I'm pulling my numbers from here:The 7.3 is lighter than a 5.8. To many variables looking at curb weight. Frame of truck, different options, 4x4 , wheels tires.
The 7.3 has a wider bore spacing and taller deck than a small block, but not quite the size of a traditional big block. It's more of a "medium" block. Definitely not a small block.The 7.3 is a small block with a big bore and a taller deck. Remember most of the 7.3 other than the block is mainly aluminum and plastic.
Marcus Luttrell has a saying that we use around the shop:I would do a 514 big block... 😇
John MihovitzWell I guess some people have zero experience in push rod motors. That 7.3 has the potential of making some serious torque with the right parts. Main bearing journals are a perfect recipe to put the hurt on a modular motor. As even the coyote reach its limits that's why ford racing came out with an iron block for serious hp levels. That engine doesn't weigh what you think. My 351c kills the 2020 gt500 bottom and top end. 351w has large main journals no matter what power adder you put 3 inch mains blow apart past 6500 rpms. I can push my Cleveland as hard as a modular motor. Having a 4.30 or 4.56 gear has it's toll at the end of the quarter mile. That is where the 351w is limited. I wouldn't waste money building a 351w just a time bomb ready to explode. The 7.3 has all the the right measurements to be a sledge hammer at the 1320's. Plus the fox boy is way lighter than the new Mustangs. But hey what do I know I build engines for a living and own the company. See you at the track.