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 - 25 of 47

Summit Racing™ Coolant Steam Port Crossover Kits SUM-220960

Coolant Crossover, Billet Aluminum, -4AN Braided Stainless Hose, LS Throttle Body Bypass Hose Kit Coolant Steam Crossover, W/ Vent, LS1, LSX, Kit

Part Number: SUM-220960

3.4 out of 5 stars ( 5 )

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

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Earl's Performance LS Steam Vent Kits LS0041ERL

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

Part Number: EAR-LS0041ERL

5.0 out of 5 stars ( 1 )

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

ICT Billet Coolant Crossover Kits 551694H

Coolant Crossover, Billet Aluminum, LS Throttle Body Bypass Hose Kit Coolant Steam Crossover, LS1, LSX, Kit

Part Number: ICB-551694H

4.63 out of 5 stars ( 16 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Holley LS Steam Vent Kits 26-552

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

Part Number: HLY-26-552

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Nitrous Outlet Coolant Crossovers 03-51000

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

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

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Summit Racing™ Coolant Steam Port Crossover Kits SUM-220961-B

Coolant Crossover, Billet Black Aluminum, -4AN Braided Stainless Hose, LS Throttle Body Bypass Hose Kit, NO Vent, Rear balance Crossover, Kit

Part Number: SUM-220961-B

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

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 )

Estimated Ship Date: Sep 8, 2025 if ordered today

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Estimated Ship Date: Sep 8, 2025 if ordered today

Need It Sooner? We recommend these similar substitute parts:

Summit Racing™ Coolant Steam Port Crossover Kits SUM-220960

3.5 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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Nitrous Outlet Engine Coolant Crossovers 03-51008

860 Performance Hard-Lined LSX Steam Vent Kit

Part Number: NXO-03-51008

Not Yet Reviewed

Estimated Ship Date: Aug 18, 2025 if ordered today

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Estimated Ship Date: Aug 18, 2025 if ordered today

ICT Billet Coolant Crossover Kits 551679

Engine Coolant Crossovers, Billet Aluminum, Natural, Chevy, Small Block LS, Kit

Part Number: ICB-551679

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

PWR North America Steam Vent Kits for GM LS Engines 78-10000

Engine Steam Vent Kit, Chevy, Small Block LS, Kit

Part Number: CIR-78-10000

1.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow if ordered today

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Estimated Ship Date: Tomorrow if ordered today

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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Need It Sooner? We recommend these similar substitute parts:

Holley LS Steam Vent Kits 26-550

5 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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ICT Billet Engine Coolant Crossovers HS-LS01-2P

LS Cylinder Head Coolant Steam 2 Port Crossover Hose Kit Black

Part Number: ICB-HS-LS01-2P

Not Yet Reviewed

Estimated Ship Date: Aug 18, 2025 if ordered today

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Estimated Ship Date: Aug 18, 2025 if ordered today

ICT Billet Engine Coolant Crossovers HS-LS01-4P

Cylinder Head Coolant Steam 4 Port Crossover Hose LS Low Profile Intake Kit

Part Number: ICB-HS-LS01-4P

Not Yet Reviewed

Estimated Ship Date: Aug 14, 2025 if ordered today

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Estimated Ship Date: Aug 14, 2025 if ordered today

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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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: Sep 19, 2025 if ordered today

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Estimated Ship Date: Sep 19, 2025 if ordered today

Earl's Performance Adjustable Coolant Crossover Tubes LS0037ERL

Engine Coolant Crossover, Tube, Adjustable from 6.8 in. to 10.5 in., -12AN O-Ring Ports, Billet Aluminum, Black Anodized, Chevrolet, LS, Each

Part Number: EAR-LS0037ERL

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Nitrous Outlet 860 Performance Hard Lined LSX Tall Deck Steam Vent Kits 03-51001

860 Performance Water Vapor Bleed Cross Over Kit. Designed to work with LS7 Tall Deck engines

Part Number: NXO-03-51001

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Earl's Performance Adjustable Coolant Crossover Tubes LS0035ERL

Water Pump Crossover, Billet Aluminum, -12 AN Female Inlets, -16 AN Male Outlet, Black Anodized, Adjustable, Each

Part Number: EAR-LS0035ERL

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Chevrolet Performance Engine Coolant Crossover Pipes 12694769

Engine Coolant Crossover Pipe, Stainless Steel, Natural, O-rings, Chevy, LS, Kit

Part Number: NAL-12694769

4.83 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

ICT Billet Coolant Crossover Kits 551837-LS01

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

Part Number: ICB-551837-LS01

4.0 out of 5 stars ( 3 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

ICT Billet Coolant Crossover Kits 551692

Engine Coolant Crossovers, Billet Aluminum, Natural, Hoses, Bypasses Throttle Body Coolant Line, Chevy, Small Block LS, Kit

Part Number: ICB-551692

4.33 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

ICT Billet Coolant Crossover Kits 551694

Engine Coolant Crossovers, Billet Aluminum, Natural, 1/8 in. NPT Threaded Adapters, Chevy, Small Block LS, Kit

Part Number: ICB-551694

3.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

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