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High-Flow 197 Aluminum Cylinder Heads - 197cc Intake Runners, 64cc Combustion Chambers
- SB-Chevy High-Flow 197 Aluminum 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
Flow Chart
JEGS Cylinder Head Specifications:Part # 51411 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: 64cc
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?S # 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
BrandJEGS
Package Height7.7
Package Width11.1
Package Length24.9
Weight31.65 PG
Part CategoryPerformance Parts
Package Qty1
Package TypeEA
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