I’ve not had a 6.5, but I’ve ran 4 different 6.2s at one point or another. Still have one 6.2. The biggest issue these engine have is a very heavy starter and it should have a bracket on the front for support. Many times people will install a new starter and not reinstall the bracket. Over time, the two bolt holes on the rear by the bellhousing will crack.... sometimes they crack and other times the bolts shear off in the block...
Bottom line, make sure you have the front support bracket installed!! If yours doesn’t have one They can be found cheap online.
Also check out the harmonic balancer... if they go bad, it can cause cracks in the block at the main web bolt holes and if bad enough it can even break the crank.
These items if checked and maintained will make your 6.5 last a long time.
Last edited by Tony292; 10/09/2020 12:41 AM.
