CorvAircraft> How can you tell the difference between cast and forged pistons?

[Keith Rhea]

I bought a converted 95 hp engine that had flown on a Piet for 200 
hours, was overhauled flew 8 more hours, lost RPM and landed in a corn 
field. I bought the engine all torn down and all the parts, prop 
included.  I have checked the crank and cyls and they are standard. My 
problem is i can't determine if the pistons are cast or forged.  They 
an "F" beside the wrist pin and inside the piston is a "C" with an n 
inside of it.  I see what would be die marks for casting.  Then when i 
read about Clarks forged description and they state on page 22 that 
their sealed power forged pistons look like they have casting marks on 
them.   Other than the 601 cowl and spinner, I have everything to make 
a flight worthy engine.  And that won't be too far off.  Maybe another 
month or so.  Can anyone tell me for sure what these pistons are?  I 
would hate to order a set from Clarks and find that's what i already 
had.

Thanks


Keith Rhea
N52VP