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JEGS Performance Products 51511

SB-Chevy High-Flow 197 Heads 2.055" Int/1.60" Exh Valves

JEGS Performance Products 51511

555-51511

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$560.99
$479.99
ON SALE - $81.00 OFF
JEGS Performance Products 51511 SB-Chevy High-Flow 197 Heads 2.055" Int/1.60" Exh Valves $479.99
SB-Chevy High-Flow 197 Heads
  • 2.055" Int/1.60" Exh Valves
  • 1.440" Springs, .680" Max Lift Soild/Flat Tappet, Hydraulic Roller Cams
  • Angle Plug
  • Sold as Each
  • 1 Available at This Price, Please Call Before Ordering

  • JEGS Performance Products 51511 Details

    High-Flow 197 Aluminum Cylinder Heads - 197cc Intake Runners, 72cc Combustion Chambers

    JEGS Cylinder Head Specifications
    Part # 555-51511 23 degree valve angle, angle plug design, SB-Chevrolet

    Materials
  • Casting: A356-A Virgin Grade, Heat Treated to T-6
  • Valve Guides: Manganese Bronze
  • Valve Seats: Alloy, For use with Unleaded Gasoline
  • Combustion Chamber: 72cc

    Intake
  • Port Volume: 197cc
  • Valve Diameter: 2.055'' Stainless Steel # 555-20561
  • Valve Length: 4.910''
  • Valve Stem Diameter: 11/32''
  • Valve Stem Seal Diameter: .531'' PTFE
  • Port Dimension: 1.300'' x 2.050''
  • Flow: 259 cfm @ .700'' lift 28'' of water
  • Gasket: JEGS # 555-210001

    Exhaust
  • Valve Diameter: 1.600'' Stainless Steel, # 555-20566
  • Valve Length: 4.910''
  • Valve Stem Diameter: 11/32''
  • Valve Stem Seal Diameter: .531'', PTFE
  • Port Dimension: 1.490'' x 1.340''
  • Flow: 203cfm @ .700'' lift 28'' of water
  • Gasket: JEGS # 555-210050

    Valve Train
  • Stud Size: 7/16", 7/16" 14 x .875"(bottom) 3/8" 24 x 1.950" (top), # 555-20525
  • Guide Plates: JEG¬íS # 555-20521 (5/16" pushrods)
  • Retainers: Chrome Moly Steel 10 degree, # 555-20530
  • Valve Locks: 10 degree
  • Pushrods: 5/16" Heat Treated, Must Check Length
  • Springs: 1.440" .680" Maximum Lift, Solid/Flat Tappet & Hydraulic Roller, # 555-20540
  • Spring Cups: .570'' Inside Diameter Locater, .060'' thick # 555-20555

    Accessories
  • Head Bolts: Stock Dimensions Recommend 12-Point Head
  • Head Studs: Stock Dimensions Recommend 12-Point Head
  • Spark Plug: 14mm 3/4'' reach 5/8'' Hex with Washer Seat
  • Stud Girdle: Stud Location Custom JEG'S # 555-20500
  • Head Fastener Washers: Use Quality Hardened Washers
  • Accessory Bolt Locations: Stock Placement

    Torque Specifications
  • Rocker Studs: 45 ft/lbs.
  • Manifold Bolts: 35 ft/lbs.
  • Head Fasteners: See Manufacturers Specifications

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