Are the studs 3/8 or 7/16?
The studs are 3/8" Mario!
Got out there this morning and tore the old heads off, and cleaned things up. Unwrapped the new Dart heads and got them sitting on the block. After sealing all the studs in the kit I ran them in with an Allen wrench. Seems not all the holes in the block are tapped the same depth as they sometimes stopped fine, and other times seemed like if I wanted to go further they wouldn't have enough thread to run the nuts on. So just stopped when they looked equal on those holes.
I started to torque them in the 3 stages, but discovered the stupid 12 point nuts can't tighten using my 6 point socket! My deep socket set is all 12 point except the two smallest sizes, 1/2" and 3/8". These are 1/2' nuts, so I couldn't even get to the first setting of 35 lbs. before the socket slipped!
I had to stop at this point and called the local used tool shed place to ask if he had any deep 12 pt. sockets in 1/2". He had several 1/2" drive for $2 each he said, so ran over and grabbed one. Never been in the place so did a walk around to see what else they had, and came home with a couple Husky brand ratcheting box wrenches too! My 9/16" and 1/2" from my Craftsman set are both missing, so for another $4 ea. I got those two. Any excuse to stop for the day is a good one anymore, so I locked up, and will head out tomorrow to torque everything down, and then finish assembling it.
We're high 60'sthe last couple days, and more tomorrow, so great weather to work on the car in a warm shop!