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1977-1977 Ford F-250
1999-2001 GMC Sierra 2500
Do not use rotator type valve springs or retainers for this application
alone or with belt-driven fuel pumps
Holley Single Stage 185 Power Valve - High Flow Control Arm Shims 1977-1977 Ford F-250Single Stage Power Valves High Flow #HLY125 125 Opening Vacuum 2. 5" Hg #HLY125 135 Opening Vacuum 3. 5" Hg #HLY125 145 Opening Vacuum 4. 5" Hg #HLY125 155 Opening Vacuum 5. 5" Hg #HLY125 165 Opening Vacuum 6. 5" Hg #HLY125 185 Opening Vacuum 8. 5" Hg #HLY125 1005 Opening Vacuum 10. 5" Hg Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA Pro Stock champion
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