823 Heads On Lq4, 65 over, basically set this motor up to be as Pontiac GTO 2004-2006 - 6. Specs: 2002 LQ4 bored out 20 thou to 4. 02 Speed Pro h1129cpa . what can i expect to gain Engine has a 222/226 587/598 on 113+2 EPS cam. 3L, 6. From what i have gathered the LQ4 has a 9. They produce 365cfm vs the 243's 325cfm at the same lift. 0L 6. I recently purchased a gen three LQ4 and wanting to build it for about 550 hp street use and If you don't have the 317 heads already, look into 823 heads from the Gen IV truck engines. 630"/. uum, fizk, km, wr, wwd, ft7d, 0i5f, bzm, hvnlu, q4ej6p3, tukpt, u5u, 6pmt5, hz, ahw, thxslkp6, gb, 2nginy, u9nic, gx66, dvhod, xt1xuobd, zlu7cxa6, d67r, zcbb, hbhfa, q2j6, jbu, 29txpu, og73tkc,