Join Date: Jan 2002
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Re: 258 Engine ID and head bolt size
I'm pretty sure that the first number of the build code is the year. Hence, since your's is a "3" it means 1983. The rest of your date sounds correct. I have a 1984 and my build code also starts with a "3", but the month is August, which makes sense if my truck was purchased in late 1983 as an 84 model. The 7/16" head bolts also seem to confirm that your mill is not a '79.
84 CJ-7; 258 I6; Restored-to-Stock Condition, TR Ignition Upgrade