Even though the Blacktop head incorporates a a lot more open combustion chamber (see “Head combustion- chambers”) it nevertheless has a better static compression ratio (see “compression ratio”), this is purely due to the piston design. The Silvertop piston includes a quite little dome with two deeply angled exhaust flycuts, https://danteuaeff.blogdiloz.com/30604570/5-essential-elements-for-4age-blacktop-for-sale