they cant leave anything alone can they. Regular bolts have worked for the last 100 years in automobile and every other kind of motor, so why bother changing them, i guess so they can make you buy new bolts every time you do anything, i notice there is alot of one time use stuff (mainly lock nuts) in our car, what ever happened to lock washers? to complicated for modern mechanics to figure out? (although, there really isnt mechanics anymore, just technicians who read what the computer says is wrong and change the part it says they should, most of the time being wrong because they dont know the damndest thing about cars). I read that in the bently, but figured they were just trying to make more profit. I will probably just use studs when my head comes off then. I was just going by the $250 dollar thing, didnt know bolts were only 40 bucks, how the hell much is the head gasket? please dont tell me the other 200 bucks worth. By the way, you dont need arp bolts, the iron treads in the block will fail before the bolt ever will.

Beecher

 

Matt, now I'm confused. Alex of TireRack has said here that lubricant causes incorrect torque readings:

 

I've always used antisieze on the lug nuts/bolts. If you've ever had a Fiat you'd know that there was no choice!

The idea about lubricating threads for torquing is that the surface finish of the bolt's threads doesn't create a large frictional force that reduces how much the bolt is really tightened. If you have a bolt that stretches as torqued, this is especially important.

Others have any other insights?

Matt

 

If threads are lubricated then the bolt will develop more preload for a given torque (as alex stated it takes more turns, so you are stretching the bolt more).

The bolts I use regularly in my day job have locking features, so we don't worry about them loosening up.

 

What does everyone think about this? Ebay head, P&P, stock valve size.

http://cgi.ebay.com/ws/eBayISAPI.dll...MakeTrack=true