Type: Thermostat Housing Kit With 2pcs M6 20 screws. Fits 1.5" Hose and Accepts for GM Original Thermostat. Improves flow by 20% over the factory thermostat housing. For GM LS engines LS1,LS2,LS 3,LS7,LS9,LSA,L76 and L92.
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For GM LS Engine Swivel Thermostat Housings Water Neck 90 1.5" Black Billet