Big Block GX and Clone JT-97 Large Port Cylinder Head

Large port JT-97 cylinder head for Honda GX390, 420, and 460 clones. Comes bare with seats and guides ready for porting and assembly. Seats fit 36mm intake and 32mm exhaust valves. Guides are standard 6.5mm stem diameter.

Combustion Chamber Volume: 42cc

Flows 115cfm stock - supports 28.75hp stock

36mm intake valve

32mm exhaust valve

6.5mm guides

This casting can be ported to flow more than 200cfm with a 46mm intake valve.