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Apparently there is no spark plug listed in the Baxter's Trailblazer/Chief online parts book (maybe they are on the missing pages - there appears to be no page 40 , 41). The plugs that are in it (AC S44XL) cross over to the same two plugs recommended for an Interceptor - Champion N5C and NGK B6ES. Is it safe to use these?
The Trailblazer workshop manual (Hitchcock's) show only magneto ignition, not the distributor. The Super Meteor-Constellation manual shows a distributor and recommends 0.015" points gap. But no timing procedure. The magneto instructions suggest the points should open at 3/8" inch BTDC (with cam fully advanced). Will this be correct for the distributor ignition Chief? In actual testing the distributor timing was spot on (as near as I could tell with a marked rod down the spark plug hole).
I am working through all these maintenance and adjustments and hope to have it running before much longer.


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Hi Al,
IMHO, you'll be OK going with the specs for the SM Connie. The timing should be the same regardless of how the spark is made ?
If it was me, I would go with a B7ES which is slightly colder and see how that works.
Let us know how things go.


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Thanks Craig. I'll order some plugs today.


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You two are now the Chief authorities, meaning we will be coming to you when we find our own Chiefs.

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I've collected a lot of information, documents, articles and photos. I don't think that will make me an authority at this point in the game. I might be able to help someone - if I can remember where I put the info!


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Al, I think you're way ahead of me. At least your Chief takes two of the same sized plugs !
My recent acquisition had a Champion N-5 in one head and a Champion F-14Y in the other.
The F-14Y is apparently for a Ford truck or industrial/farm application....go figure !


They say every dog has his day..
Trouble is, nobody tells the dog which day it is !

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Originally Posted by oilyamerican
<SNIP>
My recent acquisition had a Champion N-5 in one head and a Champion F-14Y in the other.
The F-14Y is apparently for a Ford truck or industrial/farm application....go figure !
Sad the things you see sometimes. That F-14 plug has an 18mm thread with a tapered seat ... and only 0.40" reach. Someone must have been super-desperate doing that repair!

I'm surprised there was enough meat in the head to jam that 18mm plug between the valve seats. If the head is good otherwise, you might think about installing a threaded adapter to drop that 18mm thread back down to its original 14mm, something like what's in the following link:
https://www.amazon.ca/Innovative-Pr...;hvtargid=pla-4584482463510412&psc=1

(There are nicer ones out there with the tapered seat, but the above link gives the idea.)

.. gREgg

Last edited by gREgg-K; 10/08/21 11:43 pm.

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Hi gREgg,
Thanks for the advice and the link.

Not sure if the term "super desperate" is as accurate as- " Why bother with a helicoil when I have a 18mm plug tap and fresh tractor plugs laying on the work bench "
Originality definitely took a back seat to functionality in this situation !

Since I have spare 700 heads, I'll just swap it out and hope the plug hole bodge isn't the tip of the iceberg . I don't relish going down these rabbit holes !


They say every dog has his day..
Trouble is, nobody tells the dog which day it is !

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Craig, if you are swapping heads, be sure the intake diameters match.

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Thanks Chris, I will be sure to keep that feature in mind.
I also think there is a difference in the plug reach on these..... some (earlier ones ?) took a short reach plug while others (later ?) took a long reach.
If I'm dreaming, somebody please correct me.


They say every dog has his day..
Trouble is, nobody tells the dog which day it is !

Will work for Guinness , MURPHY's preferred smile
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You're correct, Craig. The early heads had short reach plugs which tended to strip out. Later ones took 3/4" reach plugs.
.. gREgg


Spyder Integrated Technologies
Lucas & BTH Magneto Restoration
Lucas & Miller Dynamo Restoration
SMITHS Chronometric & Magnetic Instrument Restoration
[email protected]

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