If the block can be redone to 15mm theres a good chance 9/16 is possible which I can get the needed hardware for around $500 that is good for 150ft lbs, maybe more if it’s as underrated as the arp 7.3 IDI kit is.
First of all I know almost nothing about these engines. But I can tell you they don’t use GM 2 stoke injectors the injectors are different then the 53-149 series Detroits use as well as the EMD 567-710s. Both are rack controled unit injectors but other than that they are totally different injectors.
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