What spark plugs are you currently using?

[The Master Cylinder]

I had been using Autolite 3076s. But found they were significantly shorter than the original Champion 3Xs. The brass connectors were barely able to reach them, a couple of them were laying on the dustributor body. #3 was so close to the timing rod that it would short to it occasionally. I changed to Champion W18s, which are about the same height as 3Xs - problem solved.

The Champion W18 is quite a bit taller than the 3X. On the left is a Wards plug that is about the same as a 3X. You could use the brass connectors for a B engine, which are longer than the ones for the A engine.

 

[katy]

I like the C-4s, I have 2 NOS, but no luck finding more.

Rock auto has MOTORCRAFT SP465A, AUTOLITE 3076, CHAMPION 561 {#W16Y} and CHAMPION 429 {#3X}.

Methinks I'll order a couple of the 3Xs from them, probably as close as I'll get to finding C-4s

 

[ndnchf]

The Champion W18 is quite a bit taller than the 3X. On the left is a Wards plug that is about the same as a 3X. You could use the brass connectors for a B engine, which are longer than the ones for the A engine.

Thanks, I had not seen them side by side. I thought about ordering model B connectors, but my local O'Reillys had the W18s on the shelf. They run just fine. BTW, O'Reillys also stocks the Autolite 3076s.

 

[Tosti36]

The Champion 3x is a great plug!