Though the Blacktop head includes a far more open up combustion chamber (see “Head combustion- chambers”) it still has a greater static compression ratio (see “compression ratio”), this is solely due to piston style and design. The Silvertop piston features a incredibly modest dome with two deeply angled exhaust flycuts, https://toyota4ageblacktopenginef26800.bluxeblog.com/60976554/helping-the-others-realize-the-advantages-of-toyota-4age-engine-for-sale