The 6.2 might all be 58x. I wonder if you can have the reluctor changed out ... seems like you could.
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Yes, you are correct there.Are they the same CRANK, or just the same STROKE?
I bet the balance is way different, which might mean the same casting but different drilling for balance; or it might mean entirely different castings with bigger/smaller counterweights that could be...difficult...to balance correctly.
I don't know...but you need to find out.
The smallish 4.8L engine use a specific 3.26-inch stroke while the 5.3L, 5.7L, 6.0L and even the 6.2L engines all spin a 3.622-inch factory arm. It’s also possible to interchange these cranks to allow using a 5.3L crank in a 6.0L block and balance will be close. GM achieved this by making its smaller bore pistons heavier so that balance between all the various displacements would not require massive machining.
$600 is a little bit on the high side, but not unfairly so - especially considering inflation. Make sure that he doesn't bore the cylinders until he has the pistons in hand. I ran back and forth with my machinist when I realized my ring end gaps were too big, and discovered my block was actually bored to 4.033". When I asked him he told me the Sealed Power pistons were machined to 4.030"! Fortunately he bores the blocks to match the pistons so I was okay. The .032" ring end gap isn't terrible, and it's not like I had many options - they're the Sealed Power rings spec'd for the pistons.
Yup. The option now is:Summit sells a whole kit with pistons and crank to get a 408.