Holley Single Stage 65 Power Valve - Standard Flow Primer The #5900 Series valve springs

The #5900 Series valve springs are designed for use with OEM valve rotators

Titanium Nitride (TiN)

For either square- or spread-bore carbs

1973-1974 Pontiac Grand Am

Each style is specially designed for a perfect and custom fit and each style has it's own durometer

Holley Single Stage 65 Power Valve - Standard Flow Primer The #5900 Series valve springsSingle Stage Power Valves Standard Flow #HLY125 10 Opening Vacuum 1. 0" Hg #HLY125 25 Opening Vacuum 2. 5" Hg #HLY125 35 Opening Vacuum 3. 5" Hg #HLY125 45 Opening Vacuum 4. 5" Hg #HLY125 50 Opening Vacuum 5. 0" Hg #HLY125 65 Opening Vacuum 6. 5" Hg #HLY125 75 Opening Vacuum 7. 5" Hg #HLY125 85 Opening Vacuum 8. 5" Hg #HLY125 95 Opening Vacuum 9. 5" Hg #HLY125 105 Opening Vacuum 10. 5" Hg Holley has been the undisputed leader in fuel systems for over