These are the 041 performance dual port cylinder heads.

Features:
- 40x35.5mm Valves
- Single High Rev Springs
- 3/4" Reach Sparkplug

These heads will allow you engine to breathe better and take advantage of larger/dual carbs or a mild cam.
Available for 85.5mm (stock) or 90.5/92mm bore. Select the required bore size below. Sold each.