I'm rebuilding my motor and want to know if they are reusable. The were in the car when I bought them. So I be able to reuse them. About to tq head on here tonight.

 

Normally not rreccomend.. just get some ARPs and replace them

 

How much power, torque, and boost was made before the rebuild? Also was the car a street car or a race/drag car?

 

It made 550 before on an fp red and a street car. I thought I read somewhere that the map h11's were reusable.

 

Isn't it something to do with whether they stretch, or not, when torqued up. I thought that the original headstuds did stretch but the arp and h11 studs don't, hence they're reusable. Could be wrong about this though.

 

They are re-usable.

 

Many OE engines use what is referred to as a TTY (Torque-To-Yield) bolt to secure the cylinder head(s). These bolts become stretched permanently when they are torqued to spec, and therefore cannot be reused. I think this is what's confusing some of you. Your aftermarket head studs do not become permanently stretched when torqued to spec, and should be reusable unless they were significantly overtorqued during the original installation.

 

^+1 on this. I recently had to replace my headgasket and I have ARPs. I reused them and things were just fine. Just measure them and compare to each other to make sure none of them are stretched. Then double check with the measurement of a brand new one. Should be able to get the spec off of the manufacture website.