Watch the spark plug location. I believe that is the change on Vortec heads. Some header tubes will block access to the plugs.
I installed a set of Hedman Hedders yesterday and the fit perfectly with clearance around everything and good plug access. Their tech dept. will help in making the selection. I was very pleased with the ease of installation.
Last edited by warren57; 07-13-2012 at 10:39 AM.