I received a replacement for a blown up LQ4 I purchased.
The yard unknowingly gave me a 03 LQ9 with gen 4 rods and flat tops.

I was planning on using the stock rods/pistons, ZL1 heads, and a ZL1 blower (have blower)

But that would put me at 10.2:1 compression and I only have access to 92 octain.

Can get away with 10.2:1 or do I need to use a dished piston to achieve a more OEM 9:1 CR?

 

You will be fine with that compression. There are plenty of people boosting stock LS2s and LS3s and those have more compression.

 

Just ensure you have good cooling, and good fueling, and that you get the AFR's dialed in. You should be okay. My buddy is running near 12 on his blown high CUI LS engine. But he is running it on E85.