This Is NOT OEM spring set. These are a upgrade to OEM and highly recommended. I have noticed after machining several sets of heads, after testing the springs I have been finding the stock spring to be weak and inconsistent. I feel this is often the source of common lifter roller damage and partially the cause for bent pushrods. Specs and official description are as follows.
 
These fit the LT based truck engines from 2014+ with direct injection. They are an excellent add on to the full mechanical Delete Kit.

GM .570" lift single beehive valve spring set. This valve spring set is a performance replacement for stock LS valve springs, commonly known as the "blue spring", or the "yellow spring". These spring set uses your stock factory seats, seals, retainers and locks. These springs are a good choice for stock replacement and mild street performance usage with stock rockers arms up to .570" lift.
 
Outer Spring Diameter 1.290" O.D.
Install at 1.800" for 90 lbs seat pressure
Open Pressure 295 lbs at 1.250"