PPE Performance Duramax LMM STAGE 1 Cylinder Head. These heads have a 5 angle valve job, are 5 axis CNC ported including radiusing the intake ports, and include titanium retainers, new spring cup bases, beehive valve springs with higher spring pressure, and new valve stem seals. These flow 35 CFM more than stock heads on the intake and exhaust ports.

Sold Individually- 2 Required