If you don't have the special pcv arrangement and LS2 intake , probably not going to be an SD , unless its been modified , which can happen.
These further steps will document what you do have no matter what engine it is.
You will have defacto confirmation.
Picture one is the head code ID , #48 in this example.
Picture two is the head date code , H208 in this example.
It should only take a couple minutes to verify your carb , intake , and heads.
After that report from you , i will go into all the ID's on the block.
It is also easy stuff to find and capture.
