[Doug I]

Ok ...
cylinder = 3.5511 in.
piston = 3.5507 in (4/10000 clearence ?)
end gap = 0.030 in

piston perfectly centered in cyliner

Blow-by area = 0.00000600 sq.in.

If the piston moves over and touches the cylinder wall the area less than 0.000000005 sq.in.

If it moves the other way the area is 0.00001200 sq.in.

regards