This Sierra manifold conversion kit replaces the original one-piece "batwing" marine manifolds (807293A2, 807294A3, 807293C, 807294C) that came on some 1996 and up MerCruiser 4.3L (GM/Chevy) V6 marine gas engines. It can also replace regular two-piece exhaust systems that utilized the same manifolds, risers, and elbows. Be sure to check the cross reference below.

Each purchase is for one kit to do one engine, and includes the necessary gaskets, clamps, and hardware. Note: Riser gaskets are the standard 2-slot style for typical raw-water cooled setups. If you require 4-slot or block-off, please contact us ahead of time.

Kits Contents

• Qty 2: 18-1952-1 Manifolds (Includes 18-2909 manifold gaskets, 18-0897 riser gaskets, and 18-4224 drains)
• Qty 2: 18-1976-2 Risers
• Qty 2: 18-2748 Round Bellows (Upper, connects risers and elbows)
• Qty 2: HGE 4478 Elbows
• Qty 2: 18-2746 Oval Bellows (Lower, connects elbows to original Y-pipe)

Y-Pipe Note: If your lower Y-pipe has a 13" circumference, you will need Sierra 18-2770 bellows rather than 18-2746. Please measure before ordering and contact us for help.

Shipping Note: This kit ships in multiple boxes. When you receive the tracking number, track it on the carrier's website to see the individal boxes. For standard/ground shipments, they may arrive on different days.

Cross Reference	Part Number
MerCruiser	Manifold: 807293A2, 807294A3, 807293C, 807294C, 99745, 99746, 99746A8, 99746A17, Riser: 44354, 44354A3, 44354A9, 44354A10, 44354A13, 807988, 807988A2, 807988A3, 807914A1, Elbow: 14478T01
Osco	Manifold: 9745, Riser: 4354
Barr Marine	Manifold: MC-1-99746, Riser: MC-20-44354, Elbow: MC-20-14478
Sierra Marine	Manifold: 18-1952-1, Riser: 18-1976-1
HGE	Manifold: 9746, Riser: 4354, Elbow: 4478
Aqua Power	Manifold: 5505, Riser: 5706
GLM Products	Manifold: 51220, Riser: 51140

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