World Products 030630 – Cylinder Head Cast Iron Chevy Big Block MERLIN 345cc Rectangle Port 350cc 119cc 26Degree 2.300″ x 1.880″, Bare Castings

World Products 030630 – Cylinder Head Cast Iron Chevy Big Block MERLIN 345cc Rectangle Port 350cc 119cc 26Degree 2.300″ x 1.880″, Bare Castings

World’s MERLIN series has earned a reputation as the performance industry standard for Big Block Chevy power. The cast iron MERLINS are available   in both oval and rectangular port designs, with intake ports offered in 310 & 345cc configurations. Choose the port size that will provide the optimum balance of flow and velocity for your engine combination. They are available bare or in complete assemblies that feature multi-angle valve jobs, ERSON stainless steel valves and valve springs matched to camshaft requirements. World Products Merlin cylinder Head for big Chevys combine large intake runners with open combustion chambers to produce good torque and low-end power. Assemblies include valves, springs, retainers, keepers and seals.

TECHNICAL SPECS

• Casting ID Number: I-043B 345cc, I-043C 310cc, I-043D 269cc
• Material: High density cast iron
• Valve Seats: Intake (integral), exhaust (hardened)
• Valve Guides: Integral cast iron
• Spring Seats: Machined for 1.560″ can be machined to 1.650”
• Valves: ERSON stainless steel valves in assemblies
• Valve Diameter: 2.300″ intake, 1.880″ exhaust   (11/32″ stem)
• Rocker Arms: 1.7 ratio
• Intake Runner: 269, 310 or 345cc, standard port location
• Exhaust Ports: 137cc, +.600”
• Combustion Chamber: 119cc
• Spark Plug: 14mm 5/8″.460″ reach tapered style. EX. ACCEL 276 or 276S
• Valve Job: Multi-angle intake and radius exhaust
• Valve Cover Rail: Raised w/ perimeter
• Valve Angle: Stock 26°
• Accessory Bolt Holes: Stock
• Guide Plates: Not Included
• Rocker Arm Studs: Not Included

World Products MERLIN 310cc Iron Head Flow Data

Valve Lift–.300 –.400 –.500 –.600 –.700 –.800 

2.300 —–   213 — 275 — 323 — 363 — 383 — 374 
1.880 —–   165 — 204 — 239 — 262 – 276 — 286  

World Products MERLIN 345cc Iron Head Flow Data

Valve Lift–.300 –.400 –.500 –.600 –.700 –.800 

2.300 —–   213 — 275 — 326 — 366 — 389 — 374 
1.880 —–   165 — 204 — 239 — 262 – 276 — 286
Methods used: Superflow 600, Flowed at 28″ with a bowl blend 1″ down, 1″ radiused entry plate on the intake port, No exhaust tube, Using Manley Race Master valves.

Heads are sold individually.