binderm Posted May 22, 2010 Report Share Posted May 22, 2010 I tried a combustion by product test on my northstar and it showed a leak. how do I fine tune the test to determine which head or head gasket Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted May 22, 2010 Report Share Posted May 22, 2010 I think next you could pressurize individual cylinders to further diagnose. If you are taking the powertrain out of the vehicle to change the head gasket I would go ahead and timesert both heads at the same time and replace both gaskets. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
binderm Posted May 24, 2010 Author Report Share Posted May 24, 2010 I think next you could pressurize individual cylinders to further diagnose. If you are taking the powertrain out of the vehicle to change the head gasket I would go ahead and timesert both heads at the same time and replace both gaskets. Link to comment Share on other sites More sharing options...
binderm Posted May 24, 2010 Author Report Share Posted May 24, 2010 do you have to pull the power train to remove the heads or can it be done in the chassis Link to comment Share on other sites More sharing options...
Ranger Posted May 25, 2010 Report Share Posted May 25, 2010 Yes, the drivetrain needs to be dropped out the bottom. Link to comment Share on other sites More sharing options...
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