MERLIN RECTANGULAR PORT

BIG BLOCK CHEVROLET

CAST IRON CYLINDER HEADS

When larger displacement engines (468 and up) require additional flow, choose Merlin Rectangular Port cylinder heads. With RightCast® 320cc and 345cc intake runners, you can expect solid gains in air/fuel mixture combustion charges. These heads will really respond to higher compression ratios, and are ideally suited for hot street/strip cars. The larger heads with 345cc intake ports are used successfully on Merlin crate motors with up to 632 cubic inches displacement and can support 760 HP in box stock mode!
Key Features | Tech Specs | Instruction Sheet
Cast Iron BBC Cylinder Heads
Part # Application Description Intake Valve Spring Specs Max Lift Chamber
030620 Bare Head Bare Head Rect 320cc None None N/A 119cc
030620-2 Hydraulic Assembly Rect 320cc Manley Stainless 1.550" Dual 150# Seat .650" 119cc
030620-3 Solid/Hyd. Roller Assembly Rect 320cc Manley Stainless 1.550" Dual 225# Seat .700" 119cc
030620-4 Racing Roller Assembly Rect 320cc Manley Stainless 1.640" Dual 250# Seat .800" 119cc
030630 Bare Head Bare Head Rect 345cc None None N/A 119cc
030630-2 Hydraulic Assembly Rect 345cc Manley Stainless 1.550" Dual150# Seat .650" 119cc
030630-3 Solid/Hyd. Roller Assembly Rect 345cc Manley Stainless 1.550" Dual 225# Seat .700" 119cc
030630-4 Racing Roller Assembly Rect 345cc Manley Stainless 1.640" Dual 250# Seat .800" 119cc