m20 head bolt question.

[timninja]

So I just bought a new set of 14 head bolts from Napa and they were threaded longer like 2-1/2 instead of 1-5/16,so I returned the set and went to some local European parts supplier and they gave me the same exact set $20 cheaper..do these bolts stretch or am I getting hosed repeatedly..because if these don't stretch then won't the longer threads "steal" eat right through my head bolt journals?"aluminum"

[timninja]

I took a picture I just can't figure out how to post it threw my cell

[b*saint]

All bolts stretch. Use a torque wrench and what ever the bolt manufacturer rates the bolt at with or without oiled threads.

[jlevie]

The amount of thread on the bolts, provided it is enough, isn't important. The metallurgy and machining of the bolt does matter in this case. I would not use as head bolts any that aren't made specifically for this purpose. And I prefer OE bolts rather than some random make.

[nando]

I don't really get the question, but yes M20 headbolts are TTY

[timninja]

OK let me start over because my question isn't very clear,should I use these head bolts that two semi reliable places have sold me despite the odvious difference in thread lengths?

B*saint -if I torque these bolts down the threads are longer on the new set,so won't I have excessive threads in my head bolt journeys and then they'll damage my head?

[MR 325]

How would they damage the head? It's not threaded.

What brand are the bolts?

[scottinAZ]

Use the bolts. If your head is moving around enough that the extra threads eat into the head, you have bigger issues than a destroyed head.....