Lift w/ 1.7 Rocker
• 229/242 Duration @ .050”
• 112LSA + 4* Advance
• 2400-2800 Stall Recommended
• Moderate Chop

Rectangle Port R3:

• .618”/.615” Valve Lift w/ 1.7 Rocker
• 233/250 Duration @ .050”
• 113LSA + 5* Advance
• 3400+ Stall Recommended
• MAX Duration for Stock Pistons w/ Unmilled Heads
• Very Aggressive Chop

Rectangle Port R4 Stroker:

• .624”/.615” Valve Lift w/ 1.7 Rocker
• 245/256 Duration @ .050”
• 113LSA + 5* Advance
• 3400+ Stall Recommended
• Requires Aftermarket Pistons
• Maximum Aggression Chop