Northstar Engines and System Technical Discussion Discussion, What Causes Heagaskets To Blow? in Cadillac Engine Discussion; Hi, I was wondering what causes the headgaskets to blow and at what miles does it usually happen? Thanks....
Automobile(s): White Diamond '03 DHS (with DTS floor shift)
Re: What Causes Heagaskets To Blow?
Usually the head bolt threads pull. There is no "usual" mileage. Some go at 75K or so. Others are still good at 250K. Pre 2000's are more prone to failure though. Keeping up with the cooling system maintenance may help.
I am pretty sure that AJ is spot on in his theory. I have a bit of one myself, I have rarely seen them blow in the south where it's warmer, mostly in the northern, colder states. I am thinking that quick cool downs from being hot might have some effect on it, but I have no proof.