Quadrajet Problem Solving > Quadrajet Parts and Numbers

Power Piston Spring ID

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Tuffnut:
I purchased a kit from Cliff's. My 350 is running 16-17" vacuum at idle. Which spring color should I start with?
I should use a spring half my vacuum? Which color would this spring be as no ID came with them.

Thanks

Jeff

Sonny:
This old post might have the details you need
https://cliffshighperformance.com/simplemachinesforum/index.php/topic,1248.msg5575.html#msg5575

Tuffnut:
Thanks Sonny, with 17" vacuum at idle and a heavy car 75 Supreme Cutlass with an 200R4 Over drive tranny with 3:42 gears, I would think I should be trying the 10" first. Always go back the 8" if needed.

Thoughts?

Jeff

tayto:
i have a black spring in my kit, is that the heaviest spring?

Cliff Ruggles:
No black spring in our kit, but there is a dark blue and it is the strongest spring in there.  I'd use the dark blue one for what you are doing......Cliff

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