[jimf]

I have watched this thread with great interest as a while ago I bought a weber 48 ida conversion set up for my 393 W stroker. I plan to install it soon. Before I do install it, I am changing the 37 mm chokes to 40mm right away as this engine is built to breath. One thing I am curious about is when you change to larger chokes would you not also have to change the auxiliary venturis to a larger size. I have seen no mention of doing anything with the axiliary's. Although there is not a great selection of auxiliary's there is one size larger (5.0) than what is in there right now(4.5), just wondering if anyone has changed any of these and what the results where.