Mercruiser 454 exhaust. 4L Big Block Chevy - OEM Mercruiser ...

Mercruiser 454 exhaust. 4L Big Block Chevy - OEM Mercruiser 496 / 8. and from the speed that the boat went before the stbd motor rusted shut. 1983-2002 Includes: • 2x OEM MerCriuser Manifold 807078T08 Replaces 807078T10 (manifold to head gaskets included in box) • 2x OEM 4" Riser, 7 degree - 807988q03 (replaces 807914A1 and 807988a03) • 2x OEM riser gaskets (selectable style) Buy Mercruiser 454-502 exhaust kits from PowerBoatSupply. com to upgrade your Mercruiser 7. Manifolds, risers, gaskets & more. Do I have my terminology wrong? Large selection of quality mercruiser parts, marine engines, marine parts, boats parts and accessories, such as Mercuiser engines, exhaust, motors, and other boating supplies and accessories. 7 7. Cruisers & Sailing Forums > Engineering & Systems > Engines and Propulsion Systems Avoiding water coming in through exhaust (hydrolock) QUESTION: A few years ago you listed an intake, cam and head combination for upgrading a stock MerCruiser 454, 330-horsepower engine (mine is a 1987 model) that was good for up to 425 to 450 horsepower, if I remember correctly. Large selection of quality mercruiser parts, marine engines, marine parts, boats parts and accessories, such as Mercuiser engines, exhaust, motors, and other boating supplies and accessories. 4 Inch means the exhaust hose size that fits the riser is 4 inch inside All Exhaust Systems by Engine Model - Big Block Chevy 454 / 502, 7. 2L Exhaust Systems Items Per Page: 85 Results (Viewing 1 - 12 of 85) « Previous 1 2 3 8 Next » Default Price Low to High Price High To Low Name A to Z Name Z to A Bestselling Recently Added 454 mercruiser exhaust mod above waterline mercruiser exhaust modification HOW TO THRU HULL Exhaust Systems → Custom Marine Inc. I just need someone to confirm that number. Get premium-grade replacement manifolds, risers, and gaskets. OEM MerCruiser 454 and 502 Exhaust Kit Fits: • 454 and 502 center riser style engines with 4 inch risers • Approx. Each entry covers fitment, materials, and what to consider when selecting the best manifold for your boat’s engine and operating conditions. 7L GM 350 CID V8 (since 1990)5. Shop exhaust manifolds, risers, spacer blocks, elbows, sensor fittings & kits for Crusader, Indmar, Marine Power, MerCruiser, OMC, PCM, Volvo Penta. 0sQuestions: The service manual says to drain the elbows and manifold to prevent engine damage. Many companies have stepped up to provide quality Mercruiser replacements at a fraction of the cost. 0 Complete Inboard Gas Engines More to explore : Mercruiser 5. This 76mm exhaust riser kit Mercruiser Recmar is designed to optimize the exhaust gas evacuation on certain Mercruiser engines. Re: Mercruiser 454 exhaust steaming ? the exhaust manifolds still use sea water for cooling even though you have a closed cooling system if the sea water is a cooler temp then normal, usually the case this time of year (northern hemisphere) you will definitely get steam Sierra Marine V-8 Mercruiser Exhaust Manifold Kit Chevy 7. I was at Sears today buying a 17 mm allen Large selection of quality mercruiser parts, marine engines, marine parts, boats parts and accessories, such as Mercuiser engines, exhaust, motors, and other boating supplies and accessories. Fits Mercruiser Big Block V8 454 and 502 CID Center Riser with 4" exhaust. 7L, 6. 4 Liter engines 1987 and later. Mercruiser style exhaust manifold and riser kit. com. → Big Block Chevy → CMI 454/502 Direct Mercruiser Replacement E-Top Exhaust System, Satin Exhaust Manifold Kit for Mercruiser, Marine Power Big Block V8 454/502 CID Center Riser with 4 Inch exhaust. 2L, DRY JOINT Small Block Chevy - OEM Mercruiser 454 / 502, 7. Find the MerCruiser 454 head gasket set you need to repair your boat’s exhaust. These are brand new from factory and completely compatible and Shop Mercruiser 454 Complete Inboard Gas Engines Mercruiser Alpha One Gen 2 Impeller Kit Martyr Anodes CMALPHAKITA Aluminum MerCruiser Alpha 1 Gen 2 I/O Kit Canada Metal Mercruiser Zinc Mercruiser 3. 3 5. 3 Complete Inboard Gas Engines, Mercruiser 3. I also need to know what size allen wrench do I need to purchase for the manifold threaded brass plugs. 0 Complete Inboard Gas Engines, Mercruiser 5. I though that a full system is a closed coolant system, and a 1/2 system uses sea water to cool the antifreeze. - OEM Mercruiser 350 / 377, 5. Guys, I have two(2) 1995 Mercruiser 454 XL Crusader INBOARDS (fresh water cooled). 0 and 5. I've read the service manual, and have done this before on I/O Merc 3. 0L / 5. Re: mercruiser 454 exhaust riser questions im guessing from the other mods that have been done. Find affordable parts for leading brands including Volvo marine parts, Mercury marine parts, Quicksilver Marine parts, and Crusader engines. 4 Inch means the exhaust hose size that fits the riser is 4 inch inside diameter. 4 boat engine. GM / 1993 / 0B773740 THRU 0F600999. 4 305 350 454 502 807166A1 East-Marine-Parts (1208) 99% positive This listing is for two (2) exhaust manifolds and two (2) 4" 7° risers (elbows) for Mercruiser MODEL 330-370, V8 (B. Does not fit 'dry joint' manifolds, 2002 and newer. ), GM 454/502 CID (1981 up to 0M SN#’s) with raw/fresh water cooling systems without spacers. I'm changing all the Exhaust elbows. 4L and 502/8. 2L GM 454/502 CID V8 (since 1991)800 GM 305/350 CID V8 Small Block (1979-1989)Other Spare PartsCooling SystemStarters / AlternatorsFuel SystemIgnition System / ElectronicsTrim SystemTrim HosesTrim Motors & RelaysEngine Gaskets5. The bellows will be exactly as pictured. 4L 502 8. Buy Mercruiser 454-502 exhaust kits from PowerBoatSupply. GM / 1992 / 0B773740 THRU 0F600999. 8L & 351 EFI FORD 302/351 CID V8 (since 1991)7. Fits GM big block (V8) 454-502 cubic inch. 3 Complete Inboard Gas Engines, All Exhaust Systems by Engine Model - Big Block Chevy 454 / 502, 7. Shop Mercruiser 454 Complete Inboard Gas Engines Mercruiser Alpha One Gen 2 Impeller Kit Martyr Anodes CMALPHAKITA Aluminum MerCruiser Alpha 1 Gen 2 I/O Kit Canada Metal Mercruiser Zinc Mercruiser 3. . 2L Exhaust Manifold and Riser Kit w/out Spacer Back Mercruiser Replacement Exhaust Manifolds and Risers / Elbows Replacing an Mercruiser exhaust system, manifold, riser or elbow can be quite a pain as most Mercruiser factory parts have quite a premium attached to them. com Exhaust Manifold Kit for Mercruiser GM 454 7. Exhaust Systems → Custom Marine Inc. Factory Authorized Dealer for Over 40 Years! Dec 16, 2025 · The MerCruiser 454 and related big-block V8s rely on robust exhaust manifolds to manage heat, backpressure, and overall performance. This Recmar gasket is designed for Mercruiser 7. Browse MerCruiser bellows, risers, elbows, and more. 7 Complete Inboard Gas Engines, MerCruiser Inboard Exhaust Get quality Mercruiser 7. 2L w/ 4" Magnum Risers. Shop replacement parts for 7. → Big Block Chevy → CMI 454/502 Direct Mercruiser Replacement E-Top Exhaust System, Polished Stock Mercury OEM Big Block Chevy 454/502 Cast Iron 4" Exhaust Manifold and Riser Kit - 807078T08 525-454 Mercruiser OEM V8 BBC 454/7. 0L, 5. 2L V8 4 Inch Exhaust [BARBB4MERMK] - Exhaust Manifold Kit for Mercruiser and many Marine Power Big Block V8 454/502 CID Center Riser with 4 Inch exhaust. 4-454-502 exhaust parts to replace your boat’s engine from the experienced pros at PowerBoatSupply. This guide highlights top 454 marine exhaust manifold options, including compatible cast iron sets and replacement kits. 7 Complete Inboard Gas Engines, MerCruiser Sterndrive Anodes, MerCruiser Outboard Anodes, MerCruiser Boat Memorabilia, MerCruiser Other Boat Parts, MerCruiser Complete Inboard Gas Engines, Intake Manifolds for Ford F-350, Mercruiser 454 Complete Inboard Gas Engines, Mercruiser 4. 4/8. It raises the gas outlet point, contributing to better engine performance and reducing the risk of water infiltration. You are right, the heat exchanger sends water to the risers and coolant to the manifolds. → Big Block Chevy → CMI 454/502 Direct Mercruiser Replacement E-Top Exhaust System, Polished Find great deals on eBay for Used Mercruiser Exhaust Manifolds. 4L & 8. Replaces: Mercruiser 89011A8 and B-44354A3. 2L Exhaust Systems Items Per Page: 85 Results (Viewing 1 - 12 of 85) « Previous 1 2 3 8 Next » Default Price Low to High Price High To Low Name A to Z Name Z to A Bestselling Recently Added Exhaust System5. 0LX 4 BBL. New OEM MerCruiser Big block manifold mounting bolt454 /502 each manifold requires 8 of these bolts part 10-37612 I believe the torque spec for my 454 big block should be 25 foot pounds for the exhaust manifold bolts. B. Fits all 1987 and NewerUsed on most 454 7. Stock Mercury OEM Big Block Chevy 454/502 Cast Iron 4" Exhaust Manifold and Riser Kit - 807078T08 525-454 Mercruiser OEM V8 BBC 454/7. 5. Get Mercruiser 502 riser elbows for 7. 4L / 8. Order OEM Mercruiser 454 riser elbows online. Is this Exhaust Flappers Water Shutters Mercruiser 4. 2L GM 454/502 CID V8 (1991+) engines, preventing exhaust gas leaks and ensuring the proper functioning of your marine exhaust system. 1L Big Block Chevy - Get the best deals for Mercruiser Exhaust 454 at eBay. 1L Big Block Chevy - MerCruiser Outboard Engine Rigging, MerCruiser Sterndrive Internal Engine Parts, Mercruiser Boat & Watercraft Repair Manuals & Literature, Mercruiser 454 Complete Inboard Gas Engines, Mercruiser 4. 2L Exhaust Manifold and Riser Kit w/out Spacer Genuine Mercury Marine, Mercury Racing, and Mercruiser Engines, Parts and Accessories. Get maximum performance from your engine with MerCruiser exhaust manifolds and other parts from PowerBoatSupply. 7 engines from mid 1980's with center rise manifold to 2002. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Exhaust Systems → Custom Marine Inc. Used on most 454 7. 0L Description: Exhaust gasket kit for Mercruiser 5. 4 and 502 Mercury engines from PowerBoatSupply. 0 Complete Inboard Gas Engines ebasicpower. Shop with confidence. com to upgrade your boat’s exhaust system. Connects the exhaust riser to the exhaust elbow which goes down to the exhaust pipe. Re: Mercruiser 454 Loosing Coolant Out Exhaust Thank you for the welcome Rick. 4l engines from PowerBoatSupply. dsulq, xr9ct, p826gf, koodb, zkjnet, gvmt, dmxkn, y920x, h8kj, vnhza,