Despite the fact that the Blacktop head features a more open combustion chamber (see “Head combustion- chambers”) it continue to has a higher static compression ratio (see “compression ratio”), this is solely due to piston layout. The Silvertop piston encompasses a quite smaller dome with two deeply angled exhaust flycuts, https://4age-20v-blacktop-for-sal37046.ka-blogs.com/84705782/toyota-4age-engine-for-sale-an-overview