Maximum lift on stock 243s ?
01-22-2008, 09:51 AM
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Maximum lift on stock 243s ? What is the optimum lift that the untouched 243 head can use on the street through stock intake and exhaust manifolds? I am on the fence between the LPE GT11 or the TR CheaTR in my 05 GTO. Looking for stealth and best power.
Last edited by DV327; 01-22-2008 at 02:25 PM.
01-22-2008, 11:52 AM
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if your talking about springs/ lift i wouldnt go over 570 lift on stock ls6 yellow springs. if your talking about at what point would the valves touch the pistons i dont know , call TSP or patriot.
01-22-2008, 02:24 PM
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Thanks for the reply. I know that I will have to change springs. My question is how much lift can the stock head use? Does air flow diminish at .600 lift or can they effectively use more lift?
01-22-2008, 04:51 PM
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whatever your springs can handle, but a stock LS6 casting intake peaks around 260CFM at .550 lift and back flows after that. Exhaust peaks at 195CFM at .600 lift and gains very little after that.
