Internally balanced. Found a thread:- Is LS1 an internally or externally balanced motor? - LS1TECHAre all LS motors internally balanced or is yours balanced externally (flywheel)?.
No, but there is a place that makes pipes a short walk away from where the car is, so I can bend it to shape, and nip around there to flare it out and terminate it. So I should be fine.You will find it much to easier to install the line lock with the engine out. I did mine engine in and it was tricky. Do you have a pipe flaring tool?