66511K Harmonic Balancer Kit for Early Small Block Chevy [8 in., Internal Balance]
InfoVehicle Info Needed
PROFORMPART NUMBER: 778-66511K

66511K Harmonic Balancer Kit for Early Small Block Chevy [8 in., Internal Balance]

$14196
ShippingShips on Nov 10, 2026
Lowest PriceLowest Price Guarantee

Items You Need

Universal Harmonic Balancer Puller/Installer Set

JEGS

Universal Harmonic Balancer Puller/Installer Set

Part Number : 555-81395
$7399$81.99
You Save$8.00
Heavy-Duty Nitrile Gloves [7 mils Thick, X-Large]

JEGS

Heavy-Duty Nitrile Gloves [7 mils Thick, X-Large]

Part Number : 555-1125
$1999$21.99
You Save$2.00
Fender Cover with Pocket [23 in. W x 31 1/2 in. L]

JEGS

Fender Cover with Pocket [23 in. W x 31 1/2 in. L]

Part Number : 555-65010
$1399$16.99
You Save$3.00
Industrial Strength Cleaner and Degreaser [1 Gallon]

JEGS

Industrial Strength Cleaner and Degreaser [1 Gallon]

Part Number : 555-72302
$1499$16.99
You Save$2.00

Harmonic Dampers
Harmonic Balancer Kit
  • Early Small Block Chevy
  • 8 in.
  • Internal Balance
  • Includes:
    • Harmonic Balancer
    • Balancer Bolt
    • Adjustable Timing Pointer
    • Timing Tape

      Proform 66511K Harmonic Balancer Kit Includes:

      • (1) Proform Harmonic Balancer for Early Small Block Chevy 66511
      • (1) JEGS Balancer Bolt for Small Block Chevy 555-82800
      • (1) JEGS Adjustable Timing Pointer Small Block Chevy For 8 in. Balancer 555-51287
      • (1) JEGS Timing Tape Small Block Chevy FOr 8 in. Balancer 555-40703
    • Precision Balancing for Maximum Performance

      Proform Harmonic Dampers are engineered to reduce harmful engine vibrations, ensuring smoother operation and extending the life of critical engine components. Manufactured with high-quality materials and precise balancing, these dampers deliver dependable performance for both street and racing applications. Designed as direct-fit replacements, Proform Harmonic Dampers provide durability, accuracy, and the performance confidence enthusiasts expect.

    Part TypeHarmonic Balancer
    Product LineProform Harmonic Dampers
    BrandPROFORM
    Part CategoryPerformance Parts
    Degree MarkingsYes
    Harmonic Balancer ConstructionElastomer
    QuantitySold individually
    Mounting Hardware IncludedNo
    Harmonic Balancer MaterialNodular iron
    Part FitmentSemi Universal
    Outside Diameter8 in (203.2 mm)
    Safety RatingNot SFI Approved
    Engine BalanceInternal
    Harmonic Balancer FinishNatural
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning