Regardless that the Blacktop head incorporates a more open combustion chamber (see “Head combustion- chambers”) it still has an increased static compression ratio (see “compression ratio”), this is purely as a result of piston style. The Silvertop piston contains a extremely smaller dome with two deeply angled exhaust flycuts, two https://4age-blacktop-for-sale59158.blogginaway.com/31931017/what-does-blacktop-20v-4age-mean