Buick Nailhead V8 Pro Series Ready to Run Distributor

• Fits Buick Nailhead V8 — 264, 322, 364, 401, and 425 CID carbureted applications

• Counter-clockwise distributor rotation — verify before wiring plug wire orientation

• Tunable advance curve — 3 bushings, 4 springs, vacuum block-off plate included

• External coil required (35,000V+) — tach output cable included, no ignition box needed

The TSP Pro Series Ready-to-Run Distributor for the Buick Nailhead V8 brings precise, adjustable ignition performance to the full Nailhead family — 264 CID (4.3L), 322 CID (5.3L), 364 CID (6.0L), 401 CID (6.6L), and 425 CID (7.0L) — in carbureted applications spanning the entire 1953–1966 Nailhead production era. Built on a machined aluminum housing with a circuit board module and magnetic pickup trigger, this distributor delivers accurate, repeatable ignition timing without points, condenser, or a separate ignition control box.

Counter-clockwise rotation: The Buick Nailhead V8 runs a counter-clockwise distributor rotation — the opposite of most domestic V8 engines. This affects rotor phasing and spark plug wire routing and must be accounted for during installation. Verify your firing order and plug wire layout for counter-clockwise rotation before finalizing installation.

Unlike an HEI design, the Pro Series uses an external ignition coil, giving you flexibility to run a coil matched to your specific build. A minimum coil output of 35,000 volts is required — coil is not included. The magnetic pickup trigger eliminates points and condenser wear entirely. Three advance bushings and four advance springs are included, allowing the mechanical advance curve to be tuned to your Nailhead's camshaft profile, compression ratio, and carburetor calibration. A vacuum advance block-off plate is included for performance and race applications. A tachometer output extension cable is included for straightforward aftermarket tach wiring.

The Buick Nailhead is a legendary powerplant in American hot rod and custom culture — the 401 and 425 especially have long histories in early drag racing, lakester builds, and custom street applications. Whether you're restoring a first-generation Riviera, rebuilding a '65 Wildcat, refreshing a 1950s Roadmaster or Century, or running a Nailhead in a hot rod project, the Pro Series Ready-to-Run provides the advance tunability and precision that a stock points distributor cannot deliver.

The Buick Nailhead V8 — Production Era and Why Ignition Matters
The Buick Nailhead V8 was produced from 1953 through 1966, spanning five distinct displacements from the early 264 CID through the final 425 CID big-block. Named for its distinctive small vertical valves that resemble nailheads, the engine powered the full range of Buick's lineup during its era — from the Century and Special to the Roadmaster, Electra, LeSabre, Wildcat, and the iconic first-generation Riviera. The 401 and 425 became cornerstones of early drag racing and hot rod culture, and the Nailhead remains one of the most sought-after American V8 engines for vintage builds, customs, and restorations.
Factory points distributors on these engines are now sixty-plus years old in many cases. Points wear, timing drifts, and ignition reliability degrades — problems that compound on performance builds running modified camshafts or aftermarket carburetors. The Pro Series Ready-to-Run addresses all of these issues with a magnetic pickup trigger that holds timing accurately without maintenance and an adjustable advance curve that a stock points system cannot provide.

Performance Benefit
The circuit board module and magnetic pickup trigger deliver precise, repeatable spark timing without the wear and drift that accumulates with points contact over time. Three advance bushings and four advance springs allow the mechanical advance curve to be customized for your specific Nailhead combination — particularly valuable on performance builds where factory advance timing is not optimal. A vacuum advance block-off plate is included for race and dedicated performance builds where full timing control is preferred through mechanical advance only. The tachometer output extension cable simplifies wiring an aftermarket electronic tachometer without additional adapters.

What Buick Nailhead engines does this distributor fit?
This distributor fits all five Buick Nailhead V8 displacements — 264 CID (4.3L, 1953–1954), 322 CID (5.3L, 1954–1956), 364 CID (6.0L, 1957–1958), 401 CID (6.6L, 1959–1966), and 425 CID (7.0L, 1963–1966) — in carbureted applications. Supported vehicles include the Buick Special (1954–1960 Nailhead years only), Century (1954–1958), Super (1954–1958), Roadmaster (1953–1958), LeSabre (1959–1966), Invicta (1959–1963), Electra (1959–1966), Wildcat (1963–1966), and first-generation Riviera (1963–1966).

The Buick Nailhead runs counter-clockwise rotation — does this distributor account for that?
Yes. This distributor is designed specifically for the Buick Nailhead V8's counter-clockwise distributor rotation. During installation, verify your rotor direction and spark plug wire routing for counter-clockwise operation. Most domestic V8 engines run clockwise rotation, so do not assume standard clockwise wire routing applies — incorrect plug wire orientation based on a clockwise assumption will cause misfires across multiple cylinders.

Will this fit a Buick Special or Buick Century?
It depends on the year. The Buick Special used the Nailhead V8 from 1954 through 1960. From 1961 onward, the Special used the small block 215 or 300 CID, which is a completely different engine. This distributor fits the 1954–1960 Nailhead Special only. The Buick Century used the Nailhead from 1954 through 1958, when the Century nameplate was discontinued. This distributor fits the 1954–1958 Nailhead Century.

Does this distributor fit the Buick Riviera?
Yes, for the first-generation Riviera (1963–1966) equipped with the 401 or 425 CID Nailhead V8. The 1967 and later Riviera used the 430 CID big block, which is a different engine family and is not compatible with this distributor.

What is the difference between this Pro Series distributor and an HEI distributor for the Nailhead?
The Pro Series Ready-to-Run uses a circuit board module with magnetic pickup and requires an external ignition coil (35,000V minimum, not included). An HEI distributor integrates the coil directly into the cap and requires only a single 12V wire. The Pro Series gives you greater advance curve flexibility through the included bushings and springs, a vacuum advance block-off plate for performance builds, and a tachometer output cable. It is the better choice for modified or performance-oriented Nailhead builds where advance curve tuning matters. For a simpler street or restoration installation, check whether TSP offers an HEI version for the Nailhead.

Does this distributor include a coil?
No. This is a Ready-to-Run design that requires an external ignition coil rated at 35,000 volts or higher. The coil is not included and must be sourced separately.

Do I need an external ignition box or CDI unit?
No. The internal ignition module handles all ignition control. No external ignition box, CDI unit, points, or condenser is required.

What is included with this distributor?
This distributor ships with three advance bushings and four advance springs for mechanical advance curve tuning, a color-matched spark plug wire retainer with screws, a vacuum advance block-off plate in black, a power extension cable, and a tachometer output extension cable.

Can I tune the advance curve on this distributor?
Yes. Three advance bushings and four advance springs are included, allowing you to adjust how quickly mechanical advance comes in with rising RPM. On Nailhead builds running modified camshafts, higher compression, or performance carburetors, tuning the advance curve can meaningfully improve power delivery and part-throttle drivability compared to a fixed factory-style advance.

What type of distributor gear is included, and what camshafts is it compatible with?
This distributor includes a steel distributor gear. The gear is most compatible with cast iron hydraulic or solid flat tappet camshafts. For roller camshaft applications, consult your camshaft manufacturer for the recommended gear material — using an incompatible gear and cam combination will cause accelerated wear on both components.

Does this distributor have a tachometer output?
Yes. A digital tachometer output is built into the distributor and a tachometer output extension cable is included, making it straightforward to connect an aftermarket electronic tachometer without a separate signal adapter.

Do I need to set ignition timing after installing this distributor?
Yes. Base ignition timing must be set with a timing light after installation. Optimal timing on the Nailhead varies by displacement and build specification. For most stock or mildly modified carbureted Nailhead applications, a starting base timing of 8–12 degrees BTDC at idle is a common reference, but your specific compression ratio, camshaft selection, and advance curve setup will determine the final optimal setting.

Is this distributor compatible with a 6-volt system or generator?
No. This distributor requires a 12-volt electrical system with a charging alternator. It is not compatible with 6-volt systems, generators, or ballast resistors. Many early Nailhead vehicles left the factory with 6-volt electrical systems and generators, so confirm your vehicle has been converted to a 12-volt alternator system before ordering.