I bought 5177 with the turbo installed
I never got around to experimenting with 5177, but one of my thoughts was water injection to drop the charge temp and reduce chance of pre-combustion.
If you notice the "barn find" does have sometype of injection. given the two hoses I would guess N2O/fuel.
when the builder disassembled 5177's engine his comments were the heads were "trash" in that the chambers had been opened to drop the CR below 7:1
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