4doorsssilverado

This is as they are advertised on the street kills website Streetkillz CNC-Ported LS1-LS6-Vortec-230cc "Mad Dowg" Head's Add 50+Whp To Your Stock LS Build With A Set Of Streetkillz 230cc "Mad Dowg" Complete Ported Cylinder Head's. We Have Had Gains Of 150+WHP With This Proven Head and A Custom Ground Cam!!! These Heads Come New And Complete With New Valves, Valve Seals And Sporting New LS6 Valve Springs Rated Up To .570 Max Lift. We Have Other Springs Or We Can Install Yours. CNC-Ported LS6 Cylinder Head Assembly CNC-ported aluminum performance head's Fits any 1997-2008 LS-Vortec Family engine 2.00 hollow stem intake, and 1.55 sodium filled exhaust valves 230cc CNC'd 'cathedral port' intake ports 80cc CNC'd D-shaped exhaust ports 65cc CNC'd combustion chambers 1 set per order Average Flow #'s: IN 317CFM @ 600 Lift/ 28" EX 233CFM @ 600 Lift/ 28" Not every CNC head is flowed to keep cost to you down you can expect +/- 5CFM

Mike at street kills in arizona he sell these on his site for 1350 without the valve job +shipping so I ended paying like 1500 something like that I believe the intake runners are 230cc and the chambers I belive are 64-65 cc///// On the cam I paid like 435 for it and hardly used it less than a 1000 miles I'm not sure on the lobes its a custom grind by a local speed shop here(some of the best around here) I could probably take 280+shipping its practacly brand new heres a picture of the cam I believe these are XER lobes but not so sure need to ask

I added little strips of 3m double sided tape to the back after losing the same cap 2 times in the same day thankfully I found it thrown on the side of the road undamaged haven't had any problems with it since

I have a set of 799 heads cnc ported(same as 243s) with a 3 angle valve job these were bought brand new and sent to get cnc ported they flow [email protected] lift these are on the truck right now but if someone is intrested I will pull them off, these only have about 1500-2000 miles tops the only reason I'm selling them is cause I bought a 6.0 L76 that already come with the L92 (LS3) top end. I paid like 1500 for these heads they're really nice only want $1000 I have pictures of when they were bearly done with the cnc porting but like I said these only have like 1500-2000 miles tops, I'll try to post them but if not send me a pm or and email and I can send them to you threw phone. Also have a comp cam custom grind cam 228/232 with .588intake/.595exhaust with a 111 lsa has less than 1000 miles this one is taken off of the truck right now only looking to get $250+shipping. They'res nothing wrong with any of these parts it just I'm not going to be able to use them on my 6.0 I just bought.

Heres a pic of mine but I still need to get all the claddings for the sides I dont know how to add pictures it says they're to big but check out the gallery and its a white crew cab 5.3 fully bolt ons heads/cam,stall,3.73 gears just bought a 6.0 this past weekend so hopefully that will it will go into the truck pretty soon.