Hello all, I'm new to this forum, but frequent the corvette forum.I just finished swapping the cam in my 2007 Z06, but now I need to replace the PAC 1207x valve springs. If any of you have done this, did you use the TDC method or did you use compressed air in the cylinders? I've been reading and noticed some say definitely use air, and others say you're good as long as you have the piston at TDC. Thoughts? Thanks in advance.