[Steve C.]

Information on the Edelbrock link offers some notes on the subject. Personally I've always used a ARP stud kit on my heads.

https://www.edelbrock.com/pontiac-he...-kit-8556.html

https://www.edelbrock.com/edelbrock-...ock-heads.html

Note that Edelbrock Cylinder Heads for the Pontiac 389-455 engine require a special head bolt. The head bolt boss heights have been changed in the Pontiac cylinder head to eliminate problems with cracking at the upper head bolt boss end for high-output applications. The new head bolt boss height also simplifies the head bolt kit by requiring only three different lengths instead of six different lengths in the previous head bolt kit.



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