Engine rebuild with no former experience........

With some luck the heat from the welding will loosen the bolt up. Try penetration oil and let it sit over night.
Rudiger

Try giving it a few whacks downwards with a large hammer and a punch. Often a shock might loosen it.

Well positive and negative, here is how it went today.

This is the bolt that made it out.



The one I had to cut off, I think I will be able to get this out fairly easily. Th good news is there was no damage to the head.



The other side.



The damaged intake manifold. It's not going to be easy to get the shaft of the bolt out. Once it is out, I will need to get someone to TIG weld the damaged area to repair it. There also looks to have been a bit of corrosion to the surfaces where coolant was washing against the surface and leaking under the gasket.

More table space set up.



Removed the rocker arms.



This was a good investment.



Next I decided to get the dip stick tube out of the way.



It came out easier than expected.



Then the tensioner.....



...and manifold.



Using a strong magnet to ensure the chain circlips don't go missing.



Releasing the cam shaft bolts.

Removing the chain guides, these ones are ten years old.



Not much wear.



Refreshing my memory before taking the heads off.



First head, cylinders 5 to 8.



Other head, cylinders 1 to 4, you can see cylinder 1 which had the valve guide problem has the most build up and is oily.



Surprisingly, it also has the cleanest piston???



The bores all look in reasonable condition with the cross hatching still visible to some degree.





Curved guide removed.



That's it for today.



I did try to remove the front cover, all the bolts are out but it didn't want to come off so I will investigate more tomorrow. Perhaps the oil pan needs to come off first.