4.07 bore
4.1 stroke

I really hope this isn't a LQ4/lq9 block with that combo.

 

Why would you hope that it isn't an LQ4/LQ9 block???

 

Not much liner left and that really drops the piston out of the skirt on an LQ4 block. Lots of piston rock.

 

4.100
6.125
4.070

 

Did you swap injectors around to see if the problem followed?

 

All the more reason I'd like to see this dude succeed....LQ life isn't for everyone lol

 

I'd like to question...has anyone seen how extremely short you can get the skirts on a custom piston? I'd like to see that with an even shorter rod to help the top of the piston out some. 6.125" rod on a 4.100" arm only yields a compression height of about 1.065" compression height on a really fresh and tall 9.240" block.

 

You are getting out of the street driven vehicle area with that stuff. Shorter pistons that are more prone to rocking and shorter rods that put even more thrust on the face of the pistons are for the 1/4 mile crowd only. Or anyone else who is going to rebuild their engine fairly often.

 

Well I've decided to pull the heads and send them to wcch for their stg 3 program.

I'll pull the lifters and inspect as well as pull the cam - if I see bearing wear I'll likely pull the engine for a refresh or a new block. Depending on what I see will determine next steps but I'm really hoping for minimal wear and just a new cam and lifters so the build can "live" haha

 

good luck!!