S/R TORQUER

SMALL BLOCK CHEVROLET

CAST IRON CYLINDER HEADS

An improved replacement for the factory Chevrolet 327-350-400 cylinder heads, World's exclusive S/R Torquer series features 170cc intake runners and can provide up to a 30 horsepower increase over most OEM castings. Note, however, that these heads are accepted by many racing associations as stock,” and are 50-state emissions legal. S/R Torquer heads accept early and late model accessories. The exhaust valve seats are hardened to provide compatibility with unleaded gas. The S/R Torquer heads are available in 67cc and 76cc versions for engines up to 1986 and 76cc for 1987-on applications. They are designed to use 2.020" intake and 1.600" exhaust valves, and work well in engines from 302 to 400 c.i.d.

Key Features | Tech Specs | Instruction Sheet
Cast Iron SBC Cylinder Heads
Part # Application Description

Valve Dimensions

 Spring Specs

Max Lift

Chamber
042660 Bare Head Straight Plug 2.02x1.600" 11/32 None N/A 67cc
042660-1 Hydraulic Straight Plug 2.02x1.600" 11/32 1.250" Single 100# Seat .560" 67cc
042660-2 Solid/Hyd Roller Straight Plug 2.02x1.600" 11/32 1.437" Single 125# Seat .600" 67cc
042670 Bare Head Straight Plug 2.02x1.600" 11/32 None N/A 76cc
042670-1 Hydraulic Straight Plug 2.02x1.600" 11/32 1.250" Single 100# Seat .560" 76cc
042670-2 Solid/Hyd Roller Straight Plug 2.02x1.600" 11/32 1.437" Single 125# Seat .600" 76cc
Cast Iron SBC Cylinder Heads (1987 & Up Intake)
042770 Bare Head Straight Plug 2.02x1.600" 11/32 None N/A 76cc
042770-1 Hydraulic Straight Plug 2.02x1.600" 11/32 1.250" Single 100# Seat .560" 76cc
042770-2 Solid/Hyd Roller Straight Plug 2.02x1.600" 11/32 1.437" Single 125# Seat .600" 76cc