Sierra 18-5403 Ignition Rotor for GM 6 and 8 Cylinder Engines with Prestolite Distributors, Replaces Mercury Marine 392-9089

The Sierra 18-5403 is an ignition rotor engineered for GM 6 and 8 cylinder marine engines equipped with Prestolite conventional ignition distributors. The rotor mounts inside the distributor cap and rotates with the distributor shaft, directing the high-voltage spark from the coil to the correct spark plug wire terminal in firing order. A precise, machined exterior finish keeps electrical contact consistent, which supports reliable spark delivery and smoother engine performance during tune-ups or ignition system rebuilds.

This rotor is designed to work with Prestolite distributor numbers IBM-7011, IBM-7013, and IBM-7014A, covering GM 6 cylinder 3.8L engines as well as GM 8 cylinder 305, 350, and 454 cubic inch engines across the model years listed below. It is built as a direct equivalent to the original equipment rotor, meeting or exceeding the specifications of the parts it replaces, so it installs in place of the OEM component without modification. Each Sierra part is backed by Sierra's industry-leading customer satisfaction warranty.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5403
• Product Type: Ignition Rotor
• Compatible Distributors: Prestolite IBM-7011, IBM-7013, IBM-7014A
• Compatible Engines: GM 6 and 8 cylinder engines with Prestolite conventional ignition
• Compatible Model Years: 1976-82, 1983-88, 1984-88 (by engine, see Fitment)
• UPC: 030999319180
• Weight: 0.03 pounds
• Product Dimensions: 5 x 4 x 1.25 inches
• Exterior Finish: Machined

Fitment

• 1984-88, 6 cylinder, 3.8L engine, Distributor No. IBM-7014A
• 1976-82, 8 cylinder, 305, 350, 454 engine, Distributor No. IBM-7011
• 1983-88, 8 cylinder, 305, 350, 454 engine, Distributor No. IBM-7013

Replaces (OEM)

• E65-0013
• 41074
• 41089
• 71060
• 71130
• 9-29203
• 9-29214
• 392-9089
• 392-9089T
• 392-9767
• 9089Q
• FI6900186
• FI6900190
• 3853801
• 982880
• R103004
• 841907
• 855845

Frequently Asked Questions

What engines does the Sierra 18-5403 rotor fit? The 18-5403 fits GM 6 cylinder 3.8L engines and GM 8 cylinder 305, 350, and 454 cubic inch engines that use a Prestolite conventional ignition distributor.

Which distributor numbers is this rotor designed for? This rotor is built for Prestolite distributor numbers IBM-7011, IBM-7013, and IBM-7014A.

What model years does the 18-5403 rotor cover? Coverage depends on the engine: 1984-88 for the 6 cylinder 3.8L engine on distributor IBM-7014A, 1976-82 for the 8 cylinder 305, 350, and 454 engines on distributor IBM-7011, and 1983-88 for those same 8 cylinder engines on distributor IBM-7013.

Is the Sierra 18-5403 a direct replacement for the OEM rotor? Yes, the 18-5403 is designed to meet or exceed the original equipment rotor it replaces and installs in the same position without modification.

What OEM part numbers does the 18-5403 rotor cross-reference? It replaces OEM numbers including Mercury Marine 392-9089, 392-9089T, 392-9767, 9089Q, Crusader 41074, 41089, OMC 982880, Volvo Penta 3853801, 841907, 855845, Pleasurecraft R103004, GLM 71060, 71130, Mallory 9-29203, 9-29214, CDI E65-0013, and Mercruiser FI6900186, FI6900190.

What are the dimensions and weight of this rotor? The 18-5403 measures 5 x 4 x 1.25 inches and weighs 0.03 pounds.

What is the exterior finish on the 18-5403 rotor? The 18-5403 has a machined exterior finish for consistent electrical contact inside the distributor cap.

Does this rotor work with Ford engines? No, the fitment data for the 18-5403 covers GM 6 and 8 cylinder engines only; Ford applications use a different Sierra rotor part number.

Is the Sierra 18-5403 covered under warranty? Yes, the 18-5403 rotor is covered under Sierra's customer satisfaction warranty, the same coverage applied across all Sierra parts.

What function does the 18-5403 rotor perform in the ignition system? It mounts on the distributor shaft and rotates to direct high-voltage spark from the ignition coil to each spark plug wire terminal in the correct firing order.