440 source???

why? because the 440 is a weak block with ,375 to max .575 main shell webbing.If I were to build a 543 using a standard 440 block I would hard block the water passages as the 440s have long tubes and are known for wrinkling the walls over 650 hp.I would reccomend studs and billet caps which requires line boring.a girdle,and a lot of extra bucks on machine work. that takes the fun out of it as with the hard block its race only.unless its race only why bother spending the money as ya can build a 600 hp 440 engine using the factory internals as long as everythings been miked out and magnafluxed and have a good street engine. I would save the money for a rainy day on the 543 build and just build a standard stroke 440 for the street. the 400 is a different story, especially the 1.350 main saddle block but its easy to get 550 600 horse out of a 400 also using standard stroke and have a much stronger block than a 440 but to each their own. sounds like an advertisement for 440 source leaving a lot of things out that are required on the 440 using their 543 440 stroker kit. I understand cycle life but magnafluxing isnt expensive.be it torque or hp that 440 block will need the above mentioned items to work,you can skip the hardblock and run it on the street but torque breaks parts faster than hp.balanced to within what? a decent machine shop can balance to within 1/2 gram. never assume until you check first.good luck standard stroke 440 with factory crank and eagle rods with the right combo can be streetable and run in the 9s with main and head studs and a decent set of aftermarket heads. thats my opinion