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Well considering no one at this time is making any new ones I guess whatever you have on hand is good . The newer style is better of course and if you can still find some then I would buy them.

Rosco, sometime in my life I plan to drive the "AlCan" high-way . My father worked on building it before the war, and used to tell use stories of Alaska's beauty (and bugs ! ). I have been to Alaska twice on cruise ships, but never the interior. I still have family in Fairbanks, and Sitka. I...

This modification of using "ARP" studs for higher torque came from Tracey Varns. He has been doing it for years on his modified pulling tractors, and said he has no problems with head gaskets going out afterwards. Of course the original gaskets have lasted for years too. I just want the...

I'm sure it would take some outrageously high pressure to do it ! In our applications I think it would last the engines life no problem.

The studs have a standard thread going into the block, which should have a depth of 1" . The threads where the nut goes on is a fine thread. I see your a night owl too Gimp !

The studs are 9/16" with a minimum depth of 1" of threads. That should take some serious amount of pulling pressure to pull out. More then likely you will strip out the nut's threads.

With the better studs you can increase the torque to the heads, thus getting better sealing on your head gaskets.

Got the part numbers from "ARP" . The studs are all 9/16" . The 6.160" long stud is # AQ6.120-1LB , price is $11.50 ea. . The 6.380" long stud is # AQ6.500-1LB , price is $12.34 ea. The 2.620" long stud does not have an exact match, but this is the closest and should work fine, #AQ3.475-1LB ...

Here are the rod bolts. The head studs from "ARP" are not under the Hercules engine. What Tracey did was use the specs of the studs and called "ARP" and told him what he needed. They had the same studs under a different application. Here are the studs specs, and I'll call "ARP" and find out the...

I agree. We should all start to use the "ARP" head studs. They have a higher torque limit then the stock old bolts anyway. I don't think 20 or even 40 more Ft Ibs torque would hurt with the newer studs.