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Can anyone tell me which direction to install an oversized piston In a Tecumseh HS40 engine? The top of the piston has .010 stamped on the outer edge but no arrow like the stock piston. Wondering if the .010 goes towards the valves or the front the the block?

I am fairly new to the forum. As owner of a few old Rupps, I am seeking some information on a couple of items. 1. In my old Tecumseh manual the specs say the valve seat angle on the hs40 is 45 degrees. However, a diagram on different page shows a 46 degree seat angle. Which is the correct angle...