Review on Holley 20-13 Secondary Diaphragm Spring ๐ง Kit: Maximum Performance Upgrade for Reliable Engine Efficiency by David Gibbs
All signs look like it is fake which is packaged and sold as is.
Not available in retail packaging. The connection to the included spring is non-holly and provides reverse rev range opening and full opening. Does not include Holley instructions. I don't think this is a real Holly set. All the characters look like it's a fake packaged and sold as a holly. The feathers themselves look good. Time will tell if the quality is right.
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