Go here
For explanation of Vortec heads..basically they have a better flow and combustion chamber than the older heads..
http://www.chevymania.com/tech/vortec.htm
Hope that helps you...
And check this out:
http://www.customclassictrucks.com/techarticles/0405cct_head/
For explanation of Vortec heads..basically they have a better flow and combustion chamber than the older heads..
http://www.chevymania.com/tech/vortec.htm
Hope that helps you...
And check this out:
http://www.customclassictrucks.com/techarticles/0405cct_head/