Thanks for the feedback so far.
Just to clear up what I've done. I've removed the head and sump and removed number 1 piston and measured it at 3.495 with my digital calliper at its widest.
The rings were pretty loose and easy to remove so I've taken these off and then placed the piston back in the bore (no rings) and at this stage I can fit a .010 feeler which holds the piston on place approx half way down the bore.
Other than a bit of black smoke on start up, the oiling of the plugs which meant making sure it was full warm before stopping and the slightly excessive oil consumption the truck was running pretty well with no noises Other than the usual noise a 216 makes :-)
What are the tolerances for piston clearance? Am I looking at a re-bore?
Cheers
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41 Chevy