There
was a slight initial & silent turn then some 'tinkling' as more pressure was
applied the a loud 'crack' as the bolts released. The short bolts looked new,
others had faded slightly. (Both head bolt sets looked the same). Any thoughts
on 'hydrogen embrittlement' or reuse? (I have read that those not the original
color should be thrown away and a full set of new bolts used).Myles
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1990 S4 Stone Grey Metallic
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Your head bolts are somewhat unique for the condition of the heads.
It will be interesting to see how much torque it takes to get to the proper angle torque, if you reuse these bolts.
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greg brown
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In case anyone is interested or it helps someone in the future.
My long bolts, from the base of the washer, are 195mm long, protrude through the head by 120mm and have a threaded length of 107mm.
My short bolts, from the base of the washer, are 145mm long, protrude through the head by 70mm and have a threaded length of 37mm.
Everything I can find indicates that the torque spec for both length bolts are the same. A quick measurement of the distance from the top of the block to the start of the threads in the block indicates that all bolts, whether short or long, have roughly the same number of threads engaged.
Myles
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1990 S4 Stone Grey Metallic