Not sure what you mean when you say only the single port have twin carbs as i have robbed a few twin port type 3s of there carbs.In standard form there is little to be gained performance wise in fitting them .if you look at the hp figures of the 1600 beetle and type 3 there is only 3hp difference although it does vary from
book to book.Short manifolds do help with icing though .I did this conversion on a twin port 1600 a long time ago and to be honest ,apart from look good it did little to help performance although thats not to say they cant be modified in some way to make them better, with the help of internet knowledge.Are you using the early style fan housing or keeping the heaters ?
Sunroof53 wrote: