I agree with Gillie that the 140 is a better match for the 20' hull than either of the bigger 4-S motors for the best low speed planing performance and ride. My experience with the Seafari, which is still heavier than the Tracker CC models and with more of that weight forward than in a CC, is that the less weight you have on the transom the better. I ran it for over 30 years with a 300 lb motor on some long Bahama trips in rough conditions and was amazed at how well it could stay with 23-24' boats! With only ~ 100 hp at the prop, I could only cruise at about 20 kts and would have trouble staying with the guys running bigger engines in flat conditions, but once seas kicked up to 2-3', they'd have to slow down and then I could stay with 'em! The ride was just amazing and it's too bad that so many CSC guys have never run the 20' hull with a light motor like Gillie has because they'll never know how well it performs when it's balanced as originally designed!
Regarding the E-TEC's, I believe that the 2.6L V-6, which combines the weight of the 140 Zuke with the power and performance of the bigger 4-S motors with even more mid-range torque, is now the optimum new power option for any of the 20' hulls.
The 130 hp and nearly identical 115HO V-4's that were originally listed at 369/375 lbs wet weight (20/25"models) in 2006 had grown to 390/405 lbs by 2009, but as far as I know, only the 115 was available after 2012. The 115 supposedly had more mid-range torque than the 130 V-4, which was evidently replaced by the 135 HO V-6, which I believe came out in 2013. Since the 2.6L V-6 (in 135HO/150/175/200 ratings) offers 1/3rd more displacement with only 28 lbs more weight than the V-4, most folks would probably pick the 135 V-6, provided cost and fuel consumption weren't significantly higher. The other even lower cost and weight option is the 90 HP I-3 E-TEC at 320/325 lbs which is also plenty of power for the 20' hull if you're not interested in running over about 30 kts.
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