How much gap should there be on the sides? I don't have any .001 or .002" shim material, or a feeler gauge that thin.
My opinion: it seems that the groove of the ring is not straight at the bottom, this will affect the height of the grooveThe drawing for the piston (sheet 6) shows the bottom of the ring grooves as a reference dimension and if you take the reference (0.771) from the nominal dimension of the piston (0.873), that says the groove should be .051 deep. My piston's OD is right around 0.878, not 0.873. Should I try to keep the depth 0.051? I'm using the piston rings from Dave Reed as called out in the drawings. I think the rings were .044 thick