Just got these heads in the mail (IrkBay special), "professionally reworked" the PO said (supposedly "Not" cracked...similar to a "No" rust car). The crack hasn't propogated to the outside and I had plans to slap them on my FFC car. My question is, are these still usable in their current condition? Or should I not bother installing them (note: Porsche 914 repair fund for the FFC is currently in the RED, everything around the house seems to be going south at the same time)
I saw a post where Jake described welding them to 12mm, are we talking about the spark plug hole dia.?