Yes, you must use the correct length, always.
Too deep, cracked head or broken bolt. Too
shallow, bolt or head stripped threads.
Another danger is not cleaning threaded holes.
Just a little oil or grease can crack a block.
A "dirty" hole, when a bolt is torqued down,
can create so much hydraulic pressure a block
can easily crack. Rocks, during construction,
are often split this way. Drilled dynamite
holes work the same way.
Torque bolts, such as head, crank and rod,
must be replaced after use. They are designed
to stretch a bit on torque which holds them
in place. They do not "rebound" and return to
normal after being torqued. Almost all manuals
suggest you "throw away" your bolts upon a
rebuild, especially head bolts.
Ok, one "no" and one "yes" on this question,
so far. I hope others will add their thoughts.
Thanks,
Billyray
