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Old 05-19-2011, 01:16 AM
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Quadrajet info needed

I have a hp 300 engine. I have read that Quadrajet made carbs with a smaller primary bore for smaller engines, 1 1/8" diameter.

Does anyone know what vehicles these came on? Engine sizes?

Thanks for the help.
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Old 05-19-2011, 03:59 AM
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Old 05-22-2011, 03:31 AM
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Without going with the 800 cfm q.j., there are two cfm models I am thinking about using. I should say I have a h.p. 300 4.9L (305 cid) in my truck, with the horse power of a stock 2v 390.

I am looking for opinions here. Would I be better off using the smaller q.j. with the 1 1/8" bore primaries, from a 4.3L engine, rejetted, or going with one that came off a 305 chevy in a truck, with similiar displacement, pulling weight. The larger Q.jet has the 1 3/8" primary bore. I am hoping to get better mpg around town, but great power when I stomp on it.
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Old 05-22-2011, 04:07 AM
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THE SMALLER ONE WOULD BE THE BEST , MY OPINION ! the 300 is not as high revving engine as the 305 is and would not need all that extra air/fuel !
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Old 05-22-2011, 10:29 AM
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All the QuadraJet Information I have found on the Internet
Here is some great info on the Q-Jet.
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Old 05-22-2011, 02:19 PM
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IMHO i would not go with quadrajet, ive tried rebuilding one, heck even cleaning the screen out is a pain in the ****
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Old 05-22-2011, 03:46 PM
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you would probably be fine with the 800. just jet it down. even the 800 can get great milage. dont let people convince you its a pos, because its above their skill level. the qj is one of my favorite carbs. if you stay out of the secondarys, you will get great milage.
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