Buick Big Block V8 Pro Series Ready to Run Distributor

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

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

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

• Clockwise rotation — machined aluminum housing, steel distributor gear

The TSP Pro Series Ready-to-Run Distributor for the Buick big block V8 delivers precise, adjustable ignition performance across the full Buick big block family — 400 CID (6.6L), 430 CID (7.0L), and 455 CID (7.5L) — in carbureted applications from 1967 through 1976. Built on a machined aluminum housing with a circuit board module and magnetic pickup trigger, this distributor provides accurate and repeatable ignition timing without the need for points, condenser, or a separate ignition control box.

Unlike an HEI design, the Pro Series uses an external ignition coil — giving you flexibility to select a coil matched to your build — while the internal module eliminates the need for a separate ignition control box or CDI unit. Clockwise distributor rotation matches standard Buick big block architecture. A minimum coil output of 35,000 volts is required — coil is not included.

Three advance bushings and four advance springs are included, allowing the mechanical advance curve to be tailored to your engine's camshaft profile, compression ratio, and carburetor tune. A vacuum advance block-off plate is included for race and performance builds where vacuum advance is not desired. A tachometer output extension cable is included for straightforward aftermarket tach wiring without additional adapters.

The Buick big block powered some of the most sought-after American performance vehicles of the late 1960s and early 1970s — from the GS 400 and GS 455 to the Riviera 455, Wildcat 430, and the full-size LeSabre and Electra. Whether you are building a GS 455 for the street, refreshing a Riviera big block, or restoring a Wildcat 430, the Pro Series Ready-to-Run provides the advance tunability and build quality that a stock points distributor or basic HEI replacement cannot match.

Why Choose the Pro Series Over the Buick Big Block HEI?
The TSP big block HEI distributor is an excellent street and restoration upgrade — integrated coil, one wire, direct replacement simplicity. The Pro Series Ready-to-Run is the step up for builders who want more control. The external coil setup lets you choose a coil matched to your ignition system and build level. The advance tuning kit — three bushings and four advance springs — lets you actually dial in how timing advances across the RPM range rather than running a fixed factory-style curve. For a stock rebuild or basic restoration, the HEI is the right call. For a performance street build, a modified engine, or any application where advance curve behavior matters, the Pro Series delivers what the HEI cannot.

Performance Benefit
The circuit board module and magnetic pickup trigger deliver precise, repeatable spark timing without the wear and drift inherent in points contact. The included bushings and springs allow full customization of the mechanical advance curve — a genuine advantage on Buick big block builds running aftermarket camshafts, elevated compression, or performance carburetors where a stock advance ramp undersells the engine's potential. The vacuum advance block-off plate gives race and performance builds the option to run full mechanical advance control without vacuum advance influence. A tachometer output extension cable is included, making aftermarket tach wiring straightforward without additional adapters.

What Buick big block engines 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, Gran Sport, Skylark Gran Sport, Electra, and Wildcat (1967–1970); and the GS 455, GSX, Skylark, Riviera, LeSabre, Electra, Estate Wagon, Centurion, Century, and Regal in applicable big block years through 1976. Not compatible with Buick small block (300–350), Buick Nailhead (264–425), or any Pontiac or Oldsmobile V8.

What is the difference between this Pro Series distributor and the TSP Buick big block HEI distributor?
The HEI distributor integrates the ignition coil directly into the cap, connects to a single 12V wire, and requires no external coil, making it the simpler, lower-cost option for street and restoration 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 Pro Series is the better choice for performance builds where the mechanical advance curve needs to be matched to your specific camshaft, compression ratio, and carburetor tune.

What is the difference between the Buick big block and the Buick Nailhead—do they use the same distributor?
No. The Buick Nailhead (264–425 CID, 1953–1966) and the Buick big block (400–455 CID, 1967–1976) are completely separate engine families that require different distributors. One key difference is distributor rotation—the Nailhead runs counter-clockwise while the Buick big block 400/430/455 runs clockwise. Installing the wrong distributor or wiring the plug leads based on the wrong rotation direction will result in misfires.

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 adjustment of how quickly mechanical advance comes in with rising RPM. For Buick big block builds running aftermarket camshafts, modified compression, or performance carburetors, a properly tuned advance curve can meaningfully improve power delivery and part-throttle drivability compared to a fixed factory advance setup.

Does this distributor have a tachometer output?
Yes. A tachometer output extension cable is included for connecting an aftermarket electronic tachometer without a separate signal adapter.

What direction does this distributor rotate?
This distributor rotates clockwise, consistent with the standard Buick big block V8 architecture. Note that the Buick Nailhead V8 (264–425 CID) runs counter-clockwise rotation. If you are working with a Nailhead, a different TSP distributor is required.

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, as using an incompatible gear and cam combination 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 specific compression ratio, camshaft profile, advance spring and bushing selection, 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.