Sportster Head Changes - Build-Off - Greg's Bike
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Revolution Performance makes beehive- shaped valve springs; they're called beehive springs because the top of the spring tapers in towards the valve stem and keeper. Each spring is rated for 180-pounds of pressure at .600 lift and Revolution claims that the springs enable higher revs, longer life, cooler-running, and make less noise than other "performance" springs. View Related Article
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