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78 chevy truck 10-22-2004 11:50 AM

i have a holley 750 part number 0-3310s and i am haveing a problem with sucking from the carb there are no vacume leaks and it runds good after idle. i have set every thing with a vacum gage and i get 15 i thing it mite be my power vavle the cam i have is a crane 274 218 at 50 and 450 lift and a 300 intake and exaust with a 106 lobe sep i think i am not get enough air at idle i dont know i need help

MI2600 10-22-2004 01:10 PM

If the power valve is bad it will run rich.

I don't fully understand the sucking sound you described. Is it like a low whistle? If so, it may be you air bleeds.

78 chevy truck 10-22-2004 04:52 PM

ya kinda its like its not getting any air

4 Jaw Chuck 10-22-2004 05:58 PM

Can you be more specific? The number you listed is the model # of the carb not the part #, can you give us the part #? What you do next to the carb is dependant on this information.


78 chevy truck 10-22-2004 10:27 PM

primary jet 72 secondary jet 75 pump discharge nozzle 0.031 primary power vavle65 secondary diaphragm spring silver

it sounds like old qjets sucking sound its kinda loud

4 Jaw Chuck 10-23-2004 01:38 AM

Part # is on the air horn.;)

78 chevy truck 10-23-2004 04:17 PM

where is that

troy-curt 10-23-2004 04:26 PM

The part that sticks up above the body of the carb. and has the choke butterflys in it, there should be numbers on the front of it.


78 chevy truck 10-23-2004 05:07 PM


4 Jaw Chuck 10-23-2004 06:29 PM

Should be some other numbers there, can you post those?

lluciano77 10-23-2004 11:48 PM

It is a 3310. The important question is 3310 dash what? 3310-1,
3310-2? Holley made different carbs under the same list number. They assigned them revision numbers. Sometimes they changed the fuel curves or calibration between revisions..

78 chevy truck 10-24-2004 02:32 PM

its 10 the engine is a 350 bored 60 over the sound goes away when you hit the gas. and there is vacum on the ported sisde on the carb for the hei. it moves the timeing 2 degrees i think

what are the factory settings for the mixture screws arnt they 1 1/2 turn

troy-curt 10-24-2004 03:49 PM

You set the mixture screws to where it idles the fastest and the smoothest.


78 chevy truck 10-25-2004 12:49 PM

any more ideas

troy-curt 10-25-2004 08:20 PM

Is it cold there yet? The last time I was there 98 I think, for the world of wheels show, I froze my nads of, dang it was cold.


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