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Holley

HOLLEY Power Valve

MPN: 125-135 Catalog #: 001508958 Category: Carburetor Power Valves And Components Check Vehicle Fitment

Product Details

Power Valve - High Flow - Single Stage - 3.5 in Vacuum - Gasket - Each

Single-Stage Power Valve; High Flow; 3.5 in. Hg.;

There still seems to be a lot of misconception about Holley carburetors blowing power valves. Nothing could be further from the truth. Holley performance carburetors built since 1992 have utilized a power valve check system that effectively eliminated this infrequent problem. Consisting of a spring, brass seat and check ball, the check ball system is 100 percent effective protecting the power valve diaphragm from damage due to engine backfire.The power valve check ball is designed to be normally open but quickly seals to close off the internal vacuum passage when a backfire occurs. Once closed, the check valve interrupts the pressure wave generated by the backfire, thus protecting the power valve diaphragm. There is no way that the power valves diaphragm can rupture due to an engine backfire!

Fitment: Single-Stage Power Valve High Flow 3.5 in. Hg

DETAILS:

Part Number 125-135 SPECS:

Power Valve - High Flow - Two Door - Single Stage - 3.5 in Vacuum - Gasket - Each

DETAILS:

  • Holley Performance Emission Code 5: This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled (Non-Emissions Controlled) Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
  • Carburetor Power Valve
  • Single-Stage Power Valve
  • Includes Gasket
  • Opening Vacuum 3.5 in. Hg
  • POWER VALVE
  • Power Valve

Part Number 125-135 SPECS:

  • WARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
  • WARNING CA Proposition 65: Yes

Power Valve - High Flow - Two Door - Single Stage - 3.5 in Vacuum - Gasket - Each

Vehicle Fitment

Universal or product-specific fitment. Please review the product details and contact us if you need help confirming fitment before ordering.

Product Specs

Brand
Holley
Part Number
125-135
Catalog Number
001508958
Product Line
Carburetor Power Valves and Components
Category
Fuel Delivery
Type
Carburetor Power Valves And Components
UPC / Barcode
090127122235
Length
4.95 in
Width
3.50 in
Height
1.15 in
Weight
0.07 lb
Ship Alone
No
Air Restricted
No

Shipping & Availability

Current status 14 Available - Ready to ship
Estimated timing Usually ships within 24hrs

This item is showing available inventory. Most in-stock performance parts ship quickly, but timing can vary by warehouse, vendor cut-off time, holidays, and carrier pickup.

Inventory shown: 14 available as of 6/3/2026.

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