Petty Officer 2nd Class
- Mar 29, 2006
may be common on the 4.3, however nearly never happens on the 5.0 or 5.7I'm guessing but not an xsput opinion ,the inlet manifold is leaking from the crossover into the intake runner.
check you have no sign of condensation in the oil filler cap .
pressure test the motor.
wherever its getting in from ,get onto it ASAP as water in the cylinders never ends well .