I am swapping a LQ4 into a 94 Chevy truck and wanted to know what you guys do with that little 3/8" coolant line that goes from the driverside head to the throttle body and then to who knows where since I don't have donor vehicle. I know on my LT1 swap that I made a 1.5" pipe with 3/8 barbed fitting coming out of the side and cut my upper radiator hose and put that piece in as the 3/8" line was important to bleed the air out of the LT1 heads heads. Is this also true of the LS series engines and I need to do something similar for that line or do you all just plug it. I thought it might not be important since I don't see anything on the passenger side head to bleed the air out. LT1's have a pipe going between each head in the back and that line goes to 1 line down the intake and tied into the upper radiator line on LT1s but I don't know where this 3/8 LQ4 line is suppose to go and how important it is.

Brian