Does anyone know what a set of stock 5.3 heads flow? <img border="0" alt="[driving]" title="" src="graemlins/gr_driving3.gif" />

 

If you haven't already done it, you might get a response on the internal engine forum. I think some of the f-body guys run a modified version of the 5.3 heads? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />