Used Patriot Performance Stage 3 PI heads. They feauture CNC ports and oversized Crower valves, springs, keepers, and retainers. Patriot claims 40-50 RWHP gain with just the heads! These heads were removed from a running turbo charged Lightning. The heads have just been resurfaced and a fresh valve job. The motor started some detonation, and a few chambers just started to see the effects. They have been repaired but are not 100% perfect. I have taken photos of the WORST of the damage. If i still had a mod motor i would definatly run them no worries, but i don't so they need to go. This can be a great deal for someone since they retail for $1600 new, and they are freshly machined. $800 o.b.o
https://www.patriot-performance.com/xcart/product.php?productid=6&cat=30&page=1
https://www.patriot-performance.com/xcart/product.php?productid=6&cat=30&page=1