I have had more trouble with this company than I would like to admit. I Purchased a race head from them in 2010, it was supposed to be a 7 bolt head that was ported with a 1mm overbore on intake and exhaust. New valve guides, manley springs and retainers and new valve seals.
I ran the head for about 100 miles on my old project (724) and had valve to piston contact. I was under the impression at the time that this was due to installation error on my part. I thought that a lifter had stuck and that I was up a creek. I ended up parting the car out and put the head in mothballs for a few years until I got another GVR4. Fast forward to now, and I have 504/1000 ready to get built up.
I pulled the head out of the back of my garage and took it to the machine shop to check it out. There were 3 bent exhaust valves, which fit with the 3 marks on 2 pistons on my old short block. I bought a new set of exhaust valves and all new seals to have it put back together. My machinist cleaned the head and was in the process of installing all the new valves, and told me that I had no clearance on my valve guides. Not too little clearance, but none. They measured the same as the size of the valves. If you don't already know, there is supposed to be .002-.0025 inches of clearance on the valves in the guides.
I immediately called mike at built 4g63, and told him what I was told. He replied that there was nothing he could do or would do without me sending him the head to check out. I am currently in Oregon, and already have the head at a shop to be repaired, so that wasn't gonna happen.
Second part of my problem is that I was mocking up all the parts that I have for the head (2g SMIM etc...) and noticed that the port match on the head didn't match the gasket...problem. I checked the part number and it is definitely a 2g gasket. I check against my manifold which is a 2g, and it matches that perfectly...So basically, I paid for a 2g head to be built to fit a 6bolt motor, and didn't get that either....I got a ported 1g head.
So, basically as it sits now, I have a manifold I can't use for a head which is not what I wanted, and the company is not interested in making it up to me. I am pursuing other recourse as we speak, but I am confident it will be to no avail.
Suffice to say, I will never be working with this company again, and hope to spread the word so no one else does either. I am not trying to bash the company, just trying to inform my favorite community of my experience.