[MrDunge]

Oh yes I have ran into this several times on the 4z head. The head bolts corrode to the block where the head and block meet. You are going to have to drill the head off the bolt and then slide the head off. Wire wheel the area where the bolt meets the block and let it soak in some good penetrate. Tapping on the shaft w a brass hammer will also help to vibrate the gunk loose. Time, a pair of good vise grips or weld a new head on the bolt and it should come loose. If you need a replacement bolt let me know I have plenty and I will send you one for the cost of shipping

 

[MrDunge]

That burnt oil smell is normal when removing those bolts. You'll smell the same smell when you remove flywheel bolts. It's a smell You'll never forget. Kinda like diff fluid lol