How many of us are there? Owners of Dodge based RV's?

Is there some thing that would show if it is a big 440, I had to change my spark plus and and to take them back there were to small, like a 1/2 inch, now I have the right ones, that look longer like an inch

Jarlaxle wrote:

Is there an easy way to tell the 440-1 from the 440-3?

As I recall, look at the harmonic balancer: the regular 440 is neutral-balanced. The 440-3 is externally-balanced, having the same heavy bottom-end parts as the 440 6-pack.