Holley Carburetor Fastener Torque Specifications

Recommended Torque Range for Specific Holley Carburetor Fasteners

Fastener Size
Threads Per Inch (TPI)

Application

Torque Range
Minimum–Maximum
Inch-Pounds (dry)

12–24 Bowl Screws 25–30
1/4–32 Main Jets 30–40
1/4–32 Adjustable Needle-and-Seat Lock Screws 50–60
5/16–24 Carburetor to Manifold Attaching Screws 60–80
5/16–24 Internally Adjustable Needles-and-Seat 60-80
7/16–24 Internally Adjustable Needles-and-Seat 70–90
1/2–28 Power Valves with Multiple Drilled Holes 40–50
1/2–28 Power Valves with Large Window Openings 100
9/16–24 Fuel Bowl Inlet Fitting 175–200
7/8–20 Fuel Bowl Inlet Fitting 200–250
Plugs
1/16–NPT 1/16–Inch Pipe Plug 50–60
1/8–NPT 1/8–Inch Pipe Plug 100–150
1/4–NPT 1/4–Inch Pipe Plug 160–240

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