FORD CYLINDER HEAD VALVES ADJUST

So I'm Trying To Adjust The Valves On My 302 Engine And When I Built It, I Did The 0-lash Then 1/2 Turn For "best Results " But...

I Have To Get A Valve Adjustment Done To My Car And I Wanted To Know What The Estimated Cost Would Be. Also My Engine Light Keeps Coming...

Can The Valve Clearance Be Adjusted For The Focus, If So How Is It Done?

I Was Needing To Know The Steps To Adjusting Valves On 4.0 Engine

On A Inline V6 4.9l 300 D Engine. Are The Valves Adjustable? If So Any Explination Of How Would Be Helpfull