Availability
Designed just for racecars, Moroso's positive-locking valve cover breathers meet the rules for cars running 7.99 seconds and faster. They rely on threaded collars that mount on the inside of the valve covers, through the standard 1.22 in. opening, to provide secure attachment. They also have internal stainless steel baffling to keep oil and air separated. Jam nuts allow the breathers to be positioned in any way necessary to suit plumbing requirements, and Buna-N gaskets that are resistant to oil, alcohol, and race fuel are used to form an airtight seal. Mounting hardware is included.
( 15 )
$87.99
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$130.99
Moroso one-piece push-in valve cover breathers are designed to drain oil trapped in their foam filter elements back into the valve covers, rather than allow it to drain out of the air vents or get into the air cleaner. These breathers are available in several colors and finishes. They'll fit all Moroso valve covers, as well as any other covers with a 1.22 in. hole. Some have 90 degree nipples to feed vapor into the air cleaner, and an installation grommet is included.
( 36 )
$16.99
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$53.99
Help your engine breathe better with Moroso valve cover filtered breathers. They are available in half-hooded styles for extra protection from dirt and debris, and non-hooded designs for when that added shielding isn't necessary. Both styles provide serious protection against dirt and airborne debris without restricting airflow. These breathers also come in either a push-in or clamp-on style; both are cleanable and reusable.
( 21 )
$23.99
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$102.99
Moroso PCV grommets with integral baffles are designed for those using extra-tall valve covers without the integral oil control baffles. The special oil-resistant design keeps oil out of the PCV valve. They'll work with all GM PCV valves and will fit any valve cover with a 1.22 in. diameter hole.
( 20 )
$9.99
Moroso diecast aluminum valve covers are made with the finest materials available. Their diecasting process is extremely precise and results in a blemish-free surface. The gasket rails are thick for superior gasket sealing, and the covers' thin-wall design makes them about half the weight of other cast versions. They're available with or without filtered breathers in black epoxy, polished, or natural finishes. They feature a variety of breather locations, from stock to Circle Track-oriented configurations. Most applications include two breather/filler cap grommets and one PCV grommet. Circle Track and other racing versions feature welded-on breather tubes in a variety of locations; most include breathers.
( 24 )
$175.99
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$367.99
In racing, a leaking valve cover caused by a fastener shaking loose from vibration could result in a disaster. Moroso Oval Track valve cover stud kits are designed primarily for Oval Track racers using Moroso cast aluminum valve covers. The kits have nylon insert locknuts to make sure those fasteners won't come loose.
( 21 )
$16.99
Racers who use the latest cylinder heads or want a unique look for their engines—or both—can now find quality, lightweight aluminum valve covers at an affordable price. These Moroso fabricated aluminum valve covers have thick billet rails for superior gasket sealing and resistance to warping. They mount through tubes welded directly to the valve covers—to help maintain gasket-rail flatness and prevent leaks. The covers feature a tall design that will clear all rocker combinations, as well as stud girdles. Some models have built-in oilers to keep valve springs cooler in oval track racing. Order the model designed for your vehicle and engine application.
( 24 )
$445.99
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$1,426.99
Moroso no-weld oil fill cap kits provide an easy way of adding an oil fill to a valve cover without welding. And, since no welding is required, there is no possibility of heat damage. They're constructed from 6061-T6 billet aluminum with an O-ring and a finger grip cap with a black anodized finish and the Moroso logo.
( 6 )
$57.74
These stamped steel valve covers from Moroso are available in your choice of short or tall designs with a variety of breather locations. They are designed to fit everything from stock to Circle Track-oriented configurations. They're manufactured from high-quality steel with either a durable zinc plated finish or a 3-step chroming process, which guarantees the highest and longest-lasting shine possible. Most applications include two breather/filler cap grommets and one PCV grommet. Circle Track and other racing versions feature welded-on breather tubes in a variety of locations, with most including breathers.
( 38 )
$81.99
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$197.99
Moroso breather grommets with integral baffles are designed for use with valve covers that do not have an oil control baffle system. They are made from oil-resistant rubber and will fit into any valve cover with a 1.22 in. diameter hole, replacing the OEM-style grommets. The built-in baffles provide oil control. Note: These breather grommets will not clear stud girdles.
( 28 )
$10.99
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$11.39
These valve cover stud kits from Moroso are designed to prevent valve covers from vibrating loose in competition. They're available in several styles to cover various applications.
( 15 )
$15.99
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$84.99
Moroso crankcase evacuation systems reduce crankcase pressure throughout the entire rpm range for increased piston ring seal, reduced intake charge contamination, and fewer oil leaks. They have been track and dyno-tested to produce significant increases in engine performance.
( 9 )
$232.99
Moroso 14 gauge aluminum valve cover breather baffles are designed to mount inside your Moroso valve covers under the breather hole. They'll keep oil from getting into the breather, which will increase the breather's life. They include all necessary mounting hardware.
( 10 )
$14.99
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$51.99
Moroso PCV grommets are for the street enthusiast using Moroso valve covers and wishing to install a positive crankcase ventilation system. The grommets work with all GM PCV valves and will fit all valve covers with a 1.22 in. hole.
( 16 )
$10.99
Control the oil with Moroso valve cover baffle kits. These no-weld kits provide an easy way of adding a female AN fitting to steel or aluminum valve cover. And since there isn't any welding required, there is not the possibility of heat damage to the chrome or powdercoat finishes of your valve covers. Moroso valve cover baffle kits include hardware and O-ring, and are available in -8AN, -10AN, and -12AN female fittings.
Not Yet Reviewed
$44.99
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$51.99
These Moroso extra long valve cover wing nuts are available in chrome plated steel or your choice of powdercoated or anodized aluminum colors. They include matching studs to eliminate gaskets alignment problems and to speed installation.
( 18 )
$31.99
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$52.99
Moroso weld-in filtered breather kits contain two 1 3/8 in. O.D. aluminum breather tubes with internal baffling, two half-hooded filtered breathers, and two stainless steel hose clamps. Although they're specifically designed to weld onto Moroso aluminum valve covers, they can be adapted to fit other brands of aluminum covers as well.
( 2 )
$74.99
Moroso breather/filler cap grommets are great for replacing your worn and dirty grommets. These oil-resistant rubber components are sold two per package and will fit all valve covers with a 1.22 in. diameter hole.
( 10 )
$11.99
Moroso hold-down tabs spread the fastener load over a larger area of the valve cover flange to eliminate flange distortion and subsequent oil leakage. These tabs are available in several different finishes for a variety of applications.
( 24 )
$20.99
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$31.99
Moroso weld-on filler cap kits are universal to "fill" many needs. They can be used on power steering tanks, radiator overflow tanks, rear-ends, and valve covers—as well as other locations to replenish fluid or to serve as inspection ports. These kits include either a steel or aluminum weld-in bung with O-ring for leak-free sealing, and an aluminum cap with the Moroso logo (plain cap also available).
( 9 )
$51.99
Moroso billet aluminum valve covers are CNC-machined from a billet aluminum bar to make them lightweight without sacrificing strength. Their airtight sealing allows the engine to pull greater vacuum for improved ring seal and power. The covers are available plain or with the Moroso logo, natural or black anodized—and mount with either a centerbolt or perimeter bolts. Order the pair designed for fitment with your vehicle and engine application.
( 2 )
$527.99
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$1,441.99
Moroso oil filler caps feature a push-in design for applications requiring a sealing-type filler plug. Designed to fit all Moroso and OE valve covers with the same size hole, these caps sport a classy chrome finish with an engraved Moroso logo.
( 4 )
$15.99
Moroso chrome valve cover acorn nuts add a decorative touch to engines in cases where long valve cover wing nuts are impractical. They fit a variety of valve covers, and have a flashy chrome finish.
( 2 )
$40.99
Moroso Copo valve cover breather kits allow push-in installation of billet breather adapter assembly into valve covers with 1.22 in. through holes. This permits crankcase ventilation from valve covers to externally mounted breather tank. Moroso breathers and adapters are machined from billet aluminum, and each kit includes grommets and O-rings. Copo valve cover breather kits are for use with 3/4 in. I.D. hose (not included).
( 1 )
$189.99
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$235.99
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