Adding a turbo to your LS and have a 4-port MAC valve you need to mount? Don't buy a billet mount, buy this bolt on mount made with Colorfabb HT which is good for engine bay temps and all automotive fluids.
Mounts on the passenger side on the front of the cylinder head behind the water pump. Uses M3 bolts and nyloc nuts and a slot for redundant zip tie (not included). MAC Valve not included.