While the Blacktop head includes a additional open up combustion chamber (see “Head combustion- chambers”) it nevertheless has the next static compression ratio (see “compression ratio”), this is purely due to the piston style and design. The Silvertop piston incorporates a incredibly compact dome with two deeply angled exhaust flycuts, https://brooksacbba.blog-gold.com/38922576/little-known-facts-about-4age-20v-itb