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THESE MEASUREMENTS ARE FROM GASKET SURFACE TO GASKET SURFACE HEAD/BASE GASKETS * LIFAN ENGINE CYLINDER LENGTHS (THE_HEADS_ARE_ALL_THE_SAME_HEIGHT) * (?) = IS THE DISTANCE CLOSER TO YOUR FRONT FENDER THAN A 50 OR 70

50CC & 70CC CYLINDERS ARE 63MM LONG____(MM'S_OVER_50&70)

90CC 100CC AND 110CC CYLINDERS ARE 69MM LONG_____(+6MM)1/4"

125CC W/54X54 BORE/STROKE CYLINDERS ARE 69MM LONG__(+6MM)1/4"

120/125/138 W/55.5 STROKE CYL'S ARE 78.5MM LONG___(+15.5MM)5/8"

140CC CYLINDERS ARE 81.5MM LONG________________(+18.5MM)3/4"

150CC CYLINDERS ARE 78.2MM LONG________________(+15.2MM)5/8"