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Thanks for the comments Cory

December 11 2006 at 6:20 PM
Paul  (no login)

Response to Re: 427 Troubleshooting: Fouled Plugs

Any time someone takes the time to give someone else a hand, it's appreciated. Your info is of interest, especially as our boat motors get older and need some special care. The big Ford called for a F-10 Champion, and since those are no longer available, they've been cross referenced up and down the charts. Here is a thread from our archives. I would be interested in any follow up comments you may have. Depending on the age of the motor and the kind of boating being done, one plug or anther may be the best choice. Our boat motors don't normally turn over 4000 RPM and there are few people out there who run them at that speed (for very long, anyway) because they suck the gas and there's not really a need to race motor homes, if you know what I mean

Most of the time our boats are running between 1500 and 3000 RPM on an uphill grade. At 2600 RPM my 38 is up on a plane and feeling pretty efficient. A little more speed and she is equally happy. Based upon these comments, I'd be interested in any more plug observations you may have.

Regards, all the best!


I want to change the plugs on both engines after 3 years. What does everyone recommend. I took the spark plug numbers listed in the CC 427 manual to my local Auto Zone and got completely blank stares from them. Serves me right. They are not into 40 year old boat engines.



Autolite BTF-3 or Champion F-10 were what was specified for the 427. I am using the NGK A6FS, which I understand is a cross reference to the F-10, which was a pretty generic plug for Ford marine engines "back then".



I work at Autozone Part-time. Most of the other employees won't even try to find a comparable part if you say anything about a Boat. I am usually successful in finding most comparables, but I always give the disclaimer, on what should be marine. Some times I have to break out the Books in the store, to find comparables, most of the other employees don't know they exist. If its not in the computer, they think it doesn't exist.
I went to the Autozone website and put in the Numbers listed by Tom and they cross-referenced to:



DENSO 5014


I believe my store (Serverna Park Md) stocks these, and we are a low volume store. So most Autozones will stock them or be able to get them in 1-2 days. Just give them your existing spark plug number (or Toms listed number) and they can cross reference it.

The Eagles Nest


Excellent research and post, Rob. Taking your lead, I went to the Champion spark plug web site and I typed in the plugs you noted, and that Tom noted.

If you use this site, only type in the numbers, don't put in the name of the manufacturer, such as "Autolite" or "Delco" or any of that.

I ran a couple of the plugs you and Tom noted, and every time the Champion RF10C came up. Therefore this appears to be some good info! Thanks a bunch for the contribution, collaboration like this is great, and it will help a lot of people who have the same questions and needs later!

Regards, Paul

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