I'm new to the Porsche scene and have just started my 911 engine education... Everybody is a beginner at some point... My #1 head in my '67S has a crack near the sparkplug hole. Can the head be welded/repaired? I've heard of machine shops doing this for VW's. What does a single early S head go for? I'm very interested what you all out there recommend. Thanks for the help.