Despite the fact that the Blacktop head contains a far more open up combustion chamber (see “Head combustion- chambers”) it however has a better static compression ratio (see “compression ratio”), this is solely due to piston layout. The Silvertop piston encompasses a extremely modest dome with two deeply angled exhaust https://4age20vblacktop03887.tinyblogging.com/what-does-blacktop-20v-4age-mean-75078067