27-863726 Full-Flow Exhaust Elbow Gasket (2-Pack) for MerCruiser V6 V8

SERDAMARINE / MARINE EXHAUST PARTS

Full-Flow Exhaust Elbow Gasket Pack (2 Pieces) for MerCruiser Wet-Joint and Dry-Joint Alternative Connections

This two-piece full-flow (open) gasket pack seals the exhaust manifold, elbow, and spacer connections on specified MerCruiser GM V6, V8 small-block, and V8 big-block applications, referenced to MerCruiser 27-863726. It fits listed wet-joint exhaust assemblies within their original year and serial-number limits, as well as GM V6 and V8 small-block engines (0M serial numbers and up) equipped with a Dry Joint “Alternative” replacement system.

Configuration & Specifications

Engine Applications

This full-flow gasket is used on the MerCruiser GM V6 and V8 manifold, elbow, and spacer applications below. Verify your engine serial-number range, joint style, and water-passage layout against the existing exhaust hardware; for 0M-and-up small-block engines, confirm that the Dry Joint “Alternative” wet-joint replacement system is installed.

• MerCruiser Model 175–205 (V6, GM 229 / 262 CID) — Years: 1983 through 0M serial numbers. Joint configuration: Wet Joint. Flow configuration: Full Flow (open). Position: Exhaust manifold, elbow, and spacer connection. Fits when specified
• MerCruiser Model 200–320 (V8 Small Block, GM 305 / 350 / 377 CID) — Years: 1983 through 0M serial numbers. Joint configuration: Wet Joint. Flow configuration: Full Flow (open). Position: Exhaust manifold, elbow, and spacer connection. Fits when specified
• MerCruiser Model 330–370 (V8 Big Block, GM 454 / 502 CID) — Years: 1981 & up. Joint configuration: Wet Joint. Flow configuration: Full Flow (open). Position: Exhaust manifold, elbow, and spacer connection. Fits when specified
• MerCruiser GM V6 / V8 Small Block — Dry Joint “Alternative” System — Serial range: 0M serial numbers & up. Joint configuration: Dry Joint “Alternative” wet-joint replacement system only. Flow configuration: Full Flow (open). Position: Exhaust manifold and spacer connection. Fits when specified

Application Check Required

• Mercury Mariner / MerCruiser — 200 (DFI / EFI), 200 PRO XS, 225 (EFI / DFI), 225 SEAPRO, 250 (DFI / EFI), 3.0L — These model designations appear in supplemental product notes without joint-configuration or manifold/spacer details. Match by OEM part number and physical gasket port layout before selecting for these engines. Confirm application

Additional model-specific applications

• MerCruiser MODEL 175-205, GM V6, 229 CID, WET JOINT; 1983 — 0M SN#’s.
• MerCruiser MODEL 175-205, GM V6, 262 CID, WET JOINT; 1983 — 0M SN#’s.
• MerCruiser MODEL 200-320, GM V8 Small Block, 305 CID, WET JOINT; 1983 — 0M SN#’s.
• MerCruiser MODEL 200-320, GM V8 Small Block, 350 CID, WET JOINT; 1983 — 0M SN#’s.
• MerCruiser MODEL 200-320, GM V8 Small Block, 377 CID, WET JOINT; 1983 — 0M SN#’s.
• MerCruiser MODEL 330-370, GM V8 Big Block, 454 CID, WET JOINT; from 1981 onward, ending year not specified.
• MerCruiser MODEL 330-370, GM V8 Big Block, 502 CID, WET JOINT; from 1981 onward, ending year not specified.
• MerCruiser GM V6, Dry Joint “Alternative” replacement system using wet-joint manifold and spacer connections; 0M SN#’s & UP.
• MerCruiser GM V8 Small Block, Dry Joint “Alternative” replacement system using wet-joint manifold and spacer connections; 0M SN#’s & UP.

Reference Numbers

The numbers below are provided for part identification and cross-reference. They do not imply that this aftermarket gasket pack is manufactured by the referenced OEM brands, nor do they make different water-passage configurations interchangeable on the same engine.

Supplied Parts

• 2 × Full-flow exhaust elbow / manifold / spacer gaskets

Service & Installation Notes

General service guidance only. Use the service manual for your exact engine and exhaust configuration.

1. Shut down the engine, disconnect the battery to prevent accidental cranking, and allow the exhaust manifolds, elbows, and spacers to cool completely before disassembly.
2. Support heavy exhaust elbows and spacers during removal so hardware and cast mating surfaces are not strained or damaged.
3. Clean old gasket material from the manifold, spacer, and elbow sealing faces, and inspect the surfaces for corrosion, pitting, or warpage without gouging the metal.
4. Compare the new full-flow gasket ports directly against the removed gasket and the mating water passages. Do not substitute a full-flow (open) gasket in a joint that requires a restrictor or block-off gasket.
5. Reassemble and tighten fasteners according to the sequence and specifications in your engine service manual. After installation, inspect the exhaust and cooling joint for exhaust or water leaks under normal water supply; shut down immediately and inspect if any leakage or abnormal temperature occurs.

The Serdamarine Approach

Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.

Questions Before Replacement