I'm going to switch to the under the carb vacuum port on the 750 DP Holley, and use that as my vacuum source for all subsequent tests. If the next Streetmaster test shows high vacuum also, I think we can safely conclude that the carb is a restriction. At which point I'll swap on the 850, and see what happens...
Jay Brown
1968 Shelby GT 500 Convertible, all aluminum 489" 1030 HP Supercharged FE
1969 XL Convertible, 460
1969 R code Mach 1, 706 HP 511" all aluminum FE, 10.457 @ 127.47, 2005 Drag Week Winner, Naturally Aspirated Big Block
