The left flywheel pictured is the sooner Silvertop structure while the right could be the lightened Blacktop. Even though the Blacktop head contains a much more open combustion chamber (see “Head combustion- chambers”) it nevertheless has the next static compression ratio (see “compression ratio”), this is purely due to the https://4age-blacktop-engine-for82467.activablog.com/38831877/an-unbiased-view-of-4age-20v-blacktop