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LS1 gen 3 5.7 litre 300rwkw head package 290 cfm CNC ported and recon heads come as a pair with standard factory springs they can be upgraded to crane springs at extra cost. can be upgraded with FERREA stainless valves at extra cost.  exceptional flow at low lifts with a small port will give the best low down torque and still have plenty top end power. unlike most cnc ported heads with huge port size to give big flow numbers at high lifts. these heads have been developed to maintain max. flow at low lifts and dyno results show this caracteristic to be worth while. they are fully reconditioned using multi angle valve job and resurfacing with new seals. they are ported and come with flowsheets.