I have a d16y8 motor and i noticed 1 side has bigger grooves than the other. These are 9.0.1 pistons 76mm. I didnt no which way the pistons face. Do the big grooves sit in the back facing the oil filter and the smaller grooves sit facing the turbo manifold?
Like this:


im goign to pick up my block today and they r gonna put the pistons and rods together for me but i need to no which way the pistons sit.

im pretty sure thats the way ive seen them on most motor setups but not sure sure and im always getting mixed peopel telling me this and that way. thanks for the help

 

The bigger valve reliefs are the intake side. You have it right!

 

One other thing to remember is that the bearing tangs go towards the exhaust side of the engine when you put the pistons on the rods. Best to check this now before the engine is assembled!!