The 3923s are for the cast iron magnum engines. There is a different number
plug for the 4.7s
"William H. Hiatt III" wrote:
> Ok, last time I'll aska question. I put some 3923's in today, gapped at
> .040, and it doesn't rev nearly as quick as it did with the +4 4417's.
> Maybe it's just me and I'm crazy, and it's in my head, but does that make
> a difference? Thanks alot
>
> william
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