6.0 bored .040 over
#7
TECH Veteran
iTrader: (5)
371ci or 6.1L. If you go that route be sure to have your machinist do a sonic check on the block prior to boring it out. My machinist said he has seen several 6.0L iron blocks be too thin at the water jacket to take it out that far. Luckily mine was thick enough. I would not go .040 out unless you are trying to fix a problem. Lots of off the shelf pistons for 4.030. 4.040 is going to require a custom slug.