I recently bought a block, pistons, and rods from a member here on HT. Everything he told me seems to be legit, but I have questions about the pistons.

The setup in the end will be a b18c1 head, this block that i'll list below, and a gt35 @ about 25 psi... hoping for 550 wheel horse.

Anyway the block is a Darton sleeved 85 mm b18a1. I got it, with Crower Billet steel LS Rods, and JE 85 mm pistons. The part # on the pistons is 185918 and the box says B16a3. I know the size is rigth on them, I just dont know if the rod length of the LS rods is right, and if they will work with the LS rods, LS crank, and b18c1 head?

Also, does anyone know, or know the formula to find out what the compression of these will be with a b18c1 head on the b18a block (9.0 advertised compression)

 

not sure about your other questions, but here is a compression calculator:
http://www.c-speedracing.com/h...c.php

 

If my calculations are right the comp ratio is like 9.3

anyone know for sure these are the right pistons for LS rods and an LS crank?