For what it's worth, I bought a "special wrench" from the Snap On dealer for torquing the splayed 12 point bolts on my four bolt caps. Mine is a 1/2" 12 point box on one end and 3/8" square drive on the other, and measures overall 2 1/2 " long. I believe they are available in 1/4", 3/8", and 1/2" drive. The part # is FRDH16T, but I can't get it to reference on the Snap On website. I was told by the local Snap On guy that these were designed for use in the aviation industry. The one I bought worked great for my four bolt caps, and I'm certain that they would be perfect for torquing those bolts on your heads. Check with your local Snap On guy, I'm sure that he can help you out - or you can make one up as was suggested earlier.
I just found the item/s it's called a torque adapter - comes in several sizes, the one I have is #FRDH161. Do an on line search for snap on torque adapters.
Selling the last of my BBF stuff so everything is priced to sell. Shoot me an offer worst I can say is no. I’m located in Trumbull CT 06611 and I’m in northern NJ 4 days a week around the 07052 area. I can meet up in person as well
here’s what’s for sale:
Used procomp aluminum HV water pump...
BBF tie bar lifters. part # KTL-S875760-17 .875body / .760 Offset Intake and Exhaust.
Like new, Used for Idle time and one 1/4 mile pass. bought 6/26/19
$1750 new.... Asking $1100 shipped.
Call or text Dennis, 5078-524-2364