Gen III PCMs - Small Block Chevy

The Powertrain Control Modules released to control Chevy's 3rd Generation Small Block V8 Engines

Identification

Gen III PCMs (like others) have a pair of identification numbers by which they can be differentiated.

Service Number

This is the top number on the label, abbreviated SERV. NO. on the printed label.

Hardware Number

This is the bottom number on the label, abbreviated HDW. NO. on the printed label.