413 Big Block

case by case, I bet...I've seen that exact topic discussed on here with the search function. As I recall, there was no general consensus, there was no concrete answer other than a few folks who said they knew someone who'd done it, but unless you were the machinist or the guy building the engine, who knows? Only way to know for sure, sonic check the block in hand...but we all know that.

Pretty tempting to think you could make your own 426W, but the pistons for that app might as well be custom too...I can't say I've seen any part numbers that were off the shelf availability like a 440 or even a 383...unless you want to use 383 pistons, but they'd be like 0.180" in the hole.