what do you mean minimum? Are you asking what the length of the block is from the main tunnel centre to the top of the deck? A standatd holden is anywhere from 8.895-8.855"
Are you asking what the piston to deck is standard .040"-.055" Most are on the higher side. Or are you asking what is the closest you can run the piston to the top of the deck? Zero is good and if your brave 10thou up is ok as long as it hasnt got forgies that rock with major bore clearance. If you have a thick headgasket you can run them up more. Min piston to head depending on rod type and piston type and RPM would be safer to be .037"
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