The best stroker 408-416-426-435 combination in stock 68 340 block

Famous Bob, comparing sb 408 to bb408, even if you had similar head flow, the Bb will have less valve shrouding, MUCH less ring drag, which by the way at one time (5/16rings?) Was 50 percent of rotating friction. It would be interesting to have a dyno comparison, but the logistics of making it an equal test would make it almost impossible.