Mercruiser 7.4 454 & 502 Riser Elbows
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Mercury Marine / Quicksilver$224.92 $192.79OEM MerCruiser 4" E-Coated 7 Degree Riser/Elbow 807988Q03 Fits MerCruiser GM V6 & V8 engines with center rise outlet exhaust manifold (approx 2002 & older) Replaces OEM#:807988A2 , 807988q03, 807988-c, 807988A03, 807988A 2, 807988A2,...$224.92 $192.79
Sierra$263.29 $250.99Sierra MerCruiser 4 inch Exhaust Riser Elbow For most MerCruiser engines V6 and V8 ( 4.3 5.0 5.7 6.2 7.4 ) Applications 7" (4" O.D. Riser) Comes as shown in the pictures with bolts and gaskets...$263.29 $250.99
Mercury Marine / Quicksilver$334.75 $286.93OEM MerCruiser 4" Ceramic Coated Riser/Elbow 807988A03 Exhaust elbow 807988A03 is for use on V-6 and V-8 MerCruiser stern drive or inboard engines made by General Motors having a center rise outlet exhaust manifold (model year 2002 and older). It...$334.75 $286.93
Sierra$312.09 $214.12Sierra replacement 3" Exhaust elbow for MerCruiser MerCruiser 175-205 GM 229/262 CID V6 (1983+) MerCruiser 200-320 GM 305/350/377 CID V8 Small Block (1983+) MerCruiser 330-370 GM 454/502 CID V8 Big Block (1981+) Comparable Part...$312.09 $214.12
7.4 454 & 502 Riser Elbows
Get the parts you need to keep your boat’s engine running smoothly with Mercruiser 7.4 454 & 502 Riser Elbows from NuWave Marine. The Mercruiser 502 riser elbow performs two important functions: it prevents cooling water from entering the exhaust manifold and directs the water out of the exhaust system. When replacing a Mercruiser exhaust elbow riser, it's advisable to replace the gasket sandwiched between the riser and manifold.
Mercruiser 7.4 riser elbow
The elbow riser and exhaust manifold continually expand and contract with heat. As a result, the gaskets will eventually fail, and water will start leaking into the exhaust chamber. Water leaks can adversely affect the engine's pistons or create a hydro lock. NuWave Marine recommends removing and inspecting the Mercruiser exhaust system regularly. You should inspect after the first two years and perform subsequent annual inspections after.
A wet joint system will last for about five years in salt water, while a dry joint system will last two or three years more. Freshwater application is more forgiving with a 30-50% increased lifespan. Replace your Mercruiser 502 elbow riser every 2-3 years to get the most out of your engine. Checking for rust around the gaskets and the exhaust ports will tell you if your Mercruiser exhaust system needs a riser elbow replacement. These regular inspections will also help catch any damage and corrosion around the manifold, gaskets, spacers, and Y-pipes parts.
Mercruiser 454 riser elbow
Direct replacements for your Mercruiser 502 and 454 riser elbow are available. Our top-quality OEM Mercruiser 7.4-454-502 exhaust parts are sold individually or as part of a kit containing riser elbows, studs, gaskets, and bolts.
Put Your Trust in Premium Parts
At NuWave Marine, we believe great engine performance is possible with premium parts. We have served the boating community with quality OEM and aftermarket replacement parts for over forty years. Contact us today for help finding the right replacement part for your marine engine.