I won't know for sure until I get my block back from have the valley modified for the roller lifters however, a quick calculation yeilds approx 1.340" CD which may just miss the oil ring groove anyway.

So if the difference in using the 6.250" rods compared to the 6.125" is negligable, may as well stick with the 6.250" as the pistons will be little lighter too??

Will the 1.340" CD piston still be as durable for street applications as lets say, the 1.460" CD piston with the 6.125" rod?