World Products 011250-2 Small Block Chevy Sportsman II Cast Iron Cylinder Head, 200cc Intake Ports
955-011250-2
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Small Block Chevy Sportsman II Cast Iron Cylinder Heads - 64cc Combustion Chambers, Straight Plug
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
Specifications:
Motor Vehicles
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