possibly picking up ls6 heads..
#22
click on the links to check out the heads..
(pic of valvesprings)-
http://www.putfile.com/pic.php?img=3830518
http://www.putfile.com/pic.php?img=3830517
(valves)-
http://www.putfile.com/pic.php?img=3830516
http://www.putfile.com/pic.php?img=3830515
http://www.putfile.com/pic.php?img=3830514
http://www.putfile.com/pic.php?img=3830513
(pic of valvesprings)-
http://www.putfile.com/pic.php?img=3830518
http://www.putfile.com/pic.php?img=3830517
(valves)-
http://www.putfile.com/pic.php?img=3830516
http://www.putfile.com/pic.php?img=3830515
http://www.putfile.com/pic.php?img=3830514
http://www.putfile.com/pic.php?img=3830513
#25
As far as head porting, The shop better know what to do. Just tell them your application (high rpm, low end tq, drivability, etc) and they can port accordingly. Just hogging out tons of material might increase runner volume but not increase flow (or velocity). As a general rule, smoother runners with fewer angles will give you better VELOCITY which helps low and high end performance.