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Author Topic:   Rochester Q-Jet?
fairlaniac
Dirt Maniac

Total posts: 110
posted January 24, 2004 07:35 PM  
What 4bbl Q-Jet is a good one for running in an Enduro series (200 lappers)? Any good recommendations on modifications. Rules state that all GM's to run Q-jet.

------------------
Doug
"Lift for a second, that's where you'll finish!"

dan ferry
Dirt Maniac

Total posts: 183
posted January 25, 2004 07:47 AM  
for the enduro class id say any one that works well that doesnt look as thogh its been sitting around for years witout aircleaner on stay away from the electronic ones theyll have a couple plugs on them.there are a few sizes of older carbs but you have to measure theventuri area to be exact on the cfm of carb but i think fir you any non computer controlled will do fine.as lond as its in good shape. if you plan on staying with it you can go to advance or your local parts stores and order a reman Qjet for less than 150 and jetting would probably be ok for a stock 305 or 350 ill try to find the part number on the one webought and used on one of our cars it is 750cfm i believewoked great outta the box but i did some changes in secondary area

fairlaniac
Dirt Maniac

Total posts: 110
posted January 25, 2004 07:55 AM  
We're kind of looking for one that will run well on a "gray area in the rule book" engine.

Thanks,
Doug

[This message has been edited by fairlaniac (edited January 25, 2004).]

dan ferry
Dirt Maniac

Total posts: 183
posted January 25, 2004 08:46 AM  
yep buy the rochester book outta summit. but im sure a 750 will work if your not turnin 7000 rpm too much carb kills low end even jetted right dont get me wrong i have a couple of the big Qjets and they work great but i turn the one motor 6200 or so and have over 500 lift and 292 adv duration but the smaller carb works as well on it to jus had to change secondary hanger from the other engine setup

dan ferry
Dirt Maniac

Total posts: 183
posted January 25, 2004 08:47 AM  
i/m kp lugnut or go on his site kinetic pereformance hes into Qjets

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted January 25, 2004 10:15 AM  
Actually, I hate the darn things, but we tend to build some killer quads anyway. LOL!
All info above is right. There's only 2 different actual cfm ratings for stock quads. The vast majority were 750cfm carbs with a few being 800cfm (overkill for most classes that make you run a quad).
Give me a shout, I've got cores in stock (too many, in fact), and can build you anything you want.

Thanks for the recommendation, guys...

Dayton Umholtz, co-owner
Kinetic Performance http://www.kineticperformance.net

ps. - Rochesters are NOT all we do, btw. We build every flavor of Holley as well, and can supply head machining, intake work, carb spacers, and flowbench work as well.

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