Originally Posted by Kevin Amstutz
I perform all my own work and as one person said the Northstar is like a size 10 in a size 5 dress. What is the t-sirt update?
The bolts that secure the heads to the block come loose on Northstar engines, causing the head gasket to fail. Not if- but when, often around 100k miles. The engine needs to be remove to fix, and on the Bonneville GXP the engine needs to come out of the bottom- not from above. A major issue for DIY mechanics.
Here is a link with some info: