Though the Blacktop head features a more open combustion chamber (see “Head combustion- chambers”) it continue to has a better static compression ratio (see “compression ratio”), this is only because of the piston style and design. The Silvertop piston includes a pretty small dome with two deeply angled exhaust flycuts, https://brooksonmjh.ezblogz.com/60559164/the-greatest-guide-to-4age-engine-sale