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.

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Results 1 - 18 of 18

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

3.5 out of 5 stars ( 2 )

Estimated Ship Date: Today

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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: Today

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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: Today

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Trick Flow® Engine Steam Line Plumbing Kits for GM LS TFS-306SB601

Engine Steam Line Plumbing Kit, Four Corner, Aluminum, Black Anodized, Chevy, Small Block LS, Kit

Part Number: TFS-306SB601

4.08 out of 5 stars ( 50 )

Estimated Ship Date: Today

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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: Today

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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: Today

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Trick Flow® Engine Steam Line Plumbing Kits for GM LS TFS-306S0601

Engine Steam Line Plumbing Kit, Four Corner, Aluminum, Black Anodized, Chevy, Small Block LS, Kit

Part Number: TFS-306S0601

4.36 out of 5 stars ( 14 )

Estimated Ship Date: Today

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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 ( 2 )

Estimated Ship Date: Today

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Trick Flow® Engine Steam Line Plumbing Kits for GM LS TFS-306SB600

Engine Steam Line Plumbing Kit, Front Kit Only, Aluminum, Black Anodized, Chevy, Small Block LS, Kit

Part Number: TFS-306SB600

4.33 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Earl's Performance LS Steam Vent Kits LS0036ERL

Engine Steam Tube Kit, Four Corner, Stainless Steel Tubing, Aluminum, Black Anodized, Chevrolet, Small Block LS, Kit

Part Number: EAR-LS0036ERL

3.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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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: Today

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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: Feb 17, 2026 if ordered today

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Estimated Ship Date: Feb 17, 2026 if ordered today

Trick Flow® Engine Steam Line Plumbing Kits for GM LS TFS-306S0600

Engine Steam Line Plumbing Kit, Front Kit Only, Aluminum, Black Anodized, Chevy, Small Block LS, Kit

Part Number: TFS-306S0600

4.4 out of 5 stars ( 5 )

Estimated Ship Date: Today

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Trick Flow® Engine Steam Line Plumbing Kits for GM LS TFS-30600601

Engine Steam Line Plumbing Kit, Four Corner Kit, Aluminum, Black Anodized, Chevy, Small Block LS, Kit

Part Number: TFS-30600601

2.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

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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: Today

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Trick Flow® Engine Steam Line Plumbing Kits for GM LS TFS-30600600

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

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Nitrous Outlet Engine Coolant Crossovers 03-51024

860 Performance Steam Vent Distribution Block - 1in / 4out / 1/8" NPT Ports

Part Number: NXO-03-51024

Not Yet Reviewed

Estimated Ship Date: Jan 7, 2026 if ordered today

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Estimated Ship Date: Jan 7, 2026 if ordered today

Philadelphia Racing Products Coolant Crossover Kits PRP-4530

Engine Coolant Crossover, -4 AN Hose/Fittings, Black, Chevy, Kit

Part Number: PGP-PRP-4530

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

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 ( 14 )

Estimated Ship Date: Today

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