Lionel Butler, Jeff Merritt, Jeff Sims, Bernardo Mercado, Jeremy Williams, come to mind instantly. Are you on about obscure Heavyweights that aren't mentioned regarding their power ? Or notable Heavyweights that aren't credited enough for their power ?
Floyd Patterson. Herbie Hide. Two lighter fighters who really punch . Hide was a poor finisher but hard hitting
Hide was lighting him up un the first round until his corner told him to start using the jab and box tall. Second round was like some sort of switch had been flipped.