Does any one know if the head bolts supplied by Roverparts.com ( BA ) are factory ones ?
I mean the ones with the part number ( ERR2943 and 2944 ) at the head of the bolts.

Thanks in advance for the info.

 

I doubt it, they will most likely be aftermarket and hopefully not from China. Why do you ask?

 

Bought some over the web and the heads are marked " AA 10.9 ". I suspect they are not stretch bolts. Since it is a big pain changing the head gasket, I want it to be done right the first time. On the V6 Toyota engine I rebuilt, only some of the head bolts are stretched during torqued down. I.E. only some of the head bolts has the same sinking feeling of stripping the thread when doing the second 90 degree torque down. That lead me to believe the quality of these bolts are not consistent. Of the 10 head bolts I have removed from the one head ( all have the part numbers on their heads ) , I can see they are all stretched when match to the new bolts that I've got.