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I just bought a 93 4Runner. When I got it, the guy told me that it was just a vacuum line issue, but when I got it home and did the compression test and it was definitely losing compression. It was definitely the head gasket that was blown. So, I took the heads off and took them to the machine shop to get them done. I replaced the timing belt, water pump, injectors, and a new radiator. I've got everything put back together and now I've got lifter ticking going on. My compression is fine. It's not overheating or misfiring. It's just the lifter ticking. I've already replaced four shims that the machine shop missed. I've checked the valve clearances and they are in spec. My question is, is there something I've missed or did the machine shop not adjust the valves right or what. Any opinions or help would be greatly appreciated. This forum has been a great help for me so, thanks!