Wet-Joint Manifold Exhaust Hose Bellows Kit for MerCruiser 454/502 Wet-Joint — 27-863726

GH MARINE / BELLOWS & RELATED PARTS

About this part

Wet-joint manifold exhaust hose bellows repair kit referenced to MerCruiser 27-863726 and 27-860233 for servicing the exhaust hose-bellows connection on Model 330–370 GM 454/502 CID big-block V8 applications from 1981 and up.

Designed for 4-inch wet-joint exhaust configurations; confirm the exhaust joint style, cooling setup, and required gasket version before ordering.

Match the application

This kit applies to the MerCruiser big-block V8 wet-joint exhaust configuration listed below. Match the engine model, displacement, 4-inch designation, and wet-joint exhaust design before starting service.

• MerCruiser · Model 330-370 (GM 454/502 CID V8 Big Block)

  Year: 1981 and up

  For 4-inch wet-joint manifold exhaust hose bellows connections on GM 454 or 502 CID big-block V8 applications. Match the required gasket version and cooling configuration before ordering.

  Application match

Numbers to compare

Compare the primary OEM and cross-reference numbers below against your existing manifold exhaust components and service parts list. Gasket and individual component references are listed for cross-checking your cooling and joint configuration and do not by themselves establish the exact package contents.

Technical details

Supplied contents

• Wet-joint manifold exhaust hose bellows repair kit

Workshop sequence

General workshop guidance only; use the service procedure for your exact drive or engine configuration.

1. Allow the engine and exhaust system to cool completely, isolate the battery, and prevent water entry through the exhaust system before disconnecting exhaust components.
2. Verify that the engine uses the 4-inch wet-joint manifold and riser arrangement and check the cooling water passage layout before disassembly.
3. Remove the worn exhaust hose bellows and clean the mating necks and sealing surfaces on the manifold and exhaust elbow or riser, checking for corrosion, pitting, or distortion.
4. Fit the replacement components in the orientation specified by your MerCruiser service manual, ensuring the hose bellows sits evenly on the connections without twisting or kinking.

About GH Marine

GH Marine focuses on bellows and related marine service parts. Compare the application details, reference numbers and supplied contents together to select the part for your repair.

Delivery information

Estimated delivery: 7–15 calendar days.

Help with your order

For application questions, have your drive or engine identification and required part number ready.

Contact GH Marine / fitment help · Returns policy