Buick BB 400-455 V8 HEI Distributor

• Fits Buick big block 400, 430, and 455 V8 — 1967–1976 carbureted applications

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

• Fits GS 400, GS 455, Riviera, Electra, Wildcat, LeSabre, and more

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

The TSP HEI Distributor for the Buick big block V8 is a self-contained large-cap HEI ignition upgrade for the full Buick big block family — 400 CID (6.6L), 430 CID (7.0L), and 455 CID (7.5L) — in carbureted applications spanning the 1967 through 1976 Buick big block 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.

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. Both mechanical and vacuum advance are included, with a vacuum advance adjustment tool shipped with the distributor for advance curve tuning.

The Buick 400 and 430 powered the Gran Sport, Electra, Wildcat, Skylark, and Sportwagon from 1967 through 1969 before giving way to the 455 in 1970 — which went on to power the GS 455, Riviera, LeSabre, Electra, Estate Wagon, Centurion, Century, and Regal through 1976. Whether you are restoring a GS 400, refreshing a first-gen Riviera 455, or rebuilding a Wildcat or Electra big block, this HEI distributor provides reliable ignition performance with minimal wiring complexity.

The Buick Big Block V8 — 400, 430, and 455
The Buick big block V8 is a distinct engine family produced from 1967 through 1976, separate from both the Buick Nailhead (1953–1966) and the Buick small block (215–350 CID). The 400 and 430 CID engines debuted in 1967 and powered Buick's performance and luxury vehicles through 1969. The 455 CID replaced both in 1970 and became the standard big block option across Buick's full lineup — appearing in the legendary GS 455, the Grand Sport Riviera, the full-size LeSabre, Electra, and Estate Wagon, and the personal luxury Centurion and Regal — before being discontinued after 1976 due to evolving emissions requirements. These engines are not related to the Buick Nailhead or small block despite sharing the Buick name, and they require their own distributor specific to the big block architecture.

Performance Benefit
Replacing a worn or points-style distributor on any Buick big block with an HEI unit delivers measurable improvements in starting reliability, idle quality, and throttle response. The 65,000-volt internal HEI coil fires spark plugs more consistently than a factory points setup across the full RPM range, and 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 advance curve to be tuned for your specific build and driving conditions.

What Buick big block engines and vehicles does this distributor fit?
This distributor fits the Buick big block V8 — 400 CID (6.6L, 1967–1969), 430 CID (7.0L, 1967–1969), and 455 CID (7.5L, 1970–1976) — in carbureted applications. Supported vehicles include the Buick GS 400, Skylark Gran Sport, Electra, and Wildcat (1967–1970); and the GS 455, Skylark, Riviera, LeSabre, Electra, Estate Wagon, Centurion, Century, and Regal in applicable big block years through 1976. This distributor is not compatible with Buick small block engines (300, 340, 350), the Buick Nailhead (264–425 CID), or any Pontiac or Oldsmobile V8.

What is the difference between the Buick big block 400/430/455 and the Buick Nailhead 401/425?
Despite the similar displacement numbers, the Buick Nailhead 401 and the Buick big block 400 are completely different engines. The Nailhead was produced from 1953 through 1966 and is named for its small, upright valve design. The big block 400/430/455 is a modern OHV design introduced in 1967 as a replacement for the Nailhead. They share no interchangeable components, including distributors. The Nailhead also runs counter-clockwise distributor rotation, while the big block rotation should be verified with TSP for your specific application.

Will this distributor fit a Buick GS or Gran Sport?
Yes, for the following Gran Sport and GS applications equipped with the big block V8: the GS 400 (1967–1969) with the 400 CID big block, and the GS 455 (1970–1975) with the 455 CID big block. Gran Sport and GS models equipped with small block engines are not compatible with this distributor.

Will this fit a Buick Riviera?
Yes, for the 1970–1974 Buick Riviera equipped with the 455 CID big block V8. The 1963–1966 Riviera used the Nailhead 401 or 425, which requires a different distributor. Verify fitment for 1975 and later Riviera models with TSP before ordering.

Will this fit a Buick Apollo?
No. The Buick Apollo (1973–1974) used the small block 350 CID engine, not the big block 400/430/455. This distributor is not compatible with the Apollo or any other Buick small block application.

Is this the same as a Pontiac 400/455 or Oldsmobile 455 distributor?
No. Despite sharing displacement numbers, the Buick 400/430/455 big block, Pontiac 400/428/455, and Oldsmobile 400/425/455 are entirely different engines produced by separate GM divisions. Each requires its own application-specific distributor. This distributor fits Buick big block applications only.

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.

What type of distributor gear is included?
This distributor includes a steel distributor gear. Steel gears are compatible with cast iron camshafts and most aftermarket steel camshafts. If your engine has a roller camshaft with a bronze or softer alloy cam gear, verify gear compatibility before installation, as mismatched gear and cam material will cause accelerated wear on both components.

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 Buick 455 applications, a starting point of 8–12 degrees BTDC at idle is a common reference, though the optimal setting will vary based on your compression ratio, camshaft profile, and carburetor tune.

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.

Does this distributor have a mechanical tachometer drive or tachometer output?
No. This distributor does not include a mechanical tachometer drive. Vehicles requiring a tachometer signal will need an electronic tachometer with a compatible signal adapter.