Why do you not trust thier reliability? GM's engine reliability has been proven over and over and easily tops most others, especially when it comes to V8's. Of course they like all manufacturers have had their bad apples, but overall they are one of the top for reliability. The small block chevy has been the longest running design over ALL other engines, and it was designed in the early 50's. Granted nowhere near the most efficient motor, but to say they arent reliable is just not true. No offense, but it sounds as though you just dont know much about them.
How many 300K mile SR's, KA's, B16's, 2JZ's, RB's, 1JZ's, etc. have you seen that are still running? I have personally seen (and owned quite a few) a lot more GM motors still going at 300K than any other, by a long shot. Of course I did have a GM 2.8 v6 turd once, now that was a shitty motor.
Great now I feel like a GM fanboy.
I <3 my SR too!