The Edelbrock #19014 AV2 Series EnduraShine 500 cfm Carburetor is designed and calibrated for small cubic-inch single carb applications, match with an Edelbrock Performer or Performer EPS manifold or other brands of similar design. Includes both timed and full vacuum ports for ignition advance. #19014 is calibrated for single-quad applications and factory equipped with: Metering Jets - Primary .095, Secondary .095, Primary Rod .070 x .052, orange spring (5' Hg). Use carb Studs #8008 or #8024 if needed. Match with an Edelbrock intake manifold for the ultimate induction upgrade.