Quote:
Originally Posted by TransAm 474
What AC Spark Plug should we run in this? Just want to make sure we get the heat range correct. Just as a reminder, these are 12 heads, big plug......
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the 100% correct one is an NLA R44S;
many here have had luck using the one step hotter R45S which is currently available.
I have had good experience with the Autolite 85;
The Autolite 85 seemed to run better than the R43S which is a cooler plug than OE.