Regardless that the Blacktop head includes a a lot more open up combustion chamber (see “Head combustion- chambers”) it still has a greater static compression ratio (see “compression ratio”), this is purely due to the piston style. The Silvertop piston contains a quite small dome with two deeply angled exhaust https://4ageengineforsale61581.popup-blog.com/30709306/a-review-of-4age-blacktop-engine-for-sale