The Easiest Way to Bolt On 30-70HP!
Continuosly improved since it's 1987 introduction, the Sportsman II is still the industry's most popular cast iron high performance head. Featuring RightCast 200cc intake runners, Fast-Burn chambers and your choice of angled or straight plugs, they're good for 30-70 HP increases right out of the box. They are the aftermarket's only 50-state emissions legal cast iron high performance cylinder head (EO #D-343-1). You should also know that all World Products heads are percision CNC-machined, and indexed off the chambers to assure perfect alignment with the cylinders. Only World offers complete assemblies with genuine Manley stainless steel Street-Flo or RaceMaster valves and other quality components including springs, retainers, keepers, screw-in studs and guide plates.
Technical SpecificationsMaterial: 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''
Rocker Arm Studs: 3/8'' screw-in style with hex-shoulder
Accessory Flange: Stock locations, 7-bolt universal pattern
Included In Assembly: Manley Street-Flo (-1 models) or Manley RaceMaster (-2 models) forged stainless steel valves with swirl-polished heads, ring and band-style seals, valve springs, Manley 7° chrome moly retainers, keepers and guide plates.
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.
Spark Plugs: Accepts 14mm .460'' reach tapered seat 5/8'' hex (Accel 274 or 276, AC-Delco 43TS or 44TS or equivalent)
Intake Gasket: Fel-Pro 375-1205 or equivalent
Exhaust Gasket: Fel-Pro 375-1404 or equivalentMachine 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.
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