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The Edelbrock single‑stage 8.5 in Hg power valve is a vacuum‑sensing unit that opens at higher vacuum thresholds to add fuel under heavy load and prevent bogging. Its 8.5 in Hg rating suits certain low‑vacuum or tuned applications requiring late opening for enrichment. Use the valve as a service replacement to match engine vacuum behavior and maintain smooth power delivery when under load.
Edelbrock Single-Stage Power Valve Standard Flow 8 5 In Hg
