M311 273cc LS3 Cylinder Heads

Fully CNC ported, Stainless Steel Severe Duty Valves, PAC .700” Lift Valve Springs, O-Ringed Exhaust Ports and Titanium Retainers

• Fully 5-Axis CNC ported, 68cc chamber volume
• 273cc intake port, 112cc exhaust port and 11° valve angle
• If needing to extend your alternator harness connection, use ICT# WEALT30-36 (4-pin) or WEALT40-36 (2-pin)
• High Quality Components:
  Black Nitride Stainless Steel Severe Duty Valves
  Custom PAC .700” Lift Valve Springs
  Titanium Retainers
• O-Ringed Exhaust Ports (Hi-Temp Silicone O-rings Included)
• 2″ Headers Recommended
• Compatible with 4-bolt and 6-bolt cylinder heads

*Does not include rockers or rocker stands