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2001-2006 Chevrolet Silverado 1500 HD
NOTE: "HN" series are only available as rod bearings and are engineered to provide increased crankshaft fillet clearance
accelerator pump spring
Individual cap may be purchased separately when using an existing pump
AVS IISince 1938
Moroso Adjustable Vacuum Advance Kit - 1975-+81 GM HEI Distributors 4704323-20- L 2001-2006 Chevrolet Silverado 1500 HDAllows you to change the amount of ignition vacuum advance for maximum part throttle performance while preventing the harmful effects of spark knock (detonation) Dial in as much spark advance as conditions permit add more advance under light load conditions to improve throttle response and fuel economy, or limit spark advance in high compression engines and high load conditions to eliminate knock Built in stop prevents the adjustment screw from
