World Products 011250-2 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 is normally aspirated depending on displacement and CR and porting

TECHNICAL SPECIFICATIONS:

• Material: High-density cast iron
• Valve Seats: Integral intake, hardened steel exhaust
• 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

011250-2 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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