LT1/LT4 Cylinder Head Porting & Upgrade Service

Our CNC-porting of GM LT heads significantly improves airflow of these heads. The stock LT heads are known to have valve guide wear issues. We replace the factory guides with CHE valve guides made from CHE's proprietary bronze alloy. This extends the heads' longevity. We know what makes power and also survives the beating of competition.  It's not chasing peak air flow at max lift by excessively cutting away the metal around the valve guides. Peak air flow occurs at only one instant in the cycle. Our focus is more on average air flow across the entire cycle. For spring packages with 0.650 inch max-lift, quoting a peak airflow at 0.800 inches is irrelevant.  Of paramount importance for us is that our heads don't break and wreck our engines.  We therefore do not chase flow at the expense of weakening the heads mechanical integrity. That's a concern that non-engine builders don't share. We will disassemble and clean your heads upon arrival. Our process for machining these heads starts wi