The Blacktop has an inside shape of your manifold in a far more of a heart shape than the Silvertop’s circular inlets (see “Throttles”). The Blacktop inlets at the head side can also be broader to permit with the bigger inlet ports in The pinnacle. Be sure to see “Throttles”, https://4age20vitbs94815.onesmablog.com/little-known-facts-about-4age-engine-for-sale-75263992