Nothing wrong with the 346, Richard Petty once said that his favorite head was the 346. I don't like the 902 simply because I've found them cracked more than the others in their stock state. Now I don't have a preference between the 346 and the 452, to me they are about the same and we've never pushed them beyond 680 HP. However, the 906 is my favorite of the factory iron, yet we've never been able to get more than 748 HP out of them. Maybe could have, but when the dyno operator forgot to turn the water on to the engine that day, well, that kinda squelched any real power tests.
