Need spark plug explanation....AC 103 vs AC 103S vs Champ UY6

Posted by Bob Supina On 2014/8/8 21:48:06

The 1937-38 Super Eight Shop Manual specifies using the AC 103S or the Champion Y-4

In my inventory I found an AC 103 but it looks more like one that would be used in a Crosley.

The middle plug is the recommended AC 103S.

Also in the picture is an AC 106, which is a hotter plug and more readily available on the internet, and I

Yes, the local auto parts stores can get Champion 10mm UY6...

Does anyone know if the UY6 has the same characteristics as the 103S or even the 106????

Any answers, comments or suggestions are appreciated.

Thanks.

Bob

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