A Coated Skirt piston can be identified buy a (C ) in the end of the main part number for instance H345NP is not coated a H345DCP is coated

 

what is the main part number H345NCP-30, the main part number is H345DCP,, the 30 or .030 over bore is just the oversize of the bore or size of piston

 

Speed-Pro is the first supplier to the performance market to provide production pistons with a moly-graphite skirt coating. Proven in both OEM and racing applications, this unique coating delivers greater durability and reduced friction, while allowing the pistons to be installed with extremely tight cylinder bore clearances. The benefits that can be realized by optimizing an engine combination around this unique feature include quieter operation, lower emissions, better fuel economy and more power. The coating is applied in our manufacturing facility using a sophisticated process, and is then cured in place – it will not wear or flake off