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I agree - the GM dealers around have no clue about how to work on anything that you plug a scanner into. The last time I went to the Chevrolet place for parts for my old '84 K10, the service manager (a 30 something year old genius) commenced to tell me how I ought to be looking into getting...

6.5 heads will wake up a stock N/A 6.2 because of the bigger precup ports, but you can hurt the engine when revving it high or working it really hard because without the boost of the turbo, the EGT's can go through the roof if it getting too much fuel. Its actually easier to melt down a N/A 6.2...

ARP studs are better for sure, and best of all they are reuseable, but I have had a couple of turbo engines with new stock replacement bolts, and they hold up fine up, but they are "one use" bolts as well.

As far as my dream build, I have just about everything for as close as I'll ever get to my dream build. I have a late model 6.5 Navistar enhanced block with the late model heads with diamond precups. I also have an open single plane intake from a early 90's N/A 6.5, and a 4911 6.5 turbo...

Besides the slightly different injector angle, the biggest difference is the size of the ports in the precups. The 6.2 precups have small, round d-shaped ports and the 6.5 have wider, bigger o blong shaped ports. The diamond precups used in 6.5 turbo engines will make more power than 6.2...