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Mallory V8 Flat Cap Tune-Up Kit | Sierra 18-5272
Complete engine maintenance in one package with the Mallory V8 Flat Cap Tune-Up Kit. This comprehensive solution delivers everything needed to keep your V8 running at peak performance. Engineered for reliability and ease of installation, it's the smart choice for boaters who demand dependable power and smooth operation on the water.
Keeping a classic marine engine running smoothly requires precision-engineered components. Therefore, the Mallory V8 Flat Cap Tune-Up Kit is a vital investment for your boat. This kit, also known as the Sierra 18-5272, is specifically designed for V8 engines with single-point distributors. Because marine environments are unforgiving, specialized ignition parts are essential for reliability. By choosing this "crab style" flat cap kit, you ensure your ignition system stays dry and functional.
First of all, this kit is manufactured to meet or exceed original equipment standards. Consequently, every component fits perfectly without the need for frustrating modifications. The kit includes a high-dielectric strength distributor cap and a precision-balanced rotor. In addition, you receive a premium contact point set and a heavy-duty condenser. Furthermore, these parts are engineered to withstand the high-heat cycles typical of inboard marine engines.
Worn points and a corroded cap are the most common causes of engine misfires. However, installing the United Marine 1-102 equivalent or the Sierra 18-5272 can instantly fix these issues. Since the flat cap design is compact, it is often found in tight engine compartments. Moreover, fresh brass terminals in the cap ensure a consistent path for the electrical spark. As a result, your engine will start faster and idle much more consistently at the dock.
Convenience is a major benefit when you are performing seasonal maintenance. Instead of hunting for individual parts, this kit provides everything you need in one package. Specifically, it replaces common Mallory part numbers like 9-29312. Since all components are replaced together, you can be sure the entire ignition system is synchronized. Thus, you save time and money while gaining peace of mind for your next trip.
Standard automotive parts simply cannot handle the moisture and salt of the marine world. Fortunately, Sierra uses impact-resistant materials to prevent the distributor cap from cracking. Likewise, the points are designed to resist pitting and burning over long periods of use. Ultimately, this proactive maintenance protects your engine from unexpected breakdowns. Therefore, you should always keep a spare Sierra 18-5272 kit on board for emergencies.
This kit fits Mallory V8 flat cap, side terminal, single-point distributors. It is commonly found on older Mercruiser, OMC, and Crusader inboard engines.
The 18-5272 kit includes the distributor cap, the rotor, the contact point set, and the condenser.
Yes, it certainly is. Because it is a marine-grade product, it features corrosion-resistant terminals and a non-vented cap for safety.
Check the spark plug wire orientation on your distributor. If the wires come out of the sides of a low-profile cap, it is likely a flat cap or "crab style" unit.

Would have been 5 stars but, I did not receive a promotional sticker with my $2000 drive unit. Just kidding, everything was great!
Great company to work with!
Ordered a Piranha Propellers Complete A-Series 4 Blade Propeller from Macomb Marine Parts and even though we’re international, it arrived in just over a week — fast and reliable service. The propeller itself is a real lifesaver. We had the same model before, and after hitting a rock that damaged two blades, we were able to swap them right on the water and make it back to the marina without issue — something you simply can’t do with a regular aluminum prop. For peace of mind we decided to buy a complete new set (hub and blades) since an impact like that could cause hidden damage, but the system really proved its worth.
3 in. Exhaust Elbow | Pleasurecraft R029001
Excellent part.
I couldn’t find a Piranha propeller dealer near me in Canada but found Macomb Marine Parts who could deliver to me. The order process was smooth and I was even contacted via email for clarification regarding blade shape and they were very helpful in choosing the best shape for my purposes.
I can’t comment on the prop’s performance yet as we haven’t had the boat in the water yet.
Perfect replacement. thank you
Perfect replacement
Perfect match to the original Chris Craft blue. Competitive price and delivery was quick
Great Product, easy to install, work well
Obtaining magnesium anodes to install on the OMC Cobra (SX-C) sterndrive, for fresh water use. Received the anode within a week of ordering the part, which is not going to be installed until Spring.
Black Liquid Electrical Tape - 4 oz. | Star Brite 084104B
As described
Very Happy!! Just what I needed!!
Outdrive spent 4 months docked in salt water with no visible rust on the stainless steel braided hoses
Would have been 5 stars but, I did not receive a promotional sticker with my $2000 drive unit. Just kidding, everything was great!
Great company to work with!
Ordered a Piranha Propellers Complete A-Series 4 Blade Propeller from Macomb Marine Parts and even though we’re international, it arrived in just over a week — fast and reliable service. The propeller itself is a real lifesaver. We had the same model before, and after hitting a rock that damaged two blades, we were able to swap them right on the water and make it back to the marina without issue — something you simply can’t do with a regular aluminum prop. For peace of mind we decided to buy a complete new set (hub and blades) since an impact like that could cause hidden damage, but the system really proved its worth.
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