FULL RESULTS, 400 SBC, LOTS OF BOOST 8-71 & 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 ratio-is it important? What did the Hi-Performance 302, 327 and 350s have that the 400 did not? Check these 400 builds as we add boost first from an 8-71 then from a Vortech YS-I supercharger. 1000-hp never sounded so good!