Small Block Chevy Sportsman II Cast Iron Cylinder Head
• 200cc Intake Ports
• 64cc Combustion Chambers
• 2.020'' Int/1.600'' Exh Valves
• 1.250'' Valve Springs, .560'' Max Lift for Hydraulic Cam
• Straight Plug
• Assembled, Sold Individually
  
  

  World Products 955-011250-1 Features:

  Applications: World has tested Sportsman-II heads in many applications including 375Hp 9:1 street engines; 450HP 9.8:1 street /strip engines; to 940HP blown alcohol drag race engines.
  Typical Application Street: 274 Cam: 230/236° .487'/.490', Dart II Sportsman #955-061010 dual plane intake; 750 cfm carb, 1-3/4' header. 430HP on 9.8:1 355; 480HP on 383 10.5:1 (varies with displacement and compression ratio).
  Typical Application Drag Race: Modified 750 cfm carb, 276/284° roller cam, single plane plenum intake, 1-3/4'-plus header. MUST Upgrade to 1.550' roller valve springs and 10° hardware. Up to 650HP, it was normally aspirated depending on displacement CR and porting.

  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' springs
  Valve Size: 2.020' x 1.600'
  Exhaust 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 #1003 ( 265-350 ) or equivalent
  Puhshrods: Requires heat-treated pushrods. The 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 or equivalent
  Intake Gasket: Fel-Pro #1205 or equivalent
  Exhaust Gasket: Fel-Pro #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 Guidelines(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:

  These specifications are for reference only. ALWAYS measure before machining.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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