Picked up a used 2000 rcsb recently. Was told it had flat top pistons. Pulled the oil pan to fix a leak and saw the casting number inside the piston was 12555820. I cannot find it anywhere. There was one post on ebay selling a set. They were the standard dished lm7 pistons. Any help would be appreciated. Thanks.

Kyle.

 

What's the question here? It seems that you got the answer, you have dished Pistons. Classic case of a shitty seller overselling his product.

 

Basically trying to see if anyone can confirm that I infact do have dished pistons. There isn't any info out there. None of the current part numbers match mine. Even on gmpartsdirect.Com. And yes, shitty seller. Nothing seems to be as advertised.

 

are you sure you read the number right, I cant find a cross reference for that number. 89060486 is the part number for flat tops used in the L33 and Gen4 5.3's.

 

The only reference I could find was an eBay seller. I've checked the part number several times. I thought maybe a 4.8 piston. The motor looks like a junk yard pull with many miles. Thanks.

kyle