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One additional thing I’ve come across that’s different is the oil pan. They visual seem very similar but the oil dipstick location is higher on the 6.5 than on the 6.2. Only realized it because the dipstick tube wasn’t lining up with the bolt on the exhaust manifold for securing it. I’m...

Turns out both the transmission bell housing bolts and the motor mount bracket to block bolts were indeed standard thread on my 6.2 and now metric on the 6.5 Optimizer. The new correct thread size is M10-1.5 for both bolts. The motor mount bolts previously were 1-1/8” long so I ordered 30mm...

Thanks for the heads up! I have a fluid damper I’ll be swapping over so I’ll be able to leave out the spacer and it should be good there. I ordered the side mount turbo version so I believe the 6.5 intake I have should bolt up. I also got a “dummy” crank position sensor to plug that hole on...

Maybe it is just the bellhousing bolts then. I recall that was a 3/8 bolt on my 6.2 as I changed some of them when I had the transmission out last year. But I’ll double check to confirm. That’s good to know the motor mounts are already metric so that’ll save some searching.

Well after the issues I encountered with my 6.2 block and failed rebuild I decided to purchase a new 6.5 Optimizer. I'd like to have everything I need on hand when it arrives so ideally it is a fairly quick swap and I don't have to wait for parts. I've heard that the few remaining bolts on the...