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Time: approximately 30 minutes Tools: small Phillips screwdriver Here’s what you’ll need: Holley quick-change spring housing, vacuum secondary spring kit Tip: During the test and tune process, keep track of which springs help or hinder your carburetor’s performance. They make it easy by color-coding the top of each spring. Here’s what you’ll net: ability to change and custom tailor your secondary fuel delivery in a matter of seconds. Click Here For This Month’s Tech Article You Will Need Adobe Acrobat Reader to View this PDF