The Blacktop has an interior form of the manifold in a far more of a heart condition than the Silvertop’s circular inlets (see “Throttles”). The Blacktop inlets at The pinnacle side are wider to permit for the much larger inlet ports in the head. You should see “Throttles”, “Head (Inlet https://4age20vitbs47147.blogolize.com/about-4age-blacktop-for-sale-73634638