World Products Small Block Chevy Sportsman-II 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: Machined for 1.250'' and 1.550'' springs
• Valve Sizes: 2.020'' x 1.600''
• Accessory Flange: Stock locations, 7-bolt universal pattern
• Included In Assembly: Erson stainless steel valves, ring and band-style seals, valve springs, Erson 7° chrome moly retainers, and keepers.
  
  Recommended Installation Items
• Head Gaskets: Fel-Pro 375-1003 or equivalent
• Pushrods: Requires heat-treated pushrods. Use of 1.6 ratio rocker arms requires elongation of pushrod holes.
• Screw-in Studs: 3/8" or 7/16" with 7/16"-14 base thread
• Pushrod Guidplates: Flat 5/16" Erson 601 or equivalent
• Spark Plugs: Accepts 14mm .460'' reach tapered seat 5/8'' hex(Accel 276 or 276s, NGK BPMR6F) or equivalent
• Intake Gasket: Fel-Pro 375-1205 or equivalent
• Exhaust Gasket: Fel-Pro 375-1404 or equivalent
  
  Machine Shop Specifications:
• Maximum Valve Diameter: 2.100'' x 1.600'' or 2.080'' x 1.625''
• Maximum Spring Seat Depth (from inside step): .030''
• Maximum Spring Diameter: 1.550''
• Approximate Milling Guideline (varies with depth): .0065'' per cc
• Maximum Flat Mill Depth (up to intake seats): .040''
• Maximum Angle Mill (approx. 50-52cc volume): .175'' depth
  
  Note: Specs are for reference only. ALWAYS measure before machining.