Made in USA
Pro-Billet Ready-to-Run Distributor Buick Nailhead
InfoVehicle Info Needed
MSD IGNITIONPART NUMBER: 121-8524

Pro-Billet Ready-to-Run Distributor Buick Nailhead

$70095$779.95You Save$79.00
ShippingShips on Sep 03, 2026
Lowest PriceLowest Price Guarantee

Buick
    Pro-Billet Ready-to-Run Distributor
  • Buick Nailhead
  • CARB E.O. #D-40-39
  • Red

    Features:
  • Powerful built-in module produces a 7.5 amp single spark through high rpm
  • Easy-to-adjust mechanical advance with supplied springs and stop bushings
  • Vacuum advance canister for improved economy (can be locked out)
  • Mechanical advance assembly can be locked out for crank trigger systems
  • Supplied with an HEI style distributor cap and rotor (accepts Cap-A-Dapts)
  • Does not require an MSD Ignition Control
  • Includes Built-in Rev Limiter
  • 50-State legal
  • CARB O.E. D-40-39
  • Simple and clean installation with only three wires to connect
  • Includes built-in Rev Limiter!
  • Does not require an MSD Ignition Control
  • Supplied with an HEI style distributor cap and rotor (accepts Cap-A-Dapts)
  • Mechanical advance assembly can be locked out for crank trigger systems
  • Advance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reduction
  • Polished steel shaft is QPQ coated and guided by a sealed ball bearing

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

    MSD has the Best Distributor for Your Vehicle

    MSD Billet and Pro-Billet Distributors with CNC-machined billet aluminum housings have maintenance-free magnetic pickups guided by a sealed ball bearing located at the top of the housing.

    Show More

    For drivers who demand performance, precision, and reliability, the MSD Billet & Pro-Billet Distributors are the gold standard in ignition control. Whether you’re building a high-performance street machine or a dedicated race car, MSD delivers the spark accuracy and rugged construction you need to push your engine to the limit.

    Each MSD Pro Billet Distributor is CNC-machined from high-quality billet aluminum for maximum strength and minimal flex, even at high RPMs. The polished housing isn’t just for looks—it’s built to last, resist corrosion, and endure extreme engine conditions. Inside, a maintenance-free magnetic pickup provides accurate trigger signals, while a hardened steel shaft with a sealed ball bearing ensures long-lasting performance.

    The Pro Billet Distributor MSD lineup is compatible with MSD ignition controls and features an easy-to-adjust mechanical advance, making tuning a breeze. Whether you're dialing in timing for the street or strip, you’ll get consistent spark delivery and smoother acceleration across the power band.

    If you're upgrading a small block Chevy, the MSD Pro Billet Distributor SBC is a perfect match, offering drop-in compatibility and serious performance gains. These distributors are designed to meet the needs of racers and enthusiasts who won’t settle for stock performance.

    Step up your ignition system with the proven power and reliability of MSD Billet and Pro-Billet Distributors—engineered to ignite your build's full potential.

    Whether you’re working on a high performance race car or a daily driver street machine, precise and durable ignition components are always going to be a real must. An MSD billet or Pro-Billet distributor is a distinct upgrade from your OEM distributor setup, with accurate spark delivery and durable, rugged construction that will let you really push the envelope of your engine’s performance. 

    Performance Benefits & Key Features

    Every MSD Billet distributor is machined from top grade billet aluminum and a hardened steel shaft, with maintenance-free magnetic pickups for accurate and consistent ignition signal, and a precision ball bearing set with long sintered bushing guide at the top of the housing. The polished housing looks great, but it’s more than just a dress-up feature; it’s designed to resist corrosion and to hold up under some of the most extreme engine conditions. 

    The Pro-Billet and MSD Billet lineup at JEGS is designed for compatibility with other MSD ignition components, with a mechanical advance that’s easy to adjust to dial in the timing you need on the strip or street. It’s easy to adjust it to your setting and you’ll get reliable spark delivery and stronger, smoother acceleration across the power band. For older applications, select MSD Billet distributors are equipped with vacuum advance. 

    Fitment, Compatibility & Applications 

    For small block Chevrolet applications, MSD’s Billet and Pro-Billet distributors are designed for drop-in installation. Distributor setups are available for small block and big block Chevrolet V8s, AMC V8s, Buick (including Nailhead V8s), Cadillac, small block and big block Ford engines, Ford flathead V8s, and big block and small block Chrysler (including first-gen Hemi V8s). Along with distributors, this is your one-stop-shopping destination for full ignition upgrade packages from MSD, including the distributor, cap, coil, coil wire, plug wires, as well as a digital 6AL ignition control box for later model Chevrolet small block applications. 

    Plug wires are standard 8.5mm size and can be cut to fit your desired length, and of course MSD’s iconic red hardware and plug wires look great under the hood of any car. Regardless of what kind of vehicle you’re driving and what kind of V8 it’s equipped with, an MSD Billet distributor or a full ignition upgrade of MSD components is a great way to squeeze a little more performance, response and dependability out of your setup.

Part TypeDistributor
Product LineMSD Billet & Pro-Billet Distributors
BrandMSD IGNITION
Package Height6.9
Package Width7.2
Package Length17.9
Weight5.84 PG
Part CategoryPerformance Parts
Marine UseNo
Housing FinishNatural
Housing Materialbillet aluminum
Ignition Box RequiredNo
QuantitySold individually
Distributor TypeHEI/Breakerless
Engine Make/SizeBuick Nailhead 322-425
Computer-Controlled CompatibleNo
Trigger StyleMagnetic
Distributor Gear RotationStandard
Cap StyleMale/HEI
Part FitmentSemi Universal
Slip CollarNo
Mechanical Tach DriveNo
Gear MaterialIron
Advance TypeVacuum and mechanical
Vendor Part Number8524
Package Qty1
Package TypeEA
No Questions
No Reviews

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