I don't recall the question but the primary difference is in the first gear ratio which in turn affects the torque capacity. TKO 500 uses a 3.28 first gear while the TKO 600 uses a 2.89. The TKO 600 has closer ratios as well. No brainer choice here since they both are very close in price.
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71 Formula 433, Splayed cap 400 block, 4" stroke Scat forged crank, 6.8 Eagle rods, custom Autotec pistons. SD 295 KRE D ports, Old faithful hybrid roller, Torker II, Holley Sniper Stealth, Tribal Tubes, TKO 600, 3.73 Eaton posi.
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