advice please - injector stuck in head- what to do next

[cb750chris]

After looking at my car for an issue, I carried out an injector leak back test, and found injector 3 out of spec, so easy job whip injector out and fit a spare.


Not so easy, the injector is stuck solid, I suspect the copper washer had leaked and filled the space around the injector up with crud


So, I have tried warming the engine up, soaking in penetrating oil, carb cleaner, heat, etc all to no avail - the top of the injector is turning in the body.


So I now have the rocker cover off as it was damaged trying to get the injector out, bit the injector is still stuck in there - not broken off yet....
I have run a small drill down the side of the injector body, to bypass the o-ring in the head (let the oil get down to the right place), soaked overnight, and still no joy.


So, I am now wondering where to go next. I have a spare engine, so parts are not a problem, bit wondering how much more I can do to this injector before it breaks off, and is it worth carrying on, poor do I swap the head, or even the whole engine - just wondering which is easiest (and cheapest) - head gasket looks to be £50, and suspect I will need injector seats recutting, or swap engine and change slave cylinder. (Clutch is only 12 months old, so will be fine)


Thoughts please