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Product Discontinued
JEGSPART NUMBER: 555-51490-R
*Remanufacured* SB-Ford High-Flow 170cc Aluminum Head 2.02" Int/1.60" Exh Valves
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This product is no longer available. Please call customer service for assistance at 1-800-345-4545.
- *Remanufacured* SB-Ford High-Flow 170cc Aluminum Head
- 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-FordMaterials
- 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
BrandJEGS
Package Height6.9
Package Width10.3
Package Length24.2
Weight30.85 PG
Part CategoryPerformance Parts
Package Qty1
Package TypeEA
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