Velocity Stacks for Dellorto's most popular carburators of the 1960's, 70's and 80's. Click on photo for more info. Dellorto Clamp-on Stack, PHBH 30-36mm Fits 38mm Flange Regular price: $44.95 Sale price: $22.95 Dellorto Long Clamp-on Stack, Fits 46mm Flanges Regular price: $44.95 Sale price: $22.95 Dellorto Clamp-on Stack, PHF/PHBE 30-36mm Fits 48mm Flange Regular price: $44.95 Sale price: $22.95