Federal Emission

Piston to Bore Clearance [1] 0.012 - 0.044 mm (0.0004 - 0.0017 inch)
Weight 325 - 335 grams (11.47 - 11.82 ounces)
Land Clearance (Diametrical) 0.734 - 0.797 mm (0.029 - 0.031 inch)
Length 64 mm (2.520 inch)

RING GROOVE DEPTH:
Number 1 3.989 - 4.188 mm (0.157 - 0.165 inch)
Number 2 4.462 - 4.661 mm (0.176 - 0.184 inch)
Number 3 3.847 - 4.131 mm (0.151 - 0.163 inch)

[1] 17.5 mm (11/16 inch) from bottom of skirt.