In case anyone is interested, here are the engine weights for Mopar engine from the 60s/70s. As expected, the 426 Hemi weighs the most at 765 lbs. As a comparison, here is what our modern Hemi's weigh: 6.4L Total Weight, Full Dress 582 lbs. Engine weight 500 lbs. - dry weight 5.7L Total Weight, Full Dress 591 lbs. Engine Weight 5.7L Iron Block, 2009 560 lbs. 6.1L Total Weight, Full Dress 578 lbs. And here is the weight for the V6 3.6 Pentastar: 330 lbs. (lightest of them all)