Chevytu,
hi! the 250 had a bore of 3.875" and stroke of 3.530". nice to see you're into the sixes. little warning though, they're not cheap. if you're gonna build for power and rpm, you may want to stick with the 283. its capable of turning higher rpm with less modification than the 6 and ya have a few more options for performance parts than with the 6. whatever you choose, good luck!
