Most physically powerful boxer...

Jefferies,Tom Sharkey,Chuvalo,Foreman,Marciano

 

George Foreman. He was the strongest boxer I've ever seen.

 

Foreman was the strongest.

Power is mass x speed x strength. That would be Tyson, in my opinion.

 

George Chuvalo is a good choice, if we're talking raw physical strength.
He seemed to have Foreman aware of his strength when they fought back in 1970.

 

James J. Jeffries Without A Doubt

 

Foreman had the most serviceable physical strength of anybody I watched box. Liston could have neutralized Foreman's superior strength with his long ramrod jab, and lower center of gravity, keeping George far enough away so he wouldn't be able to muscle Sonny around.

Among heavyweights, John Tate is overlooked in this department, but he physically smothered and manhandled Mike Weaver for 13 of 15 rounds, and only lost because of extremely bad corner advice to voluntarily retreat in the fatal round 15.

Among middleweights, Mustafa Hamsho comes to mind. He was able to stand his ground with Minter, and although badly outpunched by Hagler, he wasn't outmuscled by Marv. Immediately after Hamsho handed Bobby Czyz his first defeat, Czyz pinpointed Hamsho's superior physical strength as the specific reason for that bout's outcome, a remarkable admission by somebody who prided himself on his own physique.

The two matches between Antuofermo and Minter largely hinged on who was able to utilize their physical strength more effectively. Vito shoved Minter to the deck late in their first encounter, by planting his right fist on Minter's torso and pushing Alan onto his back for an incorrectly referee ruled knockdown, with just that right arm.

In the London rematch, Minter returned the favor, tossing Vito about like a rag doll. As with Hamsho, Hagler outpunched Minter, but he didn't outmuscle him.

Dwight Davison's physical strength and ability to use it effectively (generated through his high school wrestling background), totally stymied the offense of the ultra-aggressive Curtis Parker, sending Parker to his first defeat. Although Davison was badly outworked by Tony Sibson, he was certainly not outmuscled by him.

Bonecrusher Smith similarly frustrated Tyson with his superior size and physical strength.

Lupe Pintor was a bantamweight tank. Jim Watt was slower than most lightweights, but could also outmuscle them. Arguello's superior boxing technique is what allowed him to negate Watt's considerable strength.

Victor Galindez was known for his physical strength, and was one of the very few champions of his era to lift weights.

Ali and Tunney were dedicated ax wielding woodchoppers, as was Paulino Uzcudun. Carnera/Uzcudun involved a lot of musclepower, as did Willard/Johnson, and Johnson/Jeffries. Max Baer outpunched Carnera badly, but I would have very definitely put my money on Primo in a wrestling match.

At his best, Dwight Qawi was as miserably difficult to back up as Liston. When very overweight and way past his best, Ike stood up to Foreman extremely well for six rounds, actually winning some of them. When Holyfield unified the CW Title against Qawi, it was Evander giving up ground, as Mike Spinks did when he unified the LH Championship against Ike. While Eddie Davis was the one continually coming forward against Spinks, he was either on the retreat against Qawi, or fighting him off the ropes as Dwight swamped him.

 

I just wish my enthusiasm, interest and curiousity measured up to yours. I'm no kind of expert, just someone reminiscing about a past he wasn't old enough to experience.

Check in with me in another 30 years, and I'll probably be commenting ignorantly on the current era I'm completely disinterested in at present. There are far more scholarly, knowledgable and engaged posters than myself here, but I'm having fun expressing what little I've deluded myself into believing I know. (Meanwhile, I've been contaminating the internet with my rambling drivel, and have discovered to my horror than I'm looking up my own posts for information. Scary realization! This is what happens when one has a ninth degree in BS.)

 

Primo Carnera was rediculously strong. Also, the Klitch boys are very, very strong.

I've heard that Ali was also super strong. He really never got man-handled, even in his rope-a-dope phase.

In the lesser weights, there are many to mention but Terry Norris comes to mind benching over 300 while weighing in at a super welter.

 

As was George Godfrey who, if memory serves, seemed to have had the overall advantage in matching strength in the clinches with Carnera, as he seemed to have pushed Carnera back on a number of occasions during that fight.