Thread: 1st lumpy idle build, and cards I've been dealt

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Of course they do Tango -

Chevrolet 262-400 Small-Block V8
PERFORMER RPM Q-JET (1500-6500 rpm)
Designed for 1955-86 262-400 c.i.d. Chevy V8s for spread-bore (Q-Jet) or square-bore carbs. Delivers maximum power and a broad torque curve for high-performance street. Carb pad will accept square-bore carbs without adapters. Performer RPM Q-Jet has same provisions as #7101 (see above). Will not fit under stock Corvette hood.

The Weiand Stealth is square flange only, however; the 8004 "Avenger" is a dual plane spread bore mainfold.

The Q Jet has been used in very small displacement motors to big blocks right from the factory. The Small primaries allow this. SMI (Sean Murphy) has his QJ's on cars for stock appearing drags class running in the 10 second range. For a street car the carb is hard if not impossible to beat. The comment that lets hear the down sides to QJ's..there really arent any expect they require more knowledge to rebuild and tune properly. Im with Tech...for a primary street car ...anywhere from 265 to 496 you cant beat one set up correctly. JMO.

Im sur eoyu have noticed the engine should run with what you have but definately isnt optimum for a low compression smog head engine with a stock stall speed and rear gears

Originally Posted by tango

That is also a non-Air Gap intake ? More HP and Torque then any other intake Idle to 6000 ? Yes Q-Jets are good . Lets hear the many Down Sides to the Q-Jet and other Spread bore Carbs ?

What are Down Sides to this Super Great Carb ? And with Spread Bore Intakes / Carbs ??

As Post Edelbrock #7101 not an RPM Air Gap Intake . Also the Weiand #8004 intake is a near Match to the Early #2101 Edelbrock Non-RPM Performer . Also Non-Air Gap Intake .

This one is for all the Math Hot Rodders ? I would say that most every Tech ? Helper here has and still says 600 CFM is all the Carb that you will need for any Hot Rod 350 Chevy ? Is this not a Problem when using that Big 750CFM Q-Jet ? Is the Math wrong here ?

Small primaries and great big secondaries...changes the CFM requirements a bit. A well tuned Q-Jet on a mild engine will get respectable fuel mileage and still give good performance when the secondaries come on....

Q-Jet intake for an SBC---another consideration would be the Weiand Warrior....Never ran one, but most of the Weiand stuff performs quite well....