Buick Odd Fire V6 HEI Distributor Long Shaft - Black
Buick Odd Fire V6 HEI Distributor Long Shaft - Black
SKU: SKU: JM6529-1BK
In stock
Product Details
Features
- Long-shaft HEI design — fits 1966–1971 Dauntless 225 Jeep and early Buick odd-fire V6
- 65,000-Volt internal HEI coil — single 12V wire, no external coil or box needed
- Fits Jeep CJ5, CJ6, Commando, Jeepster Dauntless 225 — manifold mod may be required
- Mechanical and vacuum advance — vacuum adjustment tool and instructions included
Description
Built for reliable ignition control and smooth engine operation, this distributor delivers dependable spark energy and consistent timing performance for compatible Buick, Pontiac, and Oldsmobile engine applications.
Specs
| Trigger Type | Magnetic |
| Advance Type | Mechanical and Vacuum |
| Color | Available in Black and Red |
| Terminal Gender | Male |
| Mechanical Tach Drive | No |
| Slip Collar | No |
| Coil Included | Yes |
| Coil Type | Internal |
| Coil Output | 65000 V |
| Gear Material | Steel |
| Housing Material | Machined Aluminum |
| Ignition Box Required | No |
| Marine Use | No |
| Cylinders | 6 |
| Vacuum Advance Adjustment Tool | Included |
| Installation Instructions | Included |
Engine Fitment
COMPATIBLE WITH
BUICK 90° V6 (ODD-FIRE)
• 3.7L / 225 in³
• 3.8L / 231 in³ (odd-fire only, 1975–1976; early 1977)
NOTES
• Long-shaft design required for 1966–1971 Dauntless 225 and early Buick odd-fire V6 engine block depth — not interchangeable with the short-shaft 1975–1977 version
• Not compatible with later Buick even-fire V6 engines (1977 and newer).
• Not compatible with Buick 3800 V6 or front-wheel-drive applications.
• Designed for carbureted HEI ignition systems only.
• This distributor is designed for a 12 volt electrical system with an alternator.
• It is not compatible with a generator and cannot be used with a ballast resistor.
• Verify distributor gear compatibility with camshaft material before installation.
COMMON VEHICLE APPLICATIONS
Buick Apollo (1975)
Buick Skyhawk (1975–1976)
Buick Skylark (1975–1976)
Buick Century (1975–1976)
Buick Regal (1975–1976)
Buick LeSabre (1976)
Oldsmobile Starfire (1975–1976)
Pontiac Sunbird (1976)
Pontiac Firebird (1977; early odd-fire production only)
Q&A
What engines and vehicles does this distributor fit?
This distributor fits Buick 90° odd-fire V6 engines, including the 225 CID (3.7L) Dauntless V6 used in 1969–1971 Jeep CJ-5, CJ-6, Jeepster Commando, DJ-5, Dispatcher, and Universal Truck applications. It also fits the 231 CID (3.8L) odd-fire V6 used in 1975–1977 Buick, Oldsmobile, and Pontiac rear-wheel-drive passenger cars. A slight intake manifold modification may be required on Dauntless 225 Jeep applications.
What is the difference between the TSP short-shaft and long-shaft Buick odd-fire V6 HEI distributors?
The difference is distributor shaft length. The short-shaft version fits 1975–1977 Buick 231 odd-fire passenger car engines, while the long-shaft version fits 1966–1971 Dauntless 225 Jeep applications. Using the wrong shaft length will prevent proper engagement with the oil pump drive.
What is the Dauntless 225 V6, and does this distributor fit it?
The Dauntless 225 is the 3.7L Buick odd-fire V6 used in Jeep vehicles from 1966–1971. Yes, this distributor is compatible, although a slight intake manifold modification may be required for clearance.
What is the difference between an odd-fire and even-fire Buick V6, and how do I know which one I have?
Odd-fire Buick V6 engines use uneven 90°/150° firing intervals, while even-fire engines use even 120° firing intervals. These distributors are not interchangeable. Because both odd-fire and even-fire 231 engines were produced during the 1977 model year, verify your engine casting number or VIN before ordering.
Does this distributor include an ignition coil?
Yes. The HEI ignition coil is built into the distributor cap, eliminating the need for an external ignition coil.
Do I need an external ignition box or control module?
No. The ignition module is built into the distributor, so no external ignition box, CDI unit, points, or condenser is required.
What is the coil output voltage on this distributor?
This distributor delivers up to 65,000 volts of spark output for improved starting, idle quality, and throttle response compared to factory points ignition.
Does this distributor fit a 1977 Buick, Oldsmobile, or Pontiac with a V6?
It depends on the engine. This distributor fits only the odd-fire 231 V6. Since both odd-fire and even-fire engines were produced during 1977, verify your engine before purchasing.
Will this distributor fit the Buick 3800 V6?
No. This distributor is not compatible with any Buick 3800 V6 engine.
Does this distributor fit front-wheel-drive Buick or GM vehicles?
No. It is designed only for rear-wheel-drive, carbureted Buick odd-fire V6 applications.
What type of advance does this distributor use?
It features both mechanical (centrifugal) and vacuum advance. A vacuum advance adjustment tool is included to help fine-tune the ignition curve.
What type of distributor gear is included?
A steel distributor gear is included. It is compatible with cast iron camshafts and many aftermarket steel camshafts. Verify compatibility if using a bronze or specialty cam gear.
Is this distributor compatible with a 6-volt electrical system?
No. This distributor requires a 12-volt electrical system and is not compatible with 6-volt systems, generators, or ballast resistors.
Do I need to set ignition timing after installing this distributor?
Yes. Base ignition timing should be set with a timing light after installation. Final timing will depend on your engine combination and tuning requirements.
Emissions Notice
This Top Street Performance (TSP) product is designed for racing and off-road competition use only. It is not legal for use on public roads or emissions-controlled vehicles and does not comply with federal, state, or local emissions regulations. The buyer assumes all responsibility for legal use and installation.
What is a Emissions-Controlled Vehicle?
"An emissions-controlled vehicle is any vehicle equipped with a factory-installed emissions control system designed to reduce air pollution. These systems include catalytic converters, oxygen sensors, EGR (Exhaust Gas Recirculation) valves, and diesel particulate filters (DPF). Most vehicles manufactured after 1975 are considered emissions-controlled and must comply with federal and state emissions laws when used on public roads."
Buick Odd Fire V6 HEI Distributor Long Shaft - Black
The TSP HEI Distributor for the Buick 90° odd-fire V6 is a self-contained large-cap HEI ignition upgrade covering both the Dauntless 225 CID (3.7L) V6 used in 1966–1971 Jeep applications and the 231 CID (3.8L) odd-fire V6 used in 1975–1977 Buick, Oldsmobile, and Pontiac passenger car applications. The integrated HEI design combines the ignition coil, ignition module, cap, and rotor into a single unit with a single 12-volt connection — no external coil, ignition box, condenser, or points required.
The 65,000-volt internal HEI coil delivers substantially stronger spark output than a factory points-style distributor, supporting easier cold starts, cleaner idle quality, and more consistent ignition performance across the RPM range. A magnetic pickup trigger replaces mechanical points contact, holding timing accurately without routine maintenance.
For Jeep Dauntless 225 builders, this is one of the most direct HEI ignition upgrade paths available for the 1966–1971 CJ5, CJ6, Jeepster Commando, DJ5, and early Universal Truck applications using the 90° odd-fire V6. A slight intake manifold modification may be required for distributor clearance in Jeep applications. For 1975–1977 Buick passenger car applications, this distributor is a direct-fit replacement for the odd-fire 231 ignition system.
Both mechanical and vacuum advance are included, with a vacuum advance adjustment tool shipped with the distributor. Available in black finish only.
The Buick 90° Odd-Fire V6 — Two Eras, One Distributor
The Buick 90° V6 has two distinct odd-fire production eras. The first is the 225 CID (3.7L) Dauntless V6, sold by Buick to American Motors in 1965 and used in Jeep vehicles from 1966 through 1971 — including the CJ5, CJ6, Jeepster Commando, DJ5, Universal Truck, and Dispatcher. The second is the 231 CID (3.8L) odd-fire V6, reintroduced by Buick in 1975 and used across multiple GM divisions through the 1977 model year before GM transitioned to the even-fire crankshaft design. Both generations share the same 90° odd-fire architecture, and this HEI distributor covers both applications.
An HEI upgrade replaces the entire factory points and condenser system with an integrated coil, ignition module, and magnetic trigger in one sealed unit. The result is stronger spark, more accurate timing, and a system that requires no routine contact maintenance — a particularly meaningful improvement on older Jeep Dauntless V6 engines where points-style ignition components have often been in service for decades.
Performance Benefit
With 65,000 volts of integrated coil output and a magnetic pickup trigger, this HEI distributor fires spark plugs more reliably than a stock points setup across the full RPM range. Stronger, more consistent spark translates to easier cold starts, cleaner idle quality, and improved throttle response — especially noticeable on Jeep Dauntless builds and restored 1970s GM vehicles running carbureted ignition systems. Both mechanical and vacuum advance are included, and the vacuum advance adjustment tool allows the vacuum advance curve to be tuned to your specific application.
COMPATIBLE WITH
BUICK 90° V6 (ODD-FIRE)
• 3.7L / 225 in³
• 3.8L / 231 in³ (odd-fire only, 1975–1976; early 1977)
NOTES
• Fits Buick 90° V6 odd-fire engines (225 and early 231).
• Not compatible with later Buick even-fire V6 engines (1977 and newer).
• Not compatible with Buick 3800 V6 or front-wheel-drive applications.
• Designed for carbureted HEI ignition systems only.
• This distributor is designed for a 12 volt electrical system with an alternator.
• It is not compatible with a generator and cannot be used with a ballast resistor.
• Verify distributor gear compatibility with camshaft material before installation.
COMMON VEHICLE APPLICATIONS
Buick Apollo (1975)
Buick Skyhawk (1975–1976)
Buick Skylark (1975–1976)
Buick Century (1975–1976)
Buick Regal (1975–1976)
Buick LeSabre (1976)
Oldsmobile Starfire (1975–1976)
Pontiac Sunbird (1976)
Pontiac Firebird (1977; early odd-fire production only)
SPECIFICATIONS
Distributor Type: HEI
Advance Type: Mechanical and Vacuum Advance
Voltage Requirement: 12 Volt
Tachometer Compatible: Yes
