I have a few pairs of these awesome 7.0 liter LS7 CNC RE-CNC ported GM aluminum cylinder heads #8452 fresh and ready to run. These are GM heads that have been RE-CNC machined to flow 395 CFM! These take the stock 2.200 intake valves and 1.610 Exhausts. 72cc chambers 290 cc intake and 94cc exhaust ports. They have a new valve job and new bronze guides. (The GM cast iron guides never last) The factory CNC GM heads flow around 350 to 360 CFM and have iron guides. These flow 395 CFM! All chambers and intake and exhaust ports have been machined. These heads are far better than new! These heads will fit on 6.2 4.065 bores or bigger. They do take the 7 liter intake manifolds. You will not find these heads anywhere else. These were professionally machined at Magnatron Machining. These are very serious heads and are completely finished and ready to assemble and run with your own valves and springs. There is a lot of work, time and money in these heads. I am selling these for $1500.00 a pair. Firm. Yes there are bigger higher flowing even more high performance heads out there but they are a lot more money and overkill for many people. How would you like to whip everyone with a pair of factory heads? Take a good look at these pics. There really aren't any heads out there that are in between stock factory LS7 heads and balls out high performance big buck stuff. At this price there is no comparison. If you want to keep your car all GM, then these are the heads for you. Ask for DJ. Please, serious people only.