Had to go back and listen to CSI nspectahs potcast again just to get all my facts strait. He did say chem 1 is a 12 + weeker, that's got more hazy fluffy buds. He thinks chem 91 looks a lot like some of the landrace indicas that were around the oregon area in the 80s. He also says possibly a Mexican indica, or indica sativa hybrid from the early days of oregon.
I would speculate its got some mix of Afghani, possibly Mexican genetics. Wonder what the sativa is though if it's truly part of the genetic makeup
Funny how og kush is said to come from Florida but proliferated of the west coast and chemdawg is said to come from Oregon and proliferated on the east coast. Not to derail things, I just love weed history and how it intertwines