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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.
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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When upgrading your LS-powered vehicle, don't forget to replace the factory steam tubes. Our Summit Racing™ Pro LS steam line plumbing kits eradicate trapped air and steam pockets from your engine to prevent hot spotting and overheating as well as provide more flexibility when using aftermarket intakes. Kits vent all 4-corners (except SUM-220952 and SUM-220952B kits) and contain black anodized billet aluminum fittings, steam port adapter, O-rings, stainless steel bolts, -3AN or -4AN hose and hose ends, (stainless steel hard lines and 5-port distribution block on SUM-220959 kit only) to make installation easy and more attractive than OEM lines, offering a cleaner look and better waterflow.
( 18 )
$74.99
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$169.99
Summit Racing™ Coolant Steam Port crossover kits deliver cool performance and looks. Featuring beautiful billet aluminum construction, our kits will bypass the hot engine coolant from your throttle body for better performance and vent the steam from the front of the cylinder heads to the radiator or balance the flow between the rear of heads to help reduce engine temperature. Keep your engine happy and running at an optimal level with Summit Racing™ Coolant Steam Port Crossover Kits.
( 13 )
$39.99
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$88.98
Chevrolet Performance engine coolant crossover pipes are designed to vent the coolant to ensure that the coolant reaches the highest point on the cylinder heads and doesn't get blocked by an air pocket. They are manufactured from quality materials and install in the stock location for a direct fit.
( 6 )
$59.99
Your modified LS-powered cars and trucks will be easier to service with an upgrade to a race car plumbing system. These plumbing kits contain black anodized billet aluminum fittings, O-rings, stainless steel bolts, and all of the necessary hose to plumb just the front of the heads or all four corners. Choose the most desirable upgrade to your factory steam tubes--Trick Flow® engine steam line plumbing kits for GM LS.
( 75 )
$101.99
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$148.95
On Sale
Holley LS steam vent kits prevent hot spots or overheating. Designed to eliminate trapped air and steam from your engine, these complete kits are available to plumb your engine and include the appropriate hose and hose ends to make installation a breeze. They are more attractive than the OEM lines and offer increased flexibility when using aftermarket intakes and other accessories on your performance vehicle. Holley LS steam vent kits may feature: * Adjustable pivoting steam vent adapters * Black push-on or stainless braided Speed-Flex hose and hose ends * Available in front or 4-corner plumbing options
( 11 )
$170.95
$62.45
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$153.85
Whether you are replacing a rusted crossover pipe or doing a head swap, ICT Billet coolant crossover kits help increase the flow of coolant through the engine block, reducing engine temperature. They are made from aerospace-grade billet aluminum with a natural finish. By increasing the flow of coolant in the block, thereby reducing engine temperature, you can eliminate hot cylinders and detonation.
( 30 )
$43.99
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$197.99
On Sale
Earl's Performance adjustable coolant crossover tubes simplify the plumbing of a remote mounted electric water pump by eliminating Ts, Ys, and extra hose ends. The design of these special crossover tubes allows for adjustable length—and for use as a coolant inlet or outlet on your engine. They're constructed from billet aluminum with a black anodized finish.
( 1 )
$279.95
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$318.95
$153.95
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$175.95
Earl's Performance LS steam vent kits eliminate trapped air and steam from your engine to prevent hot spots and overheating. They offer a selection of these LS power plumbing kits, with the appropriate braided stainless steel Speed Flex hose with hose ends that make installation easier and much more attractive than OEM hard lines. Plus, they provide more flexibility when you're using aftermarket intakes and other accessories on performance vehicles. The kits are available in front and 4-corner plumbing options, with adjustable anodized aluminum steam vent adapters and/or distribution blocks. Plumb your LS for performance with Earl's steam vent kits.
( 5 )
$299.95
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$349.95
Nitrous Outlet coolant crossovers stop hot cylinders and pre-detonation. First, the easily installed water vapor bleed kits help to distribute heat from cylinder to cylinder, decreasing temperature variation. Then the coolant crossover lines increase the flow through the engine block, reducing engine temperatures. Nitrous Outlet kits feature billet aluminum distribution blocks and stainless steel pre-bent hard lines or braided flex lines; they enable you to run these systems on your car all year long without the worry of a bursting hose, rust, or corrosion. The selection of coolant crossover kits comes complete with the necessary fittings and adapters to make the install hassle-free. Keep your block and cylinder cooler with Nitrous Outlet coolant crossovers.
Not Yet Reviewed
$286.99
Nitrous Outlet 860 Performance Hard-Lined LSX Steam Vent Kit utilizes the front and rear steam ports on the passenger and driver side head, allowing water flow through the ports and back to the radiator. This design prevents built up steam pressure which is known to create a rise in cylinder temperatures on number 7 & number 8 cylinders, causing pre-detonation.
Not Yet Reviewed
$255.99
Solve those LS engine cooling issues with a Philadelphia Racing Products coolant crossover plumbing kit. Each kit comes with all of the necessary parts to complete a 4-corner water crossover on your LS engine, including -4 AN hose and aluminum fittings to fully plumb your project just the way you want it.
Not Yet Reviewed
$229.99
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