World Products Big Block Chevy Merlin III Cast Iron Cylinder Heads

Technical Specifications

• Material: High density cast iron
• Valve Seats: Integral intake,hardened steel exhaust
• Valve Guides: Integral cast iron
• Valve Spring Seats: Bare castings machined for 1.550'' springs
• Valve Size: 2.300'' x 1.880''
• Exhaust Flange: Port location raised .250'' , accessory bolt holes, requires ARP Head Bolts #070-135-3605.
• Included In Base Assembly: Erson stainless steel valves, ring and band style (-1 and -2 models) or PC style (-3 and -4 models) valve seals, 1.550'' (-1, -2 and -3 models) or 1.640'' (-4 models) valve springs, Erson 7° (-1 and -2 models) or 10° (-3 models) retainers and keepers.
  
  Recommended Installation Accessories
• Head Gaskets: Fel-Pro 375-1017-1 or equivalent
• Pushrods: Requires heat treated pushrods
• Rocker Arm Studs: 7/16'' with 7/16''-14 base thread
• Pushrod Guideplates: BBC Stepped 3/8''
• Spark Plugs: Accepts 14mm .460'' reach tapered seat 5/8'' hex (AC Delco R42TS/R43TS) or equivalent. Heat range may vary. Consult with engine builder.
• Intake Gasket: Fel-Pro 375-1212 or equivalent for oval port head. Fel-Pro 375-1211 or equivalent for rectangle port head.
• Exhaust Gasket: Fel-Pro 375-1410 or equivalent
• Head Bolts: 8 longer than stock required (955-832015-8)