Help. What side is the IN on for my new piston from Dratv for the ATC 70

[MN250R]

Got my new 88cc kit for my atc 70 from dratv. Got the rings all lined up but there is no IN on the piston. I see a side that looks a little grinded on top. Wonder if thats it?:wondering
http://img29.imageshack.us/img29/8568/img517n.jpg (http://imageshack.us/photo/my-images/29/img517n.jpg/)

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http://img36.imageshack.us/img36/5015/img518.jpg (http://imageshack.us/photo/my-images/36/img518.jpg/)

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[atc007]

The biggest valve is the intake. So,the biggest fly cut goes intake side.

[MN250R]

ok, the side that looks like more metal is cut out is the side that has the grind marks on top

[Flossyb20]

The dimple will go on the right side when sitting on the bike...

[MN250R]

awsome thanks guys!