FULL RESULTS, 400 SBC, LOTS OF BOOST 871 & VORTECH BLOWERS. Why is the big 400 The Other Small Block? It never got any performance, because GM never gave it the goods! What about rod ratiois it important? What did the HiPerformance 302, 327 and 350s have that the 400 did not? Check these 400 builds as we add boost first from an 871 then from a Vortech YSI supercharger. 1000hp never sounded so good!