Quote:
Originally Posted by ps2cho
you should not use the F8DC4's because the seating is different. You are building up carbon on exposed threads.
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Both of those plugs seat exactly the same. Only difference is the F8's are slightly "colder" plug.
http://www.peachparts.com/shopforum/showthread.php?t=277252
Quote:
Originally Posted by JamesDean
So H9DC0 vs F8DC4
The 0 and 4 in the end seem to be:
4 seems to have an extended insulator nose
0 just says "deviations from basic version"
So I take that the 0's were the basic version and anything above that is an "enhanced version" which whatever the number corresponds to...
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