[slyw/fbpsi]

The d15b vtec uses the same pistons as a d16z6, so you get to use anyone you want from a manufacturer that has it for the d16z6, for rods you have to get custom ones made, no problem since it's only like a $100 dollars more. The d15b vtec has the same 137mm rod length as the d16z6 but has the bearing size of any d15, I am going with cp/pauter, pistons/rod setup in my d15b vtec. If you are going to get your block sleeved, you could buy another spare d15b vtec and send that off, and have the builder look at the rods in there, so he has a better understanding of the specs to get some ordered, or you could go to like exospeed and use their d16z6 and just pay the $250 core charge. That would eleviate you having to buy the d15b vtec block, pay for shipping to get it, as well as ship it to the engine builder, if you don't want the down time.