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.


Now available! CNC porting designed by Ernie Elliot!

Full CNC porting of runners and chambers produced between 40 and 50 HP+ than our as-cast versions on our engine combinations (depending on the engine displacement and combination)! A tremendous value for the power produced! More to come!

Key Features | Tech Specs | Instruction Sheet
Aluminum BBC Cylinder Heads
Part # Application Description Intake Runner Valve Spring Specs Max Lift Chamber
020650 Bare Head Bare Head Rect 310cc None None N/A 119cc
020650-2 Hydraulic Assembled Rect 310cc Manley Stainless 1.550" Dual 150# Seat .650" 119cc
020650-3 Solid/Hyd. Roller Assembled Rect 310cc Manley Stainless 1.550" Dual 225# Seat .700" 119cc
020650-4 Racing Roller Assembled Rect 310cc Manley Stainless 1.640" Dual 250# Seat .800" 119cc
020650-CNC Bare Head Bare Head
w/ CNC ports
Rect 345cc None None N/A 139cc
020650-2CNC Hydraulic Assemble
w/ CNC ports
Rect 345cc Manley Stainless 1.550" Dual 150# Seat .650" 139cc
020650-3CNC Solid/Hyd. Roller Assembled
w/ CNC ports
Rect 345cc Manley Stainless 1.550" Dual 225# Seat .700" 139cc
020650-4CNC Racing Roller

Assembled

w/ CNC ports

Rect 345cc Manley Stainless 1.640" Dual 250# Seat .800" 139cc
020660 Bare Head Bare Head Rect 350cc None None N/A 119cc
020660-2 Hydraulic Assembled Rect 350cc Manley Stainless 1.550" Dual 150# Seat .650" 119cc
020660-3 Solid/Hyd. Roller Assembled Rect 350cc Manley Stainless 1.550" Dual 225# Seat .700" 119cc
020660-4 Racing Roller Assembled Rect 350cc Manley Stainless 1.640" Dual 250# Seat .800" 119cc