How do I identify what springs are in my vacuum pods? The six pack tune says black springs , mine are silver. Holleys website, they're all silver. Had these carbs gone through by a supposed expert, will not mention his name ( I should) and was quite disappointed when I received my damaged carbs delivered by UPS. Not insured for their amount. Wasted alot of money. So I have corrected the damage and am now going back through them. I also stroked my 340 to 418. So my goal was to check for correct springs, check initial jetting, power valve, and initial setting of idle adj. screws, before I move on to the rest of the list before start up.