Avail Motorsports CNC ported Race Head

avail motorsports cnc ported Race cylinder head Avail CNC Ported Stock Valve Race Head - 
Recommended for stock bore up 157cc big bore kits. Depending on the camshaft, expect to retain good low RPM performance with a strong increase in mid-high rpm power and more available overrev.
- CNC Ported/Polished intake and exhaust port with removed guides for increased flow
- 25mm Intake Port to allow use of 24mm, 26mm, 27mm, 30mm and 34mm Throttle Body Kits
- 23mm Exhaust Port to pair with smaller and larger exhaust systems 
- Upgraded HD Valve Springs safe to 12,000rpm (11,000rpm11,5000rpm recommended for most exhaust, 12k+ only with a larger 30mm-34mm throttle body, high lift cam, and larger exhaust (Yoshimura/Rocket Big Bore/Bills Big Bore)
- Stock valve size to improve low end response and increase long term reliability, OEM replacement valves available at any Honda dealer
This cylinder head comes updated with new features and fully assembled (Excludes rocker arms/tappets) -
NOTE - ECU Flashes are available for specific configurations, see here