Datsun
Roadster Parts from Rallye Enterprises, Ltd.
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Datsun
SPL310 - SPL311 HEADBOLT INFO
Originally
the cars came with 9 headbolts that were one length,
and one bolt that was longer, to make up for the loss
of thread length that the bolt that holds down the
engine pulling hook incurs. A huge amount of mechanics
and owners did not realize this, and put the longer
bolt in a hole without the engine hook (or a stack of
washers) under the bolt head. The result would be the
torque wrench reading that the bolt was "tight" but
actually the bolt was hitting the bottom of the hole.
After a length of time the head gasket would blow out
at that point. If I had a dollar for everytime someone
has called me the last 25 years and said their head
gasket keeps blowing at a different point...
In
the past we have just sold people 10 of the short
bolts to prevent this problem. It is really better IF
you ARE using one of the engine hooks that go under
one of the headbolts to use one of the longer bolts.
You can order the sets either way, with 10 short
bolts, or the kit that says (9 + 1) which has one of
the longer bolts.
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