So i recently decided it would be a good idea to buy a subaru with a blown headgasket. Taking it apart was relatively easy, but the difficult part was when i sent the heads to the shop and they gave it back to me in pieces. I put the head together best i could and began the reassembly, but now the driver side doesnt seem to be correctly aligned. When i turn the camshaft sprocket it turnes past where top dead center used to be. Can TDC change? do i just need to find where the new one is? or do i need to take the heads off and reassemble it?