Buick Nailhead V8 HEI Distributor

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

• Counter-clockwise rotation — verify plug wire routing before finalizing installation

• 65,000-Volt internal HEI coil — single 12V wire, no external coil or box needed

• Mechanical and vacuum advance — vacuum adjustment tool and instructions included

The TSP HEI Distributor for the Buick Nailhead V8 is a self-contained large-cap HEI ignition upgrade covering the complete 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 across the full 1953–1966 Nailhead production era. The integrated HEI design combines the ignition coil, ignition module, cap, and rotor into a single unit, connecting to a single 12-volt source with no external coil, ignition box, or condenser required.

Counter-clockwise rotation: The Buick Nailhead V8 runs 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. Do not assume standard clockwise plug wire layout. Verify your firing order and wire routing for counter-clockwise rotation before finalizing installation.

The 65,000-volt internal HEI coil delivers substantially stronger spark than a factory points-style distributor, supporting easier cold starts, cleaner idle quality, and more consistent ignition performance across the full RPM range. A magnetic pickup trigger replaces the mechanical points contact and requires no routine maintenance — a meaningful advantage on Nailhead engines where original ignition components are now sixty-plus years old. Both mechanical and vacuum advance are included, with a vacuum advance adjustment tool shipped with the distributor for advance curve tuning.

The Buick Nailhead powered the full range of Buick's lineup from 1953 through 1966 — from the Special, Century, Super, and Roadmaster of the 1950s to the LeSabre, Invicta, Electra, Wildcat, and first-generation Riviera of the early 1960s. Whether you are restoring a 1950s Buick, refreshing a 401-powered LeSabre or Invicta, or upgrading the ignition on a first-gen Riviera 425, this HEI distributor provides reliable ignition performance with minimal wiring complexity.

The Buick Nailhead V8 — Understanding the Engine and Why Ignition Accuracy Matters
The Buick Nailhead V8 is a distinct and iconic American engine produced exclusively by Buick from 1953 through 1966. It is not related to the Buick small block (215–350) or the later Buick big block (400–455) — it is its own engine family spanning five displacements across thirteen model years. Named for its characteristic small upright valves, the Nailhead powered some of Buick's most celebrated vehicles and became a fixture in American hot rod and custom culture, particularly in the 401 and 425 CID forms. Factory points-style ignition systems on these engines are now decades old and benefit significantly from an HEI upgrade — especially on engines that have been rebuilt, recarbureted, or modified for performance.

Performance Benefit
The 65,000-volt internal HEI coil fires spark plugs more consistently than a factory points setup across the full RPM range, delivering improvements in cold-start reliability, idle quality, and part-throttle drivability. The magnetic pickup trigger holds timing accurately without the wear and drift that accumulates with points contact over time. Both mechanical and vacuum advance are included, and the vacuum advance adjustment tool allows the vacuum curve to be tuned for your specific Nailhead combination and driving conditions.

What Buick Nailhead engines and vehicles 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 Roadmaster (1953–1958), Super (1953–1958), Special (1954–1958), Century (1954–1958), Skylark (1954), Limited (1958), Invicta (1959–1963), LeSabre (1959–1964), Estate Wagon (1959–1964), Electra (1959–1966), Wildcat (1962–1966), Riviera (1963–1966), and Gran Sport/Skylark Gran Sport (1965–1966). This distributor is not compatible with Buick small block engines (300, 340, 350), later Buick big block engines (400, 430, 455), or any Pontiac or Oldsmobile application.

The Buick Nailhead runs counter-clockwise rotation — does this distributor account for that?
Yes. This distributor is designed 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, so do not assume standard clockwise wire layout applies to the Nailhead. Wiring the plug leads using a clockwise assumption will produce misfires across multiple cylinders.

What is the difference between this HEI distributor and the TSP Nailhead Pro Series Ready-to-Run?
The HEI distributor integrates the ignition coil directly into the distributor cap, connects to a single 12-volt wire, and requires no external coil, making it the simpler option for street, restoration, and daily-driven Nailhead builds. The Pro Series Ready-to-Run requires an external ignition coil (35,000V minimum, not included) but includes three advance bushings, four advance springs, a vacuum advance block-off plate, and a tachometer output extension cable for greater advance curve tunability. The HEI is the right choice for straightforward ignition upgrades, while the Pro Series is better suited for performance builds where tuning the advance curve matters.

Does this distributor include an ignition coil?
Yes. The ignition coil is built into the distributor cap as part of the HEI design. No external coil is required. The only external connection needed is a single 12-volt hot wire.

Do I need an external ignition box or control module?
No. The ignition control module is integrated internally within the distributor. No external ignition box, CDI unit, points, or condenser is required.

What is the coil output voltage?
This distributor produces 65,000 volts of coil output—significantly higher than a factory points-style distributor—delivering a stronger, more consistent spark for improved cold starts, idle stability, and throttle response.

Will this fit a Buick Skylark or Buick GS?
It depends on the year and model. The only Skylark application for this distributor is the 1954 Skylark, which used the Nailhead V8. From 1961 onward, the Skylark used the small block 215 or 300, which is not compatible with this distributor. For the Gran Sport/GS, this distributor fits the 1965–1966 Buick Gran Sport and Skylark Gran Sport equipped with the 401 Nailhead. Other GS models used the small block and are not compatible.

Will this fit a Buick Apollo?
No. The Buick Apollo (1973–1974) used the small block 350 CID engine, not the Nailhead. This distributor is not compatible with the Apollo or any other Buick small block application.

Is this compatible with the Buick 400, 430, or 455 big block?
No. The Buick 400, 430, and 455 are later big block engines that are completely separate from the Nailhead family. This distributor is not compatible with any of these engines. Despite the 401 Nailhead sometimes being called the "400," it is a different engine from the later Buick 400/430/455 big block series.

Does this distributor have a tachometer output or mechanical tach drive?
No. This distributor does not include a mechanical tachometer drive or a dedicated tachometer output signal cable. If a tachometer output is required for your build, the TSP Nailhead Pro Series Ready-to-Run distributor includes a tachometer output extension cable.

What type of distributor gear is included?
This distributor includes a steel distributor gear. Steel gears are compatible with cast iron hydraulic and solid flat tappet camshafts. For roller camshaft applications, consult your camshaft manufacturer for the recommended gear material before installation.

Do I need to set ignition timing after installing this distributor?
Yes. Base ignition timing must be set with a timing light after installation. For most carbureted Nailhead applications, a starting point of 8–12 degrees BTDC at idle is a common reference, though the optimal setting will vary based on your displacement, compression ratio, camshaft profile, and carburetor tune.

Is this distributor compatible with a 6-volt electrical 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—particularly pre-1956 Buicks—left the factory with 6-volt electrical systems. Confirm your vehicle has been converted to a 12-volt system with a charging alternator before ordering.