SB-Ford High-Flow 170cc Aluminum Head 2.02" Int/1.60" Exh Valves

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2.02'' Int/1.60'' Exh Valves
1.440'' Springs
.580'' Max Lift, Hydraulic Roller
Sold as Each
Flow Chart

JEGS Cylinder Head Specifications
Part # 51490 18-degree valve angle, angled-plug design, SB-Ford
Materials
Casting: A356-A Virgin Grade, Heat Treated to T-6, CNC Gasket-Matched Intake & Exhaust Ports
Valve Guides: Manganese Bronze
Valve Seats: Alloy, For use with Unleaded Gasoline
Combustion Chamber: 58cc CNC-Bowl Blend
Intake
Port Volume: 170cc
Valve Diameter: 2.02' Stainless Steel # 555-20560
Valve Length: 4.910'
Valve Stem Diameter: 11/32'
Valve Stem Seal Diameter: .531' PTFE
Port Dimension: 1.148' x 1.920'
Flow Rate: 254.9 cfm @ .700' lift 28' of water
Gasket: JEGS # 555-210200
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: 1.289' x 1.381'
Flow Rate: 198.2cfm @ .700' lift 28' of water
Gasket: JEGS # 555-210250
Valve Train
Stud Size: 7/16'-14 x .750'(bottom) 7/16'-20 x 1.900' (top), ARP# 070-100-7101
Guide Plates: Custom JEG?S # 555-20523 (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' .580' Maximum Hydraulic Roller JEG?S # 555-20540
Spring Cups: .570' Inside Diameter Locater, .060' Thick, # 555-20555
Accessories
Head Bolts 302: ARP # 070-154-3601
Head Bolts 351: Does NOT fit 351W with 1/2' head bolts
Spark Plug: 14mm 3/4' reach 5/8' Hex with Washer Seat
Stud Girdle: Stud Location Custom, Not Available
Recommended Cam: 249-35-518-8 for best performance
Rocker Arms 7/16': Small Block Ford, # 555-20133 or Equivalent
Head Gasket: JEGS # 555-210240 or equivalent
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