General Category > Quadrajet Carb Talk and Tips

Airhorn vent

<< < (2/2)

mcx:
Cliff...I checked the 7042211 base plate numbers against another 72 7042210 and it's the same stamping/serial number...I also matched the two main body and  checked the specs and they are the same jets/rods/bleedsize/ect... So it's definitely isolated to a incorrect pre 70 airhorn...Cliff, do you see any issue with using a pre 70 non- notched gasket and let the idle air bypass flow as is.? The pre 70 idle air bypass takes a slightly different path through its airhorn, but its fed identical.

Cliff Ruggles:
It's probably 1968 or earlier as many Chevy units didn't use bypass air so the airhorns aren't notched.

Just take a die grinder and gently notch the airhorn and use the later gaskets, they aren't fussy and I do it all the time here. 

As far as calibration I'd either install the small bleeds in the MAB locations in the main casting and calibrate it like a pre-1970 or take them out and run all four as large MAB's and calibrate it like a 1970-up unit.

The mixing/matching thing just doesn't work for me and it didn't work for Edelbrock either as they left the small MAB's out of the main body on their early style units but put them in the airhorn.  I install a set in the main body on every one we do here and it gets them right up to par every time......FWIW......Cliff

mcx:
Thank you Sir...very much appreciated.

Navigation

[0] Message Index

[*] Previous page