The Blacktop has an inside condition of your manifold in a more of the heart condition compared to the Silvertop’s round inlets (see “Throttles”). The Blacktop inlets at the head facet are also broader to permit with the larger inlet ports in The top. Please see “Throttles”, “Head (Inlet encounter)” https://4age-blacktop-for-sale02222.blogsidea.com/41086625/a-secret-weapon-for-toyota-4age-for-sale