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Cranking compression in 4 is 195 and 6 is 185

Helping a friend with their 2009 suburban that had a stuck cylinder 6 DOD lifter. Pulled the head replaced lifters cylinders 4 and 6 with HL124's and replaced the VLOM. Deactivated the DOD today in...

Is there really that much difference between a Lacrosse pcm and a Pontiac Grand Prix 3.8, Monte Carlo 3.8 or Impala 3.8?