Maximum lift on stock 243s ?
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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.
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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.
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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?
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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.