Chevy Small & Big Block V8 Pro Series Ready to Run Distributor with Adjustable Collar
The TSP Pro Series Ready-to-Run Distributor with Adjustable Collar for the Chevy SBC and BBC delivers everything in the TSP Pro Series Ready-to-Run (JM7715) — advance curve tunability, tachometer output, vacuum advance block-off plate, and an integrated ignition module requiring no external ignition box — plus a precision adjustable collar that locks the distributor in position after timing is set. This is the top of the TSP Chevy carbureted distributor lineup for builders who want Pro Series performance with the timing precision and security of a slip collar.
What the adjustable collar adds: The slip collar clamps around the distributor housing at the engine block, allowing the distributor to be rotated for precise timing adjustment and then locked firmly in position. Standard distributor hold-down clamps rely on a single bolt against the outside of the housing — under high-RPM operation and engine vibration, this can allow the distributor to shift and alter ignition timing. The adjustable collar eliminates this by securing the housing in a precise, fixed position once timing is confirmed. For the $35 premium over JM7715, the collar provides meaningful timing stability on high-performance street builds and track-day vehicles where timing security matters.
Distributor rotation is clockwise — standard for the Chevy SBC and BBC. An external ignition coil rated at 35,000 volts or higher is required — the coil is not included. No external ignition control box is needed — the ignition module is integrated internally.
Three advance bushings and four advance springs are included for mechanical advance curve tuning. A vacuum advance block-off plate is included for performance builds where vacuum advance is not needed. A tachometer output extension cable, power extension cable, and color-matched spark plug wire retainer with screws are also included.
Adjustable Collar vs. Standard Hold-Down — What It Actually Does
On a standard distributor without a collar, timing is set by rotating the distributor housing and then tightening a single hold-down clamp bolt against the outside of the housing. This works adequately on most street applications, but the clamping force is indirect — the bolt presses against one side of the housing and relies on friction to hold position. Under sustained high-RPM operation and engine vibration, this friction can be overcome and the distributor can rotate slightly, shifting ignition timing from where it was set.
The adjustable collar on this distributor solves this directly. The collar is a precision ring that wraps around the distributor housing body and clamps with even, circumferential force — locking the distributor in the exact position where timing was confirmed. The collar can be loosened for adjustment, the distributor rotated to the correct position, and then the collar re-tightened to lock timing precisely in place. This provides a significantly more secure hold than a standard clamp, particularly under high-RPM and high-vibration conditions.
Pro Series R2R vs. Pro Series R2R with Collar — The $35 Decision
The standard Pro Series Ready-to-Run (JM7715) and this collar version (JM7716) are otherwise identical — same integrated module, same advance kit, same advance block-off plate, same tachometer output, same external coil requirement, same engine fitment. The $35 premium is entirely for the adjustable collar. If timing security under high-RPM conditions is a concern in your build, this is a straightforward upgrade. If a standard hold-down is acceptable for your application, JM7715 is the correct unit.
Performance Benefit
The integrated circuit board module and magnetic pickup deliver precise, repeatable spark timing without the wear and drift of points-based systems. Three advance bushings and four advance springs allow the mechanical advance curve to be matched precisely to your engine's camshaft, compression ratio, and carburetor calibration. A vacuum advance block-off plate is included for builds preferring full mechanical advance only. A tachometer output extension cable simplifies aftermarket tach wiring without adapters.
COMPATIBLE WITH
CHEVROLET SMALL BLOCK V8 GEN. I
• 4.3 L / 262 in³
• 4.3 L / 265 in³
• 4.4 L / 267 in³
• 4.6 L / 283 in³
• 4.9 L / 302 in³
• 5.0 L / 305 in³
• 5.0 L / 307 in³
• 5.4 L / 327 in³
• 5.7 L / 350 in³
• 6.6 L / 400 in³
CHEVROLET BIG BLOCK V8 GEN. II (MARK IV) — STANDARD DECK ONLY
• 6.5 L / 396 in³
• 6.6 L / 402 in³
• 7.0 L / 427 in³
• 7.4 L / 454 in³
NOTES
• Fits Chevrolet Gen. I small block and Gen. II (Mark IV) standard deck big block V8 engines.
• Adjustable slip collar allows proper distributor depth setup without rotating engine to TDC.
• Ready-to-run design — internal ignition module eliminates the need for an external ignition box.
• Not compatible with tall deck big block engines (366ci, tall deck 427ci truck engines).
• Not compatible with LS or Gen V LT engine platforms.
• 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 Camaro (1967–1981)
Chevrolet Chevelle / Malibu / El Camino (1964–1977)
Chevrolet Nova (1966–1979)
Chevrolet Impala / Bel Air / Biscayne (1955–1976)
Chevrolet Corvette (1955–1982)
Chevrolet Monte Carlo (1970–1977)
Chevrolet C/K Trucks (1955–1987)
GMC C/K Trucks (1955–1987)
SPECIFICATIONS
Trigger Style: Circuit Board Module with Magnetic Pick-up
Distributor Rotation: Clockwise
Advance Type: Mechanical and Vacuum
Cap Style: Male
Mechanical Tach Drive: No
Slip Collar: Adjustable
Coil Included: No
Coil Type: External
Required Coil Output: 35,000+ Volts
Required Electrical Set-up: 12 Volt with Alternator
Gear Material: Steel
Housing Material: Machined Aluminum
Ignition Box Required: No
Marine Use: No
Cylinders: 8
Included: 3 Bushings and 4 Springs for Mechanical Advance
Color-Matched Spark Plug Wire Retainer with Screws
Vacuum Advance Block-off Plate (Black)
Power Extension Cable
Tachometer Output Extension Cable
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The TSP Pro Series Ready-to-Run Distributor with Adjustable Collar for the Chevy SBC and BBC delivers everything in the TSP Pro Series Ready-to-Run (JM7715) — advance curve tunability, tachometer output, vacuum advance block-off plate, and an integrated ignition module requiring no external ignition box — plus a precision adjustable collar that locks the distributor in position after timing is set. This is the top of the TSP Chevy carbureted distributor lineup for builders who want Pro Series performance with the timing precision and security of a slip collar.
What the adjustable collar adds: The slip collar clamps around the distributor housing at the engine block, allowing the distributor to be rotated for precise timing adjustment and then locked firmly in position. Standard distributor hold-down clamps rely on a single bolt against the outside of the housing — under high-RPM operation and engine vibration, this can allow the distributor to shift and alter ignition timing. The adjustable collar eliminates this by securing the housing in a precise, fixed position once timing is confirmed. For the $35 premium over JM7715, the collar provides meaningful timing stability on high-performance street builds and track-day vehicles where timing security matters.
Distributor rotation is clockwise — standard for the Chevy SBC and BBC. An external ignition coil rated at 35,000 volts or higher is required — the coil is not included. No external ignition control box is needed — the ignition module is integrated internally.
Three advance bushings and four advance springs are included for mechanical advance curve tuning. A vacuum advance block-off plate is included for performance builds where vacuum advance is not needed. A tachometer output extension cable, power extension cable, and color-matched spark plug wire retainer with screws are also included.
Adjustable Collar vs. Standard Hold-Down — What It Actually Does
On a standard distributor without a collar, timing is set by rotating the distributor housing and then tightening a single hold-down clamp bolt against the outside of the housing. This works adequately on most street applications, but the clamping force is indirect — the bolt presses against one side of the housing and relies on friction to hold position. Under sustained high-RPM operation and engine vibration, this friction can be overcome and the distributor can rotate slightly, shifting ignition timing from where it was set.
The adjustable collar on this distributor solves this directly. The collar is a precision ring that wraps around the distributor housing body and clamps with even, circumferential force — locking the distributor in the exact position where timing was confirmed. The collar can be loosened for adjustment, the distributor rotated to the correct position, and then the collar re-tightened to lock timing precisely in place. This provides a significantly more secure hold than a standard clamp, particularly under high-RPM and high-vibration conditions.
Pro Series R2R vs. Pro Series R2R with Collar — The $35 Decision
The standard Pro Series Ready-to-Run (JM7715) and this collar version (JM7716) are otherwise identical — same integrated module, same advance kit, same advance block-off plate, same tachometer output, same external coil requirement, same engine fitment. The $35 premium is entirely for the adjustable collar. If timing security under high-RPM conditions is a concern in your build, this is a straightforward upgrade. If a standard hold-down is acceptable for your application, JM7715 is the correct unit.
Performance Benefit
The integrated circuit board module and magnetic pickup deliver precise, repeatable spark timing without the wear and drift of points-based systems. Three advance bushings and four advance springs allow the mechanical advance curve to be matched precisely to your engine's camshaft, compression ratio, and carburetor calibration. A vacuum advance block-off plate is included for builds preferring full mechanical advance only. A tachometer output extension cable simplifies aftermarket tach wiring without adapters.
COMPATIBLE WITH
CHEVROLET SMALL BLOCK V8 GEN. I
• 4.3 L / 262 in³
• 4.3 L / 265 in³
• 4.4 L / 267 in³
• 4.6 L / 283 in³
• 4.9 L / 302 in³
• 5.0 L / 305 in³
• 5.0 L / 307 in³
• 5.4 L / 327 in³
• 5.7 L / 350 in³
• 6.6 L / 400 in³
CHEVROLET BIG BLOCK V8 GEN. II (MARK IV) — STANDARD DECK ONLY
• 6.5 L / 396 in³
• 6.6 L / 402 in³
• 7.0 L / 427 in³
• 7.4 L / 454 in³
NOTES
• Fits Chevrolet Gen. I small block and Gen. II (Mark IV) standard deck big block V8 engines.
• Adjustable slip collar allows proper distributor depth setup without rotating engine to TDC.
• Ready-to-run design — internal ignition module eliminates the need for an external ignition box.
• Not compatible with tall deck big block engines (366ci, tall deck 427ci truck engines).
• Not compatible with LS or Gen V LT engine platforms.
• 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 Camaro (1967–1981)
Chevrolet Chevelle / Malibu / El Camino (1964–1977)
Chevrolet Nova (1966–1979)
Chevrolet Impala / Bel Air / Biscayne (1955–1976)
Chevrolet Corvette (1955–1982)
Chevrolet Monte Carlo (1970–1977)
Chevrolet C/K Trucks (1955–1987)
GMC C/K Trucks (1955–1987)
SPECIFICATIONS
Trigger Style: Circuit Board Module with Magnetic Pick-up
Distributor Rotation: Clockwise
Advance Type: Mechanical and Vacuum
Cap Style: Male
Mechanical Tach Drive: No
Slip Collar: Adjustable
Coil Included: No
Coil Type: External
Required Coil Output: 35,000+ Volts
Required Electrical Set-up: 12 Volt with Alternator
Gear Material: Steel
Housing Material: Machined Aluminum
Ignition Box Required: No
Marine Use: No
Cylinders: 8
Included: 3 Bushings and 4 Springs for Mechanical Advance
Color-Matched Spark Plug Wire Retainer with Screws
Vacuum Advance Block-off Plate (Black)
Power Extension Cable
Tachometer Output Extension Cable
