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Made in USA
Original Series Full Roller Rocker Arm Set, 1.6 Ratio for Small Block Ford, 3/8 in. Stud, Set of 16
InfoVehicle Info Needed
HARLAND SHARPPART NUMBER: 851-4003

Original Series Full Roller Rocker Arm Set, 1.6 Ratio for Small Block Ford, 3/8 in. Stud, Set of 16

$37099
1 left in stock
ShippingShips on Oct 26, 2026
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$100
Aluminum Roller Rocker Arms Small Block Ford 289-302-351W [1.6 Ratio, 3/8 in. Stud]

555-20990

Aluminum Roller Rocker Arms Small Block Ford 289-302-351W [1.6 Ratio, 3/8 in. Stud]

$36999

Ford - Small Block
Original Series Full Roller Rocker Arm Set
  • For Small Block Ford 221-302 and 351W Engines
  • 1.6:1 Ratio
  • 3/8 in. Stud Mount
  • Aluminum, Orange Anodized
  • Set of 16

    Harland Sharp Original Series full roller rocker arms combine an aluminum body, roller tip, and needle-bearing fulcrum for reduced friction and stable valvetrain operation. This 1.6:1 ratio set is designed for Small Block Ford applications using 3/8 in. rocker studs.

    Harland Sharp S4003 Features:

    • Full roller rocker arm construction
    • 1.6:1 rocker arm ratio
    • 3/8 in. stud mount
    • Aluminum body with orange anodized finish
    • Set of 16
    • Made in the USA

    Notes:

    • Fits Small Block Ford 221-302 and 351W engine families
    • Pre-1966 heads require straight rocker studs and guideplates
    • Later production heads generally require machining for guideplates and screw-in rocker studs
    • Verify pushrod length and valvetrain geometry during installation

      • Average Performance Gains of 15 to 40 HP!

      Harland Sharp developed and manufactured the first aluminum needle bearing Roller Tip Rocker Arms in 1960. Since then, thousands of racing enthusiasts have experienced the quality and precision of every Harland Sharp rocker arm. Features include, full needle bearing roller fulcrum, roller tip, and consistent ratios to reduce friction, wear, and to stabilize valve timing. The unique Friction Free Design gives you average gains of 15 to 40 HP. Made In The USA!

      Show More

    Part TypeRocker Arm
    Product LineHarland Sharp Aluminum Roller Rockers
    BrandHARLAND SHARP
    Package Height2.3
    Package Width7.3
    Package Length15.4
    Weight6.28 PG
    Part CategoryPerformance Parts
    Mounting StyleStud Mount
    Rocker Stud Diameter0.375 in.
    Rocker Arm Ratio1.6
    Quantity16
    Engine MakeFord
    MaterialAluminum
    Rocker Arm StyleFull Roller
    Engine FamilySmall Block Ford
    Rocker Arm SeriesOriginal
    Part FitmentSemi Universal
    Engine Displacement221-302, 351W
    FinishOrange Anodized
    Vendor Part NumberS4003
    Package Qty1
    Package TypeEA
    No Questions
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