Cast piston issues

[roachjuice]

So I took the head off my Omni today to start the process of swapping a single piston. I was told it was .020 over Mahles in there. No biggie. Well stamped on top of the piston is .025 and part number 5131402. Great. Anyone know where I can find a single .025 over cast piston?

[GLHS60]

Have you measured the piston yet?
I remember something about this a long time ago and there was some confusion on the .025.
The part #
5131402 025 really meant
5131402 .5 as in .020".

Going from memory.

Thanks
Randy

[roachjuice]

If that's the case then sweet. No I haven't measured it yet. I ran out of time. I'll try and pull it tomorrow. What's a stock one measure?

[GLHS60]

The stock bore is 3.445 and .020 would be 3.465. The piston skirt should measure about .0015 less., 3.4635"

Thanks
Randy

[roachjuice]

Sweet I'll check it tomorrow hopefully.

[roachjuice]

Cylinder bore is reading 3.464 according to my brown and sharpe dial calipers. So .020 over?

[roachjuice]

According to my iPhone calculator .025 is 3.470 which it's nowhere near that. So I'm gonna order a .020 over piston and run it!

[roachjuice]

http://img.tapatalk.com/d/14/01/12/y3u3ubap.jpg
Cylinder #3