1.48485. Not entirely ideal, but with a 1.050 compression height, and a thick dome, they're plenty strong. I dont think I'd like to use a flat top or dish piston/boost with this stroke, there isnt enough material there above the ringlands. Some nifty coatings on skirt/face help as well. The motor spins (and makes power) happily to 7400, and thats about all your can ask with that much piston speed.

It's a lightened K1 crank, little nicer then a callies compstar.