Northstar Engines and System Technical Discussion Discussion, 2001 Northstar piston to rod orientation? in Cadillac Engine Discussion; Is the wrist pin hole offset on these pistons or are they reversible? any input would be appreciated.
Automobile(s): 2002.5 F55 STS, 2014 Explorer XLT 4WD
MD Eastern Shore
Re: 2001 Northstar piston to rod orientation?
The pistons and rods are orientation specific. Each has locator arrows stamped/etched into the rod/piston crown. Diagrams in the GM service manual. Several posted in the overhaul thread by daveyhouse, as well as the ring orientation.
I marked mine when i took them out but the pistons were reversed from bank to bank. there is what looks like a drain back traugh on the piston at bottom of pin hole. one side points towards center of block and the other side points out. ill get on GM SI and dig deeper.