Even though the Blacktop head contains a much more open combustion chamber (see “Head combustion- chambers”) it even now has a greater static compression ratio (see “compression ratio”), this is purely due to the piston structure. The Silvertop piston features a incredibly little dome with two deeply angled exhaust flycuts, https://judahddacn.blog5.net/74105161/details-fiction-and-toyota-4age-blacktop-engine-for-sale