For LS family of engines LS1 LS2 LS6 LM7. (Will not fit Fast Intakes). Not having 4 AN coolant crossover will allow steam pockets to build up in the highest point of your cylinder head and create hot pockets.
Stainless Steel Complete Coolant Crossover Steam Vent Kit Parts For LS1 LS2 LS3
Stainless Steel Complete Coolant Crossover Steam Vent Kits For LS1 LS2 LS3
For LS1 LS2 LS3 Stainless Steel Complete Coolant Crossover Steam Vent Kit Parts
Stainless Steel Complete Coolant Crossover Steam Vent Kits For LS1 LS2 LS3 US
Stainless Steel Complete Coolant Crossover Steam Vent Kits For LS1 LS2 LS3 LS6
Stainless Steel Complete Coolant Crossover Steam Vent Kit For LS1 LS2 LS3 LS6