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Coolant Crossover Pipes & Kits
Pockets of air or vapor can form inside the coolant passages of your engine block, and if they get stuck in there, they can prevent proper coolant circulation, creating...
Pockets of air or vapor can form inside the coolant passages of your engine block, and if they get stuck in there, they can prevent proper coolant circulation, creating “hot spots” that can throw off your tune, or even cause premature combustion. In engines where the thermostat sits at the highest point of the cooling system, these bubbles can easily escape. On other engines—most notably the LS—the thermostat is positioned lower, so the bubbles need another way out. The LS solves this issue with steam ports on the top of the block where these bubbles can escape, and coolant crossover lines (also called steam lines or pipes)...
Pockets of air or vapor can form inside the coolant passages of your engine block, and if they get stuck in there, they can prevent proper coolant circulation, creating “hot spots” that can throw off your tune, or even cause premature combustion. In engines where the thermostat sits at the highest point of the cooling system, these bubbles can easily escape. On other engines—most notably the LS—the thermostat is positioned lower, so the bubbles need another way out. The LS solves this issue with steam ports on the top of the block where these bubbles can escape, and coolant crossover lines (also called steam lines or pipes) carry them to the radiator overflow tank.
If you’re upgrading the intake manifold of your LS engine, you’ll need to remove the factory coolant crossover plumbing. While you’re at it, might as well upgrade the crossover as well! Aftermarket steam line kits are more versatile, provide better flow for improved cooling, are easier to service later, and look great, too.
Top Brands
An aftermarket coolant crossover helps your high performance engine run at peak efficiency and safety, so make sure you’re getting the genuine article at Summit Racing Equipment. Our selection only includes brands we’d use on our own project vehicles, like Trick Flow, Earl’s Performance, and Holley, plus kits from our own Summit Racing brand.
Showing In Stock Items. Show All 15 Items.
LS Coolant Steam Crossover Kit, Four Corner LS Steam Vent Kit, Stainless Steel Hardlines with Black Anodized Steam Port Adapters, Chevy, LS, Kit
Part Number: SUM-220959X
Estimated Ship Date: Today
Estimated Ship Date: Today
BUILD IT WITH SUMMIT!
Summit Racing™ Pro LS Steam Line Kits SUM-220952
Steam Line Plumbing Kit, Engine Coolant Crossover, Aluminum, Black Anodized, Chevy GM, LS/LSX, Gen III/IV, Kit
Part Number: SUM-220952
Estimated Ship Date: Today
Estimated Ship Date: Today
Engine Steam Tube Kit, Four Corner, Stainless Steel Tubing, Aluminum, Black Anodized, Chevrolet, Small Block LS, Kit
Part Number: EAR-LS0036ERL
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Engine Steam Line Plumbing Kit, Four Corner Kit, Aluminum, Black Anodized, Chevy, Small Block LS, Kit
Part Number: TFS-30600601
Estimated Ship Date: Today
Estimated Ship Date: Today
Engine Steam Line Plumbing Kit, Front Kit, Aluminum, Black Anodized, Chevy, Small Block LS, Kit
Part Number: TFS-30600600
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Engine Coolant Crossovers, LS Steam Vent Kits, Aluminum, Black Anodized, Chevy, Small Block LS, Kit
Part Number: HLY-26-550
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Engine Coolant Crossovers, LS Steam Vent Kits, Aluminum, Black Anodized, Chevy, LS, Kit
Part Number: EAR-LS0041ERL
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Engine Coolant Crossover, LS Steam Vent, Aluminum, Black Anodized, Chevy, Small Block, Kit
Part Number: HLY-26-552
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Engine Coolant Crossovers, LS Steam Vent Kits, Aluminum, Black Anodized, Chevy, Small Block LS, Kit
Part Number: EAR-LS0014ERL
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Engine Coolant Crossovers, LS Steam Vent Kits, Aluminum, Black Anodized, Chevy, Small Block LS, Kit
Part Number: HLY-26-551
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Engine Coolant Crossovers, LS Steam Vent Kits, Steel, Zinc Finish, Chevy, Small Block LS, Kit
Part Number: EAR-LS0016ERL
Estimated Ship Date: Mar 11, 2026 if ordered today
Estimated Ship Date: Mar 11, 2026 if ordered today
This product may not be eligible for select promotional offers
