BoneSS

iTrader: (9)

Like the subject says, how much boost can you run by lowering the compression w/ the 6.0L heads?

LSs1Power

iTrader: (5)

Its not a matter of C/R only.... I would say its more of a cylinder pressure that concern me with the stock pistons. I know that there are some people out there pushed 14psi from a turbo setup and 15psi from a SC setup on a stock motor, but i would really have 4 grand handy because u might need it really soon. I wouldnt run more than 10psi if u want the motor to last for a while. Im running 8psi because i road course too which is alot of constant abuse.

smokinHawk

iTrader: (48)

enough to justify the purchase, they do flow well, i had lower CR pistons put in as well so i realy cant tell you exactly how much and ofcoarse it varies from setup

Got Me SOM

iTrader: (2)

I believe and this is dependent on headgasket thickness as well, they'll drop you to 9.5:1 , just cause the compression is lowered doesn't guarantee a better safety margin. You are still running a cast piston and that's your weak link right there, the ringlands can't hold the boost.

i speak from experience unfortunately. saving up for a forged block now.

BoneSS

iTrader: (9)

Is it really worth it to go w/ a new forged 346 or maybe iron block from the beginning and selling the existing engine inorder to make some money off the engine before something bad can happen? I have been hesitant to go that route b/c the car only has 29k on it, but I would hate to run that risk.

LSs1Power

iTrader: (5)

The stock aluminum block will do fine with boost. Just get forged pistons, rods with ARP main studs and head studs. Later on get 6.0 heads if u want. Make sure u have a C/R between 8.5-9.1C/R as the highest so u can run between 15-17psi safely. Good luck.