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For LS family of engines LS1 LS2 LS6 LM7. (Will not fit Fast Intakes). For 4AN Anodized Black Aluminum Steam Vents with Hardware & Hoses for Front & Rear Venting. 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.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.