Cathedral Port R1:

• .612”/.607” Valve Lift w/ 1.7 Rocker
• 225/228 Duration @ .050”
• 113LSA + 4* Advance
• 1800-2200 Stall Recommended
• Mild Chop

Cathedral Port R2:

• .617”/.614” Valve Lift w/ 1.7 Rocker
• 231/236 Duration @ .050”
• 112LSA + 4* Advance
• 2400-2800 Stall Recommended
• Moderate Chop

Cathedral Port R3:

• .621”/.615” Valve Lift w/ 1.7 Rocker
• 235/244 Duration @ .050”
• 114.5LSA + 4.5* Advance
• 3400+ Stall Recommended
• MAX Duration for Stock Pistons w/ Unmilled Heads
• Very Aggressive Chop

Cathedral Port R4 Stroker:

• .624”/.615” Valve Lift w/ 1.7 Rocker
• 249/256 Duration @ .050”
• 112LSA + 4* Advance
• 3400+ Stall Recommended
• Requires Aftermarket Pistons
• Maximum Aggression Chop