Ok I am building a turbo z6 (9 psi tb22, e85, stock rods) and I have a couple of pistons to chose from I have.

p28
pm6
pm7

I was wondering what one is practical? Also the valve relive cuts are different in the pm6 and 7. Will thy even work in a z6? I am also running into a problem with crank walk spec is 18 max I am at 25? New thrusts 2 block and 2 cranks now all the same 25-26.

 

if I were you I would also upgrade the rods even at 9 psi, once you feel boost then eventually you'll want more. Or at least put some ls rods in it. pistons wise I would go with the p28, pm6 and pm7 would raise the compression in your motor. I think the p28's in the z6 block with head has like a 9.2:1 or 9.5:1 which is good for boost

 

seems as though you are on a budget?? maybe I am wrong?

if you are, check this out..

http://fjdistributors.com/product_in...roducts_id=285

fj's are proven, are great bang for the buck, and will be able to take some more punishment when you get the itch for more

 

go vitara if you want to boost high. that and some decent rods, perhaps even shotpeened y8 rods..

 

Well the JE/Weisco/SRP are forged aluminum where as the vitara’s are cast aluminum, forged is much stronger. We use vitara’s bacause

* yes it lowers C/R to a much more boost friendly level, although 9:1 will be the lowest I go from now on.

* the ringlands are (supposedly) thicker than the factory honda pistons, ringlands are usually the first thing on the pistons to break with the stockers.

* they’re cheap and they fit.

http://vitarapistons.com/400-hp-vitara-question/