Regardless that the Blacktop head includes a additional open up combustion chamber (see “Head combustion- chambers”) it still has a higher static compression ratio (see “compression ratio”), this is purely due to the piston style and design. The Silvertop piston includes a pretty smaller dome with two deeply angled exhaust https://blacktop20v4age07047.answerblogs.com/31526268/4age-blacktop-engine-for-sale-can-be-fun-for-anyone