Big Chief II 11° 555cc CNC
Maximum Top Sportsman, Top Dragster, Pro Mod and Pro Street competition. Excellent with alcohol and nitrous, over 7,000 RPM, over 500 cubic inches.
The latest Big Chief evolution with an 11° valve angle, this head features a multitude of revisions: relocated valve centers, relocated port cores, and a redesigned valve train for increased power and reliability.
With our sophisticated CNC machining programs, we can tailor a pair of Big Chief II heads to fit your exact engine combination.
Copper seats are standard and assemblies come with Titanium valves. Option for 2.500″/1.850″ intake/exhaust valves.
Heads are sold individually.
Material: RMR Cast Aluminum Alloy
Valve Angle: 11°
Intake Port Volume: 555cc CNC
Intake Valve: 2.470”/2.500”
Exhaust Valve: 1.800”/1.850”
Chamber Volume: 56-90cc
Intake Port Shape: Oval
Port Location: Spread port
Big Chief II 11° 555cc CNC – Aluminum
18500000 – Bare Head No Porting
18575070 – Bare Head Full Port 512cc 2.470/1.800 4.600
18575179 – Assembly Full Port 512cc 2.470/1.800 1.650T 4.600