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Product Summary

External Ignition Box Required, HEI / Male Cap Type

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    Key Specs

    MFG. Part #8517
    BrandMSD
    Cap TypeHEI / Male
    Advance TypeMechanical
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    Need To Know

    Quick and Easy Returns

    Return Policy

    MSD 8517 Details

    This distributor uses a high-output magnetic trigger to fire an MSD Ignition Control. Accurate trigger signals and spark delivery are the responsibility of the QPQ-coated steel shaft. A sealed ball bearing and long sintered bushing hold this shaft stable at any rpm. An adjustable mechanical advance mechanism is mounted on top of the
    • CNC machined billet aluminum housing and billet aluminum base
    • Easy-to-adjust mechanical advance with supplied springs and stop bushings
    • Maintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm range
    • Polished steel shaft is QPQ coated and guided by a sealed ball bearing
    • Advance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reduction
    • Mechanical advance assembly can be locked out for crank trigger systems
    • Advance weight pins are staked and tig welded to the plate
    • Nylon pads ensure smooth operation of the advance weights
    • Supplied with an HEI style distributor cap and rotor (accepts Cap-A-Dapts)
    • Must be used with an MSD Ignition Control
    • No CARB Exemption Order Number

    Charts

    Rebates

    Holley Fuel Up Spring Savings Event 2026

    Save 10% instantly on select products across the Holley family of performance brands during the annual Holley Fuel Up Spring Savings Event 2026. Instant rebate period runs from March 30, 2026 through April 19, 2026.

    CARB Warning

    For race/ off road use or for use on pre-1966 vehicles.

    Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

    MSD 8517 Specifications

    KEY SPECS
    MFG. Part #8517
    BrandMSD
    Cap TypeHEI / Male
    Advance TypeMechanical
    GENERAL
    External Ignition Box RequiredYes
    Cap Terminal StyleHEI / Male
    Trigger StyleMagnetic
    Hall EffectNo
    Sync SignalNo
    Trigger SensorsSingle
    Gear MaterialIron
    Gear RotationStandard
    Ignition Box RequiredYes
    Mechanical Tach DriveNo
    Slip CollarNo
    Housing MaterialBillet Aluminum
    Housing FinishNatural
    Marine UseNo
    Sold in QuantityEach
    GTIN Code085132085170

    Fitment

    • Buick 455

    • Buick 455

    • Buick 430

    • Buick 455

    • Buick 455

    • Buick 400

    • Buick 400

    • Buick 455

    • Buick 430

    • Buick 455

    • Buick 400

    • Buick 455

    • Buick 455

    • Buick 455

    • Buick 430

    • Buick 455

    • Buick 400

    • Buick 455

    • Buick 400

    • Buick 455

    • Buick 400

    • Buick 455

    • Buick 430

    • Buick 455

    Customer Impersonation Script