HP400C

309 Machine’s CNC ported HP400 packs a lot of punch in a little package. This is the ultimate mix of big saw power in a little saw package.

HP stands for High Performance, and that's what we are all about. We strive to maximize power while focusing on durability and reliability.

This is for a Powerhead Only, No Bar and Chain are included.

Performance Work includes:

• CNC Cylinder porting
  • Exhaust Port enlargement, timing and polishing
  • Intake Port timing
  • Squish band cut for smaller combustion area
  • Base cut for increased compression
• 309 Machine Decompression Plug
• Undaunted Manufacturing Billet Exhaust