Small Block Chevy Sportsman II Cast Iron Cylinder Head
• 200cc Intake Ports
• 72cc Combustion Chambers
• Cut for 2.020'' Int/1.600'' Exh Valves
• Angle Plug
• Bare Head, Sold Individually
  
  Applications: World has tested Sportsman-II heads in many applications including 375Hp 9:1 street engines; 450HP 9.8:1 street /strip engines; all the way 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 normally aspirated depending on displacement and 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'
  Rocker Arm Studs: 3/8' shank, screw-in style with hex shoulder furnished with assembly
  Exhaust Flange: Stock locations, 7-bolt universal pattern

  Recommended Installation Items:
  Head Gaskets: Fel-Pro #1003 ( 265-350 ) or equivalent
  Puhshrods: Requires heat-treated pushrods. Use of 1.6 ratio rocker arms require elongation of pushrod holes.
  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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