Weights . . .
What a cool little link! I'd love to know where they got their figures. Looks like the slant 6 weighs a bit less than the Chevy 250 but more than the Falcon 170, which was a commendably light engine although not as suited for heavy duty applications as the slant six. The 273 is similar in that it's lighter than the Chevy small block but heavier than the Ford 289/302, which shared the lightweight cast iron technology of the Falcon 6. Nothing lightweight about the big Ford V8s, like the 390 in the Thunderbird above; that's one heavy chunk of cast iron! Durable though. And nobody was brave enough to list a weight for the old Jaguar XK engine, that six weighs more than most V8s even with its' aluminum head.
The heaviest engine listed is the Pierce-Arrow V12. Believe it or not, I saw one on the 405 in north Orange County exactly one week ago today. I was surprised to see a prewar car in the right lane about 11:00 in the morning and pulled alongside for a better look, only to spot the trademark Pierce-Arrow headlamps on the fenders. I pulled up a bit and checked out the grille in my right hand mirror, sure enough a Pierce-Arrow grille, then dropped back next to it and saw the "V-12" emblems. It was a gorgeous roadster with the top up, doing about 65 mph with no noise or smoke, an amazing sight for a car that was about 75 years old. Made my day for sure!