Absolutely correct, and why most won't take the time. But the reward and fun is unmatched. I remember years back we worked with a slant six in a '72 Duster. Using all stock slant components but the added 2bbl from a super six. At first, my '91 3.3 V6 Dynasty smoked it bad. But by nothing else but tuning, this slant ended up smoking the Dynasty real bad. By many car lengths in the "marked off 1/4 out of town". The Dynasty ran 17.27 at the strip. Though the Duster never made it to the track to get an ET slip, I'd guess it minimum of low 16's but maybe high 15's more realistic. We probably tuned 1.5 - 2 full seconds out of a "good running slant six".