Hi guys has anyone had anything to do with supertech head components?my local mechanic says he uses ferrea but they are way cheaper than supertech which makes me wonder that they might be crap.Any advice would be good.

Speak to a decent engine builder man sounds like you want to build a good motor but you may be buying parts that won't work with each outer, just saying not trying to pick just know from past experience that's all
Try someone like Lewis race engines ect