dazednconfused's slow mighty build

[BradMph]

The G63B original head bolts are not one use only. If you update them and have replaced them with later versions of head bolts, then you probably have the one time use ones.
My G63B has been using the original head bolts for the entire life of the truck, approx. 27 years with no issues in the past 20 years with head gaskets. I have only blown one gasket on the truck, but have received 3 inferior casting cracks which caused head to be replaced. Never have I replaced the head bolts. They use the Allen Head designed bolt and the originals can be used over. It helps to use the same bolt for the same hole each time, just like internal engine parts.
A manual might suggest replacing them which is normal for manuals to say. These one time only bolts have seemed to appear from performance parts builders. I just spoke to a Fastener company a couple days ago about this same issue and they are actually not happy about the one time use bolts. They explained the older bolts used in vehicles did not stretch and get tweaked like they do today. The company could of sold me the bolts, because that's what I went for to get. They said if yours work fine, there is no need to replace unless they specify on packaging to only use once.

AN accurate torque wrench is a must and I always go for that higher setting. For example 85 to 95lbs, I go to about 92-93. I drive it for a bit and get that engine all warmed and check the torque again. Then check it again in about 500 or less miles. These damn trucks are so finicky with them head gaskets, a little more torque won't kill them.