Jegs also has a set of smooth ones by Wysco that are 140 shipped. Both these and the speedway ones state that they have a '2.5" collector'. for an outlet. Can anyone confirm whether the inlets are the same as was original on the 62-63 Vette manifolds? It looks to me like inside the inlets there is a restriction/reduction in the diameter. Did orignal 2.5" manifolds have this reduction? Can someone post a pic of the inlets from an OE setup? Thanks!
http://www.jegs.com/i/Wysco/938/MA03...FUNgMgodInIArw
See this pic from Speedway on the chrome version. The inlet reduces.