HP Main Body Retro Fit Kit

HP Main Body Retro Fit Kit For Holley Double Pumper® Carburetors

PART# 134-300S

Suggested Retail: $163.95
Your Price:$146.95
Free Shipping on orders over $100*


This retrofit main body kit converts 0-4777S (650 CFM), 0-4778S (700 CFM), and 0-4779S (750 CFM) carburetors to a 750 CFM HP main body for increased horsepower, torque & airflow.


  • All Necessary Parts Are Included
  • Simple Installation With Common Hand Tools
  • Pre-Calibrated At The Factory For Optimum Performance and Drivability on a Wide Variety of Applications
  • Reduces Turbulence And Smoothes Air Entry Into The Venturi
  • Eliminates Choke Tower and Associated Hardware of Standard Holley Double Pumper®
  • Eligible For Holley Contingency Programs


Product TypeCarburetor Part
WarningCalifornia Proposition 65

Tech Resources

WARNING FOR 134-300S: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
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