wsm9808, we have a 1992 20 Carrera Eclipse in the shop right now with a genV block w/tunnel ram twin 600's. Haven't tested the boat yet [it's 3 degrees C right now],but will know more about it's performance in the spring.Previous experience told me little benefit over a well setup single carb.However a tunnel setup looks cool in an open boat like this carrera.Will do a side by side run with the 19 spectra [460 BBF singlecarb] and carrera 454 BBC tunell ram twin carb] http://www3.telus.net/spectrasonly/1...19spectra5.jpg