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Old 10-18-2008, 11:07 PM
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Overkill?

I have a stock 305 in my 85 Monte Carlo ss and im in the process of removing the computer controlled distributor/carb for mechanical and wasnt sure of what size carb to put back on........the stock carb is a 750 Q-jet.....and i was thincking about replacing it with a holley 750 like the double pumper,that way if i upgrade to a bigger engine in the future I will have all the carb i need....if the double pumper is to big,couldnt i just put smaller jets in it or would that just cause me more problems?


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Old 10-18-2008, 11:29 PM
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The Qjet is flow-sensing, so of that 750 cfm available, the 305 probably only uses about 400 of it.

I would strongly consider just replacing it with an earlier Qjet. Get one from a 305 that isn't electronic and chances are you won't have to do much tuning. A Holley 750 would probably require a good bit of chasing down jetting, and then you'll have a ton of tuning to do with the big carb on a little engine.

The 750 Qjet (since it is flow sensing) is perfect because it will work beautifully on your 305, and will also be adequate for a much larger engine in the future.
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Old 10-18-2008, 11:44 PM
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I have a friend of mine that has a older Q-jet off of a malibu,he had told me that i could have it if i wanted it, but i thought i would just go ahead and buy a new one like the holley....i didnt now they were flow sensative,maybe ill just go ahead and take him up on that and use it....its been sitting for a while in his garage but im sure with a little bit of liquid curage (ETHER) it will come alive!!!!!
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Old 10-19-2008, 01:30 AM
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A 750 dp on a stock 305 will be a pig, waaaaay too big. Get the old q-jet from your buddy, either rebuild it or have it rebuilt by a knowledgeable person. Don't just slap it on and spray a canfull of ether through it, it's probably full of old varnished gas residue, spiders and brittle gaskets.
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