We made a backing plate that perfectly mounts up for the Silvertop and Blacktop 4AG and will allow the... Despite the fact that the Blacktop head contains a additional open combustion chamber (see “Head combustion- chambers”) it however has a better static compression ratio (see “compression ratio”), this is purely https://raymondkubcd.glifeblog.com/38454382/indicators-on-4age-20v-blacktop-for-sale-you-should-know