Structural features like Air Flow Research's trademark 3/4'' thick head deck, a must for blown and nitrous applications, reinforced rocker stud bosses, and thick wall runners provide unparalleled durability. An exclusive new modern combustion chamber design with double quench pad area helps the LSX generate huge low- and mid-lift airflow numbers. If you need a snake charmer for that pesky neighborhood ''Cobra'' look no further. .

Installation Notes: LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.
Hydraulic roller cams in ''LS'' Gen III engines typcially experience valve float at 6600-6800 RPM's. If you are using aftermarket rocker arms, plan on running over .600'' gross valve lift, or if you are revving beyond 6600 RPM valve float will become prominent. AFR suggests you upgrade your springs to AFR p/n 033-8019. This upgrade spring has higher seat and open pressures (155/410+) to better reduce the risk of valve float in more aggressive applications.

210cc LSX Mongoose Street Cylinder Head Features:

• 100% CNC Ported Combustion Chambers
• 100% CNC Ported Exhaust Ports
• 100% CNC Ported Intake Ports
• Competition 5-angle Valve Job
• 210cc Intake Ports
• 84cc Exhaust Port
• 66cc Combustion Chambers
• Bead Lock Intake Valve, 2.020'' x 4.907'' Overall Valve Length
• Bead Lock Exhaust Valve, 1.600'' x 4.907'' Overall Valve Length
• PAC Racing Valve Spring: 1.290'' OD Hydraulic Roller Dual Valve Spring, 135 lbs on seat, .600'' maximum lift, Max RPM 6300-6500
• 7° 1.250'' Titanium Retainers
• 7° Bead Lock Valve Keepers
• Viton Valve Seals
• Hardened Spring Cup
• Intake Valve Seats
• Exhaust Valve Seats
• Bronze Valve Guides