Hi Keith,
The easy answer first - spark plugs. I recommend the NGK V-power. I just installed a set of XR5 (#3332) plugs on my J and am pleased thus far. Available inexpensively at Rock Auto. You can upgrade with iridium and such but much more expensive.
The difficult answer next - spark plug wies. The Lectric Limited set for J and Ram K was correct in appearance and probably fit well. It was $950 some ten years ago. That is not a typo. No wonder it has been discontinued. The Lectric Limited set for F/G would not be correct in appearance but can work, but as you state, some of the wires are too long. I just made wires for my G using correct reproduction spark plug holders from the late Michael Burke and correct wire routing. Wires for #5 and #7 are much longer and #8 is longer. #6 is shorter. The remainder would fit ok. The problem is not just the headers, but the wire routing is different on J and ram K. 63-64 used the big spark plug wire towers attached to the valve covers, the F used none of those, and the G only used the big tower for #1 and #3.
Your next option is to buy a "semi-custom universal" set, which would only require cutting the wires to proper length and attaching the spark plug boots (which will be included). Most (but maybe not all) of these universal sets have long enough wires.
No matter what you use you will need heat sleeves over the boots on at least #5,#7, #6, #8 and preferably on all 8 boots or the header heat will destroy the boots on a long run. Ask Jamie about his drive to Kokomo. Changing plug boots on a J or ram K in a parking lot gets old real fast. The wires take a beating as well. High temp rated silicone is advised.
If you desire reasonably correct appearance, your only option is to custom make your own set. I like to get my supplies from Ton's Performance
Ignition parts and accessories – Ton's Performance (tonsperformance.com) It is not that difficult to make your own wires. You need a really good crimper. I use one from MSD. The J and ram K used a dark orange 7mm wire (same color wire was used on early 413 and 426 max wedge Dodge and Plymouth) with orange spark plug boots and 180 degree black distributor boots. The spark plug boots were 90 degrees except for #3 which was an obtuse angle like F and G for the dipstick tube (but 90 degree will work ok on #3). I can no longer find 7mm orange wire in bulk. But 8mm bright orange wire in bulk and universal sets is readily available online and still looks more correct than black wire imho.
Carl
------ Original Message ------
Date 6/17/2024 4:31:13 PM
Subject Re: {Chrysler 300} 300J and Ram K spark plugs and plug wires
Hi Keith,
I don't expect the Lectric Limited 6302-000 wires we're running on our F and G longram cars will work on the shortram '63-'64 cars. A very few years ago, Lectric was offering shortram wire sets, but they were far more expensive - somewhere in the $300-$400 range per set. I don't know if it was just the high price point that caused them to discontinue these, or if they had additional issues with their performance.
I'm interested in hearing Carl's opinion, as he custom makes his own wire sets for his cars.
Noel
Hi Folks
What are you short ram folks using for spark plugs?
Also, Lectric Limited doesn’t make a set of wires for these cars . I do have a set of their 300F 6302 wires that I asked them about but they won’t commit to them being a good fit. Because of the difference in exhaust manifolds they might be a bit long but figured I’d ask you folks if there’s a ready-made option Note: I have these Lectric 300F wires because I made my own wires for the F from a Summit Racing set because it has an MSD box and prefer not to do it again.)
Is Napa a short ram “ready made set” option?
Thanks in advance!
Keith
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