I got an E-mail from ARP and they said this part number:

PN: AJ3.050-1LB is an 8740 stud with .825" of 3/8-16 and .850" of 3/8-24. Torque would be 50 ft/lbs using the ARP Ultra Torque Lube.

Best regards,

Alan Nichols
Sales & Technical

Automotive Racing Products
1863 Eastman Ave.
Ventura, CA 93003
Toll Free: 800-826-3045


So, I ordered some of these too.

I think part of the problem was not enough pre-load on the studs with only 35 ft/lbs?