We designed a backing plate that completely mounts up for the Silvertop and Blacktop 4AG and allows the... Although the Blacktop head includes a more open up combustion chamber (see “Head combustion- chambers”) it however has a higher static compression ratio (see “compression ratio”), this is only as a result https://toyota4ageblacktopenginef79012.myparisblog.com/40309450/details-fiction-and-blacktop-4age