It took me a while to find the right head bolts for my 1983 258, so i thought i would update this thread to help everyone else out.
I ended up ordering ARP's 258 kit from Summit (ARP-112-3601) and found out after I got the package that they were 1/2" and I needed 7/16". I looked up on the internet and found out that AMC switched their head bolts from 1/2 to 7/16 in 1981. Summit or ARP does not have a kit for the 7/16". You have to piece it out. I called ARP directly for the part numbers. ARP recommended that i call Summit back with the part numbers to get a better price. I called Summit back gave them the part numbers for the bolts i need. The price was better than going through ARP directly even though they are coming from ARP's warehouse.
Thats the boring story. Here is the info you need to order 7/16" ARP head bolts for the 258:
- 7 short bolts (3.75"), HAP3.780-5, $2.57 each
- 7 long bolts (4.5"), HAP4.500-5, $3.85 each (this was ARP's cheaper price which Summit matched)
- 14 washers, 200-8509, $0.72 each (washers are strongly recommended by ARP)
Total price with the $9.95 handling fee= $64.97
All of these bolts are head bolts, not stud bolts. I was told that I will not need the stud bolts since I have an aftermarket aluminium valve cover.
I hope this helps everyone. This was the info that I was not able to find on the internet. (Probably be cause I'm blind)
1983 CJ7 rebuild: http://1983cj7.blogspot.com