Visit The Dirt Forum for More Information

Author Topic:   Another Quadrajet question
51racing
Member
posted June 10, 2004 09:06 AM
With so many variables there, it's likely more than one problem happening, but in general, the rule of thumb is a smaller rod in the same sized jet will richen up the carb noticeably, with all other things equal. Of course, I'm assuming we're talking about the primary rods here, and not the secondary metering rods as they are not coming into play at idle (or shouldn't be).
After the fire, or during it, you may have ruined the power piston spring under the primary rod hanger (power piston) and it also is affecting the timing and lift rate of the primary rods. The same goes for the secondary air flap spring.

You might try about a 68 jet with those smaller rods in order to accomplish a similar fuel flow as the 71 jet with bigger rods....of course, that's a wild-hair guess.. :-)

Hope that helps,
KP


51racing
Member
posted June 10, 2004 10:30 AM
I have 'em.... :-)

follow our scrolling link at the top of the page, and contact us from there.

KP

51racing
Member
posted June 10, 2004 01:47 PM
You can still but Q-jet jets new from GM. Have someone that knows what they are doing look up the partnumber for the main jets from any early 80s q-Jet. The last two numbers in the part number are the jet size. Take what ever number they come up with for a part number and change the last two numbers to the size of jets that you want. The largest GM jetsize is 78.


Back to the Archives