706 casting 5.3 Heads on NA LS1
05-06-2011, 01:34 AM
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706 casting 5.3 Heads on NA LS1 Is there any advantage in running Stock (non-ported) 5.3's (#706) on a NA LS1 with stock cam/internals and basic bolt-ons (lid, headers, LS6 intake, etc) over Stock (non-ported 241's. Would the only advantage be an increase in compression? Would there be a dyno RWHP and/or Torque increase? What should I expect to pay for used stock 706's. What is the main application for 5.3's on the LS1 engines?
05-06-2011, 03:38 PM
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You would want to at least get the valves changed out to a stock LS1 valve size. Stock they are smaller and will give up some flow. The compression boost is nice but without the valves I feel like you might be taking a step back. We do a lot of porting on 5.3l heads and make sure to always put a larger valve in at the same time.
05-06-2011, 03:53 PM
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About how much would it cost me to have you port these heads and replace the springs with single springs? Or, is it better to do a core exchange for your ported 5.3's?
