Super Thumper wrote on 05/03/13 at 06:53:15:I see than no one has mentioned the head gasket regarding this much larger 97mm piston. Be sure to check if the head gasket is protruding into the cylinder before installing it.
This Reply from Lancer.
No one I know of has had an issue with the stock head gasket.
The top of the pistons travel in the cylinder stops 4mm short of the top of the cylinder so there is no contact. The overhang of the gasket in the cylinder is very slight even so.
You can order a larger copper head gasket from a dude who sells all sorts of copper head gaskets on eBay. He does a nice job of it. It is not a thing that you "have to do" but if you feel better with them then do it. I bought several of the 96mm size from him to try out myself. I have used one of them so far...all went well with it.