Perfect for Big-Inch Motors!Designed to provide an even greater intake charge than the Sportsman II, World's Motown 220 clearly rates as the ultimate small block cast iron head. It features the latest high tech 64cc chambers and RightCast 220cc runners to provide a combination of excellent flow and high velocity. With high-flow ports and standard intake valves, Motown 220 heads are the ideal compliment to large displacement small blocks (383ci and larger).
Technical SpecificationsMaterial: High density cast iron
Valve Seats: Integral intake, hardened steel exhaust
Valve Guides: Integral cast iron
Valve Spring Seats: Machined for 1.550'' springs
Valve Size: 2.080'' x 1.600''
Rocker Arm Studs: 3/8'' (-2 models) or 7/16'' (-3 models) screw-in style hex shoulder
Accessory Flange: Stock locations, 7-bolt universal pattern
Included In Assembly: Manley RaceMaster (-2 models) or Severe Duty (-3 models) 1-piece forged stainless steel valves with swirl-polished heads, ring and band (-2 models) or PC (-3 models) style seals, 1.440'' (-2 models) or 1.550'' (-3 models) valve springs, Manley 7° (-2 models) or 10° (-3 models) chrome moly retainers, keepers and pushrod 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 (AC Delco R43TS or R44TS or equivalent)
Intake Gasket: Fel-Pro 375-1205 or equivalent
Exhaust Gasket: Fel-Pro 375-1404 or equivalentMachine Shop Specifications
Maximum Valve Diameter: 2.125'' 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 seat): .040''
Maximum Angle Mill (approx. 50-52cc volume): .175'' depth
Note: Specs are for reference only. ALWAYS measure before machining.
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