Outer Limits 4x4 Board

Those in the know..
How do you tell regarding pistons, whether its a genuine toyota or acl..or another brand.. ??
Ive bought a 1hdt motor
one piston is out..
rest are still in the motor..
motor was pulled down and revealed a cracked piston in one cylinder and supposedly a broken ring in another
head was put back on soo I could use a engine crane to pick it up when i bought it.
Soo ive got a piston in a bucket and some stamp or lettering on the underside of the piston..

Im confident its not genuine as they just dont crack..
ACL pistons are known for their cracking..

Soo milo, you've had one of these apart or anyone know ?
Cheers

Normally you cant, piston manufacturers put the least amount of stress raisers they can on the piston. Im surprised that ACL pistons have the reputation for cracking. I have used them all of my mechanical career with no issues. Mind you, I have not rebuilt every engine either.

I tried to upload a pic or two but the file is too big..
Left hand side underneath has
ART
right side...
1K13
17020

in this configuration

bloke thats going to build the motor has rebuild nearly 50 or soo 1hdt
soo really knows this motor
his only ever had one engine fail
because they got a engine shop to rebuild a motor
specified genuine parts
engine shop used ACL and they cracked in the warranty period.

The bloke swears by the genuine stuff in these engines