Quadrajet Problem Solving > Quadrajet Parts and Numbers
Original carb specs 7045214
Mudsport96:
--- Quote from: Ethan1 on March 06, 2016, 06:23:41 AM --- Just to clarify, it used 39B Primary Metering Rods. Not 39 Primary Metering Rods. And it also used the "K" Secondary Hanger as well from the factory. 8)
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And I thought I was being sneaky copy and pasting from the rod and jets thread in the Talk and tips section. Lol
Ethan1:
--- Quote from: scrappy on March 06, 2016, 07:35:14 AM ---"b" rods are used only with APT in the throttle body correct? And these are different than the rods used in the 170 series carb that had the APT under the air horn.
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That I am not sure about. Does your throttle body have the plug in the front of the throttle body for the APT?
Ethan1:
--- Quote from: Mudsport96 on March 06, 2016, 07:44:11 AM ---And I thought I was being sneaky copy and pasting from the rod and jets thread in the Talk and tips section. Lol
--- End quote ---
Not being sneaky at all. You are on the right track! Lars just didn't include the suffix after the primary metering rods. Why, I don't know. :)
scrappy:
Yes, it had a plug in the throttle body. I removed that back in 1980, and "adjusted' it LOL.
We did get this fired up today. Ran it @ 2500 to break-in the valve train. When I closed off the airhorn with my hand it did pick up RPM. So at least the part throttle is on the lean side.
Still have to get it set to road test. The idle seemed kinda rough, will play around with initial timing/ vacuum advance. It does not seem to like manifold vacuum or 13* in the can is too much.
I looked at the hanger and metering rods, yea they are not stock...Must have 'adjusted that' too.
scrappy:
Update after checking with wideband 02.
Out of the box, this thing runs great no hesitation or bog.
Idle 11 to1 and able to set to 14/1
Lite throttle 18/20 to 1 The APT is full rich, it was as high as 22 to 1
Full throttle on the primarys with the secondary locked out dips into the 9/10 range.
Full throttle with the secondary's 10/11 range.
primary rods are 48b with 77 jets.
Sec rods DR
PP opens @8 in and seems to be a good opening point, 02 sensor verify's that it goes fat
stock rods are 39b with 71 jets and those are long gone...
so any advice as what to get this one back on track?
the build is
355 sbc Stock Vortec heads 9.4 CR factory manifolds 3.27 gears 27 in tire T-350 trans
Mild Lunati roller cam
Advertised Duration (Int/Exh): 272/282
Duration @ .050 (Int/Exh): 206/216
Gross Valve Lift (Int/Exh): .447/.447
LSA/ICL: 112/108
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: Idle-4800
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