Holley 5.5 Power Valve Single-Stage Standard Flow
The Holley Single-Stage Power Valve is an important component in the power enrichment circuit of Holley’s performance carburetors. This power valve operates by using engine vacuum to control its opening and closing rate.
Key Features
- Opening Vacuum: 5.5 in. Hg
- Type: Single-stage standard flow design
- Includes: Gasket for installation
- Operation: Opens to supply additional fuel to the main system during heavy load or full power situations
Function
When the power valve opens, additional fuel is supplied to the main system during heavy load or under full power situations to eliminate hesitation and bogging—ensuring the smooth delivery of power without any drivability concerns. The valve operates automatically based on engine vacuum levels.
Compatibility
Designed for use with Holley performance carburetors as a replacement power valve component. Available in many different vacuum ranges to time the system’s operation to specific requirements.
Modern Protection
Holley performance carburetors built since 1992 utilize a power valve check system that effectively protects against damage from engine backfire. This check ball system is 100 percent effective in protecting the power valve diaphragm from damage due to engine backfire.