Even though the Blacktop head contains a a lot more open up combustion chamber (see “Head combustion- chambers”) it however has a greater static compression ratio (see “compression ratio”), this is only due to piston style. The Silvertop piston features a quite compact dome with two deeply angled exhaust flycuts, https://johnathanmwbeh.blogs-service.com/62364215/helping-the-others-realize-the-advantages-of-4age-engine-sale