MERLIN III

BIG BLOCK CHEVROLET

ALUMINUM CYLINDER HEADS

This is the cylinder head that highly respected drag racers have employed to win NHRA and IHRA National event titles. They are a true high performance head, capable of supporting in excess of 800 horsepower right out of the box. They boast impressive flow numbers for an “out of the box” head with as cast ports.

Take your pick between 310cc and 350cc intake runners. The 119cc combustion chambers and ports are replicas of proven CNC-ported designs to provide optimum combustion efficiency. The assemblies come set up for either hydraulic lifter, solid or hydraulic roller lifters, or mechanical roller lifters (they vary in valve spring and valve specs). Merlin III heads are also available bare.
Key Features | Tech Specs | Instruction Sheet
Merlin III Aluminum BBC Cylinder Heads
Part # Application Description Intake Runner Valve Spring Specs Max Lift Chamber
020650 Bare Head BareHead Rect310cc None None N/A 119cc
020650-2 Hydraulic Merlin III Rect310cc Manley Race Master 1.550" Dual 150# Seat .650" 119cc
020650-3 Solid/Hyd. Roller Merlin III Rect310cc Manley Severe Duty 1.550" Dual 225# Seat .700" 119cc
020650-4 Racing Roller Merlin III Rect310cc Manley Severe Duty 1.640" Dual 250# Seat .800" 119cc
020660 Bare Head BareHead Rect350cc None None N/A 119cc
020660-2 Hydraulic Merlin III Rect350cc Manley Race Master 1.550" Dual 150# Seat .650" 119cc
020660-3 Solid/Hyd. Roller Merlin III Rect350cc Manley Severe Duty 1.550" Dual 225# Seat .700" 119cc
020660-4 Racing Roller Merlin III Rect350cc Manley Severe Duty 1.640" Dual 250# Seat .800" 119cc