Full Flow Elbow Gasket – Fits MerCruiser Dry Joint V-6 & V-8 (Replaces 864547A02, 864547A1)

Full Flow Elbow Gasket – Fits MerCruiser Dry Joint V-6 & V-8 (Replaces 864547A02, 864547A1)

This Full Flow Elbow Gasket is designed for use with MerCruiser Dry Joint Exhaust Manifolds on GM V-6 and V-8 engines, including 4.3L, 5.0L, 5.7L, and 6.2L models from 2002 and newer.

It serves as a direct replacement for MerCruiser part numbers 27-864547A02/864547A02 and 27-864547A1/864547A1, as well as Sierra aftermarket part 18-0721.

• Includes one Full Flow Elbow Gasket
• Compatible with gas fuel type
• Installation requires Dry Joint connection

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For MerCruiser owners, here9s a guide to help you identify your engine9s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Full Flow Elbow Gasket (27-864547A02, 27-864547A1)

Installation Guide

1. Ensure the engine is cool and powered off before installation.
2. Remove the old elbow gasket carefully from the dry joint exhaust manifold and riser connection.
3. Clean the mating surfaces to remove debris and old gasket material.
4. Place the new Full Flow Elbow Gasket in position between the exhaust manifold and riser.
5. Align the gasket mounting holes with the corresponding holes on the manifold and riser.
6. Install mounting bolts and tighten evenly to the manufacturer9s torque specifications.
7. Inspect the installation for proper fit and secure connections.
8. Start the engine and check for exhaust leaks around the gasket area.

Troubleshooting & FAQ

• How do I confirm this gasket fits my engine? Confirm the engine model, year, and dry joint exhaust manifold type. Check compatibility with GM V-6 & V-8 MerCruiser engines 4.3L, 5.0L, 5.7L, or 6.2L from 2002 and newer.
• What are the differences compared to OEM parts? This gasket is an aftermarket replacement built to OEM specifications using comparable-grade materials, but it is not an OEM component.
• How often should I replace this gasket? Replace the gasket whenever there are signs of wear, leakage, or during exhaust manifold servicing as per engine maintenance guidelines.
• What are common signs of gasket failure? Look for exhaust leaks, unusual noises, decreased engine performance, or visible cracks and damage on the gasket.
• OEM vs. Aftermarket? This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
• How fast do you ship and how much does it cost? We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
• What is your warranty and return policy? This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.