The CNC valve job is a major upgrade to the performance of these heads. We measured a 24 cfm improvement in flow and 18 peak hp on the LS1 going into our shop El Camino.
Above Added: Fri May 16, 2014, 5:46 am EST
For Sale are 5 pairs of bare LS1 casting #241 cylinder heads that have been through a CNC Valve Job.
*Also if wanted for an additional charge you can have the cylinder heads filled with parts of your choice and setup to your specs.*