That reply is the most vague, nonsensical piece of drivel I have read for a while. We should be comparing engines in stock form. The 340, hands down is the best and sweetest SB (chev terminology - lets say LA engine) in the world. Most people should know that Chrysler generally underrated their factory performance figures. The 426H was rated at 425HP but most people who have been around them for a while knew that the actual figure was closer to 470-500hp. The same went for the big valve 340 (2.02 X head). Rated at 275 hp, they have been proven many times to deliver over 300HP in stock form. In fact, I think it was one of the mags, possibly HotRod Magazine that decided to put that to the test. They built two 340 engines to stock specifications as far as possible (using stock components). One engine dyno'ed at 315 hp, the other went to almost 323hp! Quite impressive.