2021-2026 HONDA CRF450R DEF RACING DRAG & FLAT TRACK CYLINDER HEAD KIT

Description

This cylinder head setup was developed specifically for maximum horsepower in a drag racing, flat track and even Outlaw kart applications. Delivering significant gains in mid to top end power. We have seen this head make over 100HP on methanol fuel builds. A simple all in one package with performance and quality you can trust!

Core exchanges are available. You can save $500 and send in your good core.

Specifications:

• CNC Ported: Designed to generate maximum HP/TRQ in the upper mid to high rpm region. Throat ID’s, seat angles and ports are optimized for the oversize valves. The larger exhaust valves significantly improve the scavenging effect improving engine efficiency and the larger intake valves increase the engines’ ability to pull enough air for the larger bore and stroker engines.
• Intake Spigot: Welded-on intake spigot allows for running larger throttle bodies to reach maximum performance. Recommended throttle body size: RP Race 52MM or 54MM
• Valve Seats and Valve Guides
  • CNC machined valve seat profiles
  • Intake valve seats are upgraded to Moldstar
  • Intake valve guides are upgraded to Moldstar
  • Increased durability and performance with these upgrades!
• Oversize Valves
  • +2MM Steel Exhaust Valves
  • +2MM Titanium Intake Valves
• Racing Springs: Assembled with a proven KPMI Spring Kit and OEM valve guide seals

For Optimal Performance:

• Head spec was designed to perform best with our DEF-Racing Drag Spec Camshaft

 If we are out of inventory, we can use your head core and perform the same modifications, turnaround time is 3-4 weeks. Customer supplied core saves $500 from the list price shown.

Head kit still requires the use of your own OEM rocker arms, finger followers and shafts.