Chevy BB 348/409 V8 Pro Series Pro Billet Distributor

Pro Billet Distributor for the Chevrolet W-Series Big Block 348 and 409 CID V8

The Chevrolet W-Series big block is a distinct engine family — produced from 1958 through 1965 in 348 and 409 CID displacements — and it requires a distributor built specifically for it. This TSP Pro Series Pro Billet distributor is engineered for the W-Series and is not interchangeable with later Mark IV big block applications (396, 402, 427, 454). If you're building a performance 348 or 409 in an Impala, Bel Air, Biscayne, or C-series truck and want distributor-level control over your ignition system, this is the purpose-built Pro Billet solution for that engine.

The compact billet-style machined aluminum housing is precision-built for dimensional accuracy and provides additional clearance in performance engine bays where space around the distributor is limited. A magnetic trigger delivers a clean, consistent signal to your external ignition control box and coil across the full RPM range. Mechanical advance with three tunable bushings and four springs gives you direct control over your total advance curve — dial it in to your specific camshaft profile, carburetor setup, and intended use.

The adjustable slip collar allows you to fine-tune distributor phasing independently of the housing position — a key advantage when performing precision ignition tuning or working with a custom timing setup on a performance W-Series build. The steel gear is most compatible with cast iron hydraulic and solid flat-tappet camshafts; verify gear material compatibility with your camshaft manufacturer if your build uses a roller or specialty cam profile.

 

Applications
Designed exclusively for the Chevrolet W-Series Big Block Gen. I V8 — 5.7L / 348 CID and 6.7L / 409 CID. Not compatible with Mark IV big block engines (396, 402, 427, 454). Confirmed common vehicle applications include Chevrolet Impala, Bel Air, Biscayne, C10, C20, and K10. Suited for carbureted performance builds and high-output street applications on W-Series equipped vehicles from the 1958–1965 production era.

COMPATIBLE WITH
CHEVROLET BIG BLOCK GEN. I (W) V8
• 5.7 L / 348 in³
• 6.7 L / 409 in³

NOTES
• Fits Chevrolet W-series big block engines only (348 and 409).
• The 409 was available in passenger cars only — not available in trucks.
• Not compatible with later Mark IV big block Chevy engines (396, 402, 427, 454).
• Mechanical advance only — no vacuum advance canister.
• Requires an external ignition box — not included.
• Designed for carbureted ignition systems only.
• Distributor gear compatibility should be verified with camshaft material prior to installation.
• This distributor is designed for a 12 volt electrical system with an alternator and a performance ignition coil of 35,000 V or more. 
• It is not compatible with a generator and cannot be used with a ballast resistor.

COMMON VEHICLE APPLICATIONS
Chevrolet Impala / Impala SS (348, 1958–1961; 409, 1961–1965)
Chevrolet Bel Air (348, 1958–1961; 409, 1961–1965)
Chevrolet Biscayne / Delray (348, 1958–1961; 409, 1961–1965)
Chevrolet El Camino (348, 1959–1960)
Chevrolet Suburban (348, 1958–1961)
Chevrolet C10 / C20 / K10 (348 truck only, 1958–1964)

SPECIFICATIONS
Trigger Type: Magnetic
Advance Type: Mechanical
Cap Color: Available in Black, Blue, Red
Terminal Gender: Male
Mechanical Tach Drive: No
Slip Collar: Yes
Coil Included: No
Coil Type: External
Coil Output: 35,000+ V
Gear Material: Steel
Housing Material: Machined Aluminum
Ignition Box Required: Yes
Marine Use: No
Cylinders: 8
3 Bushings And 4 Springs for Mechanical Advance: Included
Color-Matched Spark Plug Wire Retainer with Screws: Included