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Piston Basics Po Up Pistons

 
Piston Basics Po Up Pistons
Piston Basics Po Up Pistons
We used to call these "pop-up" pistons, with a crown that fit the combustion chamber perfectly. In the days of high-octane fuel, pop-ups and a 13.0:1 compression were the norm. The pop-up crown fills the chamber and raises compression dramatically. We don't see these much in street use today. View Related Article
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