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)...

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.

Individual Parts

Part Groups

Results 1 - 11 of 11

Summit Racing™ Pro LS Steam Line Kits SUM-220959X

Summit Racing™ Pro LS Steam Line Kits SUM-220959X

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

2.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

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

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Summit Racing™ Pro LS Steam Line Kits SUM-220950B

Steam Line Plumbing Kit, Engine Coolant Crossover, Four Corner, Aluminum, Black Anodized, Chevy GM, LS/LSX, Gen III/IV, Kit

Part Number: SUM-220950B

3.29 out of 5 stars ( 7 )

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Trick Flow® Engine Steam Line Hoses for GM LS TFS-306SB601K

4 out of 5 stars ( 13 )

Estimated Ship Date: Tomorrow

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Summit Racing™ Pro LS Steam Line Kits SUM-220950

Steam Line Plumbing Kit, Engine Coolant Crossover, Four Corner, Aluminum, Black Anodized, Chevy GM, LS/LSX, Gen III/IV Kit

Part Number: SUM-220950

2.33 out of 5 stars ( 6 )

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Trick Flow® Engine Steam Line Hoses for GM LS TFS-306SB601K

4 out of 5 stars ( 13 )

Estimated Ship Date: Tomorrow

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Summit Racing™ Pro LS Steam Line Kits SUM-220952B

Steam Line Plumbing Kit, Engine Coolant Crossover, Aluminum, Black Anodized, Chevy GM, LS/LSX, Gen III/IV, Kit

Part Number: SUM-220952B

1.0 out of 5 stars ( 2 )

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Need It Sooner? We recommend these similar substitute parts:

Trick Flow® Engine Steam Line Hoses for GM LS TFS-306SB601K

4 out of 5 stars ( 13 )

Estimated Ship Date: Tomorrow

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Holley LS Steam Vent Kits 26-553

Coolant Crossovers, LS Steam Vent, Aluminum, Black Fitting, Nylon Braided Hose, Black, 4 AN Size, Kit

Part Number: HLY-26-553

4.75 out of 5 stars ( 4 )

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Holley LS Steam Vent Kits 26-550

5 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Nitrous Outlet Coolant Crossovers 03-51000

860 Performance Water Vapor Bleed Cross Over Kit for LS1/2/6 FAST 90/92mm

Part Number: NXO-03-51000

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Holley LS Steam Vent Kits 26-550

Engine Coolant Crossovers, LS Steam Vent Kits, Aluminum, Black Anodized, Chevy, Small Block LS, Kit

Part Number: HLY-26-550

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Earl's Performance LS Steam Vent Kits LS0016ERL

Engine Coolant Crossovers, LS Steam Vent Kits, Steel, Zinc Finish, Chevy, Small Block LS, Kit

Part Number: EAR-LS0016ERL

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Jan 14, 2026 if ordered today

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Estimated Ship Date: Jan 14, 2026 if ordered today

Earl's Performance LS Steam Vent Kits LS0014ERL

Engine Coolant Crossovers, LS Steam Vent Kits, Aluminum, Black Anodized, Chevy, Small Block LS, Kit

Part Number: EAR-LS0014ERL

Not Yet Reviewed

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Summit Racing™ Coolant Steam Port Crossover Kits SUM-220960

3.25 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Holley LS Steam Vent Kits 26-551

Engine Coolant Crossovers, LS Steam Vent Kits, Aluminum, Black Anodized, Chevy, Small Block LS, Kit

Part Number: HLY-26-551

5.0 out of 5 stars ( 4 )

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Need It Sooner? We recommend these similar substitute parts:

Summit Racing™ Coolant Steam Port Crossover Kits SUM-220960

3.25 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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