I have an alfa 164 sport 1991 that dropped a valve guide. I tore the entire motor down, pulled the pistons out and re_gasketed the whole thing. I had the machine shop replace the valves and guides as well as mill the head. Now here's the delema, its all back together in factory specifications according to my knowledge but I have a dominate tick coming from my rear head which happens to be the head with new lash caps. The only thing I can think of is that I didn't factor in the material removed during milling when deciding the proper lash cap to install. What do you think? Any advice would be helpful, I put a ton of time love and money into her to be smacking valves again. Thank you in advance for the input!