serious carb issues

kocuda said
I've been dealing with carb problems for over a week and using the info fellow FABO members have given me is working.
You need to open up the secondarys till you see the slot.
Adjust you primary to lower the idle.
Check your vacuum at idle, sounds like you need to change the power valve, if vacuum at idle is say 6 you need to run a 4 power valve in order to get any adjustment on the mixture screws.
I think you need a little more intitial timming like 17
Good luck carbs can take a lot of time to get tuned, I'm no expert but all the members here have givin me advice that works.

vacuum at idle is good, but i will recheck it...my dad is away on business for a few days, and he's the carb guru...im just learning right now, but these problems are definatly helping me learn faster lol...as far as timing goes, if i want to go higher im going to need to modify the distributor (Mopar performance smallblock distributor) which id rather not do...would the low timing actually be hurting it? even if i was to advance it, then the total would be higher wouldnt it?

JoeDust451 said
If its 4 corner idleing, i would start off with a baseline on all 4 (all 4 even), then go from there, set throttle blades even F&R. Sounds to me that if its stalling after you rev it up, then its going "lean" in the idle curcuit, most likely from the idle mix screws not being far enough out.

the guy who built the carb mentioned that holley's have a real touchy idle circuit, and your comment about the idle screws not being far out enough is exactly right...the driver side primary one is in all the way right now, but thats because if we turn it out at all, even starting with them all even, it dies right away...with it turned in all the way it runs, but hardly

ou812 said
It sounds like you already have holes in the throttle blades? If so, you probably don't need them with a 4 corner idle setup.
I just ran into this on a BBF I built for a customer using his "modified" carb. I could close both front and rear blades and it idles at 1400rpm.
I epoxied the holes up, opened the blades up some and now it idles at whatever I want it to. This was a mild 500HP build, so with a 4 corner idle carb it didn't need the holes in the blades.
That's what it sounds like is happening with your carb to me anyways....
Brian

Brian, i posted this same question on another forum and got a similar response as yours...he said that as far as he knows there was never a 750 offered that has holes in the blades except for annular booster carbs, which mine isnt, and he said i have a problem on my hands...my dad said the same thing, and you are saying it too...i have emailed the guy who built it telling him about this and im waiting for a reply, so we will see what he says...this is really frustrating me right now