Products

SELECTIONS: Products : Marine/Towing/RV/Off-Road : Holley 4BBL : 4781 - 4150 (850CFM)
Mechanical Secondary 4BBL


Part Number:
44781S3

Product Name:
Holley 4BBL Mechanical Secondary 850CFM

Description:
SMI - STAGE THREE - 4781 (850CFM) 4150 HOLLEY FOUR BARREL:

Our Price: $895.00

Features

  • Venturi size is increased to provided maximum airflow capacity to match the needs of your engine to produce maximum possible torque and horsepower. All casting flaws are removed and venturis are finely polished to eliminate power-robbing turbulence
  • Metering block design is selected based on your engine combination
  • Matched boosters are installed, then aligned and centered in the venturi for best flow and signal
  • Floats are modified based on applications, drag float, single taper, double taper
  • Choke tower is removed with Bridgeport vertical milling machine to increase air flow, and balance air flow of primary and secondary venturis. This promotes increased high rpm horsepower. This is a no cost option however an optional electric choke can be
  • Carburetor is assembled using only the highest quality components, including reusable gaskets for ease of tuning and service
  • Booster design is chosen based on your engine specifications, then balanced and modified for increased signal strength and atomization characteristics, providing crisper throttle response and driveability, as well as increased HP and TQ thru-out the rpm
  • All components are then vibratory tumble polished and dichromate coated for a brilliant high gloss gold finish
  • Metering blocks are hand selected and all circuits and passages are checked for casting flaws and obstructions, as well as proper sizing
  • Throttle shaft thinned to reduce area and increase peak airflow capacity, stainless button head screws used to secure throttle blades
  • All body surfaces machined for maximum gasket sealing, ensuring consistency and reliability
  • Balance all metering passages, then resize and modify for optimum fuel curve, including:
  • Emulsion, High Speed Air Bleed, Idle, Idle Air Bleed, Main Well, Main Well Exit, Power Valve, Transition


Quantity: