Went over to my Mk1's for a days mincing on Thursday, took a few pics..
Had a quick search on here about the whole Coscast thing and I think this pic (of the distributor end of the head) would indicate that's what I have..
Now there's all this talk of sdium this and copper that.... but that are the actual benefits of Coscast over GM heads??
Apart from the reduced likelihood of it going porous.