NOS GM Vacuum Advance Unit – 1973421 / D1307A – 1969–70 Chevy 350 V8

Description:

🔧 Part Overview: GM 1973421 Vacuum Advance

• OEM Manufacturer: Delco Remy

• Alternate Part Number: D1307A

• Type: Distributor vacuum advance unit

• Application: High-performance 350 CID V8 engines

🚗 Specific Fitment

This unit was originally spec’d for:

• 1969–1970 Chevrolet models with:

  • 350 cubic inch V8

  • 2-barrel carburetor setups

  • High-performance ignition systems

Likely candidates include:

• Chevy Nova SS

• Camaro (non-Z/28)

• Chevelle Malibu

• Impala with performance packages

🔁 Cross-Reference & Interchange

• Delco Remy D1307A — direct interchange

• NORS replacements available under various aftermarket brands

• Compatible with distributors like 1112008, 1112009, and similar-era Delco units