VAC's Stage 3 Performance Cylinder Heads: Unmatched Performance

Many of our cylinder heads are capable of 120-155 HP per liter N/A, and of course drastically more when used with forced induction. We have spent many, many years on the dyno, the flow bench, and even more years though world-wide racing experience to achieve such excellent results while being reliable enough to compete in professional motorsports. Our Stage 3 heads are intended to produce maximum peak horsepower while still maintaining excellent power-band and drivability. This is the crucial secret of the fastest race engines in the world, but also means that your classic will drive with refinement and efficiency.
Even though they are an extreme departure from stock, our stage 3 heads are excellent for use on the ultimate street performance vehicle as well.

Our Stage 3 Cylinder Heads feature the following:

• Complete Disassembly & Cleaning
• Comprehensive Leak, Crack & Pressure Test
• Inspect All Components For Irregular Wear
• Our Superior Max Performance Multi-angle Intake, Radius Exhaust Valve Job Using Serdi Equipment
• One-Piece High Performance Stainless Steel Valves, Balanced and Blueprinted (Standard or Oversized)
• Unshrouding of Valves
• Meticulous Port and Polish Work
• Attention to Potential Hot-spot Areas and Chamfering
• CC'ed and Chamber Reprofiling as Needed
• All New VAC Up rated Valve Guides
• Trueness Checked & Resurfaced Mating Surface
• High Performance VAC Valve Springs, Balanced
• Titanium Or Steel Alloy Valve Spring Retainers
• Proprietary Tweaks to Improve Performance

  Everything above is a Flow-Bench and real world tested design

*Core cylinder head is required for this job. We prefer to work with the customers core cylinder head, but one can be supplied on request by clicking above.*

VAC Tech Tip:
A high performance engine works most efficiently with the broadest powerband when everything is designed to work together.
Stage 3 heads are VAC's pinnacle of R&D and this philosophy.