Tom
My 850 Annular Mighty Demon has provision for a secondary power valve but comes plugged (as all cars that leave resonably should do as you stated)
Jetting std is 80 up front and 88 rear so jetting is staggered to account for PV
Anyone out there have a 750 VS Speed demon
Was working on one today for a friend on a (gasp) 360 mopar and the secondaries would open when "winging" the throttle in neutral with a brown (heavy) spring in it. (accompanied by a bad midrange bog)
My previous experience with Holleys lead me to think maybe the check ball in the vacum pod had been left out. Upon dissassembly there was no check ball-slot nor the later style pressed in brass restriction with a drilled hole (0.038" on the old Holley one sitting in front of me). The passage is around 1/4" in diameter?????.
They (BG) also state the exact starting opening points and full open points as the holley VS models for the different spring colours which is fine except that the installed height of the springs is some 4mm greater in the Demon causing the spring to be preloaded less ????? (ie Earlier opening point)
Unable to figure out how this could be I emailed BG and got a one line reply stating "based on the orifice size going through the main body we do not use a check ball in our vacuum pods." yet the pick up in the main body looks the same as in the old 750 Holley the demon replaced!!! The Holley uses a checkball-slot and runs like a cut cat with a yellow (light) spring
If anyone has a VS demon that runs well
could they please check if it has a pressed in brass restrictor in the vacum passage in the main body of the vacum pod like the old Holleys
Thanks in advance
Working on going faster!!!