Regardless that the Blacktop head incorporates a extra open combustion chamber (see “Head combustion- chambers”) it even now has a higher static compression ratio (see “compression ratio”), this is purely as a result of piston design. The Silvertop piston incorporates a very smaller dome with two deeply angled exhaust flycuts, https://toyota4age79169.bcbloggers.com/30735023/details-fiction-and-toyota-4age-blacktop-engine-for-sale