Frozen head Bolts

[spareparts]

hate to tell yo this, but I've never had any luck with getting bolts out of older Japanese motors. OMC went with a simular aluminum in the late 90's and I've had the same luck with them. I'd personally try an inpact gun, just let it hammer for a while, it'll shake some corrosion loose. Try a little heat on the head and block. Heat then let cool, try the impact, heat, cool, impact, repeat as needed. If you break them off, you can drill them out