And buy a Six-point socket to put it back together. 12-point sockets can't apply the high torque very well.

Just get a piece of chipboard or cement sheet like material made from wood chips etc make a hole so it fits over the bolts, then put a bigger nut over the head bolt, arc weld it on the inside to the head bolts having one lead over the bigger nut and presto.

However like DD said use a proper hex not crown type of socket or ring spanner the full hex (flat sides unlike crown with teeth) will put even force all around them.

I had a worse situationr happen to me last year and used the arc welder in the same manner and just tack welding puts enough heat also at the same time.

Get a witworth socket. Size escapes me atm, (Maybe 3/8?) but hammer it on, and bobs your uncle.

Thanks alot for your Info and help.I know i could always count on you fellas over there in Austrilia and DD For help when it comes to the datto.

My final option is that I am carrying it to the mechine shop to get them drill out,What are your taughts ??

use that as the final option, try the other options first.

That's silly -- take it to a shop.

Just borrow a small pipe wrench.

For torquing the head bolts, purchase a six-point socket

I have Tried Both Long and Short pipe wrench.
Have a six pt socket With 1/2 inch Drive.

So when you used the pipe wrench, what happened?

* If the bolt did not turn, use a piece of pipe to extend the handle. Longer handle = more torque. When you apply enought torque it will turn. I've been in this situation.

* If the bolt head rounded even more so, and the pipe wrench slipped on the bolt head, tighten the pipe wrench. Basically you want it as tight as possible, and just barely able to fit onto the head. As you pull, the wrench will bite into the bolt head.

I had some bolts heads that I cut off with hacksaw (Isuzu engine with corroded bolts which were stuck to the aluminum head). Then pull the head up over the bolts. After that the bolts came out very easy with a pair of vice-grips.

Dd why say its silly and take it to a shop then provide info on options? Id give it a go, as long as I had a spare head just incase.

try the pipe,wrench or cut the tops off the heads and lift off as dd did.

But then again look at what happened when I tried to remove a damaged over tightened gearbox drain plug.... I gave up.