hrm.....this is making the LQ4 and LQ9 less and less different

but it also has me worried about these LS1 heads I put on.....10.8:1 is ALOT higher than I was counting on, I'm not too sure I want to run 10.8:1 with 91 octane (that's ALL I can get in Cali/Nevada)

 

Here is an 01+ 6L that I took apart a couple years back:

The dish is kinda hard to miss.

 

Nope not mine, Flat no ridge.

 

OK...that is NOT what mine looked like like.....

 

Yelo - if its running well and not pinging under loads, I wouldn't worry about the compression. Worst case, a good tune will fix it up. With flat tops, you'll benefit from a tighter quench, which will fight off detonation.


LQ9 got revised pistons with coated skirt and stronger connecting rods.

LQ9 on left, 01 LQ4 on right

 

Yeah.....it runs fine.....I'm gonna get it tuned next week to combat the idle and warm-start issues I'm having but otherwise it's fine.....

I was just suprised to see a flat-top piston in a non-HO 6.0...that would make it the same stock compression as the LQ9

 

Thats assuming the chambers on the iron heads were the same size and the piston deck height is the same.

 

True....they definitely come "out of the hole"...but by how much I didn't measure

 

Those LQ9 pistons and rods look strong as hell.

 

Coulda swore the broken piston pics Parish posted on his original 6.0L showed the dish area like Richard posted.....