well took head off, found that because they had used bolts in the exhaust instead of studs they had pushed the back off the holes through to the water ways, so water was running up the stud and into manifold (hence smoke), but.... changed head, put studs in, new gasket, new bolts and it still smokes, take plug 1 out and it steams, start it up again, take plug 2 out it steams but not number 1????????

Any ideas???????