Dellorto VHB 30 carburetor fitment
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
Thanks to Charlie Mullendore of Antietam Classic Cycle for providing the following information on the old Yahoo! Loopframe_Guzzi news group (which has now moved to Groups.io). In Charlie's own words:
VHB 30s with stock Eldo jetting should work fine. The extra 1 mm larger throat diameter makes very little difference in my experience. However, the 30s won't just slip onto the 29 manifolds - the plastic sleeve of the 29s and 30s are different. The plastic sleeve of the 29s is 35 mm ID × 40 mm OD and for the 30s is 37 mm ID × 40 mm OD You'll either need to use the manifolds that came with the 30s or swap the plastic sleeve from the 29s into the 30s.