My car has been running sluggash since my rebuild and I called the guys at Summit Tech, they said to check the vacuume and adjust it by 2". So I put a vacuume gauge on the carb (Holly 650 Double pump 4bbl) and I have NONE!!
Please help guys!

 

put your gauge on a intake port for you vacume check

 

Well that sucks, or not...haha

Ok, if you're checking vacuum you need to hook the gauge up to the baseplate of the carb, not the metering block. You probably hooked it up to ported vacuum which only shows vacuum a bit off idle. That is used sometimes for vacuum advance or the charcoal cannister.

You can't necessarily adjust your vacuum. What you can do is adjust your idle mixture for best vacuum (highest steady reading). First start by making sure your mixture screws in the metering block are both turned the same ammount out. Turn one screw in lightly until it just stops while counting the turns. Turn it back out the same number of turns. Typically this will be from 1 to 2 1/2 turns depending on your setup. Do the same to the other side. If there is a difference between the two split the difference between them for a baseline setting. Start the engine with the vacuum gauge connected at the proper baseplate port and very slowly adust one screw in or out to find the highest steady reading and stop. Move to the other side and do the same. Your idle speed may and probably will increase. Adjust the curb idle screw back to your target idle speed and go back over the mixture screws again. More than likely your vacuum reading will have increased. I may turn both screws out 1/8 turn after this setting for a better cold idle.

A proper idle mixture will help off idle, but not heavy throttlle. Check ignition timing with the vacuum cannister disconnected before starting the idle mixture setting.

 

i was gonna be a smarta$$ and say go to walmart or sears and buy a new vacuum, just i dont know why you need one in a car?

lol, yea you can't really adjust vacuum, it's caused by cam and heads and driven by your pistons so, only way to 'adjust' it would be to rebuild the motor again, however the way to tune a holley is like markink said

 

my cam is 1 degree advance, would that make a difference?

 

no.

 

OK I used the butterfly and barely gave it throttle and it jumped to 10", but at a steady idel with no load it stays at 0

 

You're still hooked up to ported vacuum.

 

****, i'll try the other port on the carb

 

just tried the other port on the carb and with a little throttle, i get 10"

 

How much with no throttle? Just idling...or will it idle at all?

 

0 with no throttle. idels great!

 

keep searching for a better port to plug into.
You have to have some vacuum off idle, or the engine wouldnt be running;

 

OK here was the deal, 3 completly smashed spark plugs. Not just hit or grazed by the piston but ******g layed over So new plugs fixed it and she runs like a raped ape.. thank you to all that helped!!!

 

Now how would that have happend?