We created a backing plate that completely mounts up on the Silvertop and Blacktop 4AG and enables the... Although the Blacktop head contains a far more open combustion chamber (see “Head combustion- chambers”) it however has a better static compression ratio (see “compression ratio”), this is purely as a result https://jdmtoyota4a-ge67901.blogginaway.com/40481214/5-essential-elements-for-4age-engine-for-sale