Re: Stuck spark plug
The R43XLS is basically a replacement plug for the superseded C43N Plug used in 396 V8 engines in the mid 60's, the 62 305D called for a C44S plug(long discontinued). Provided the R43XLS plug has the same reach as the C44S plug it will work though C44S plug is a step hotter. The early 305 V6's had shorter reach plugs so it's critical to use the proper length of spark plug.
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