Aluminum Alloy 5-port Unleaded Cylinder Head, Road & Rally

11-Stud, large valve alloy race ported and flowed head with race quality valves with special beryllium valve seats and special colisbro guides similar to those used on 8 port. Chambers are 21.3~21.5cc's.

Casting shape and profile is based on the 12G1805 "S" 940 casting design.

Machined for C-AEA526 height springs with our locating shims underneath.

With  1.457" and 1.22" exhaust valves and titanium top caps plus 88G459EVO collets for ultimate strength.

Advantages are weight and better cooling on a brand new head as old castings are becoming poor for reliabillty when modifying.

Where the inlet ports are opened up tubes are put in to give full flow benefit.