Posted by Tom Fleming on November 22, 2011 at 04:09:32 from (206.193.250.146):
In Reply to: 10-20 head stud posted by oldiron29 on November 22, 2011 at 03:54:37:
Oldiron, I would tend to agree with you. There are a couple of ways to attack this in my opinion. The easiest one has some risk to it that you will have to remove the head again if it doesn't work. for the studs that "don't hold" well, will they at least slightly snug? If so, get some JB weld. Chase the threads again in those holes with the correct size tap. Apply the JB weld to the holes and also the studs. Install studs to just slightly snug.
Let it setup for 24 hours, and then go ahead and install the head again.
Other way would be to drill and tap the holes out to the next size if there is enough meat in that area of the block. Have a machine shop turn down the new bolts so you have the larger thread going into the block, and the correct size for the rest of the bolt. You will have to cut new threads onto the custom bolts, but should work just fine. Also, you will probably have to use Locktite for the custom bolts to hold them in the block, as they will not have a shoulder to rest on for tight, and will turn when you go to torque the head on. You could also use a punch to peen "lock" then in place, but be careful not to over peen them.
Last option would be to use a Helicoil if you can find the right size. also, a good choice.
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