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Hi Fred, The 16HP can't take the 20HP carb and intake.....it's just too much for the 480cc displacement. If you can find an 18HP ((570cc) you can simply bolt on the 20HP intake and carb on it and then it's a 20HP Vanguard. If you can find a deal on a 627cc 21 or 23HP Vanguard, you'll have a real monster of an engine that will have more power than you could ever need. Hope this helps!