Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Fine tuning Q-jet
bob69:
The 200r4 discussions reminded me of the tests I did following the install (many years ago). I did a few tests with changing gears manually. At the time, the engine/trans would rev easily to 5000 in second and third. The engine was replaced when it developed low oil pressure problems.
The engine was replaced and same q-jet was used on both. The q-jet still had some of the same problems that were identified earlier in this post. Except this time I had no performance. If I had remembered that the q-jet did perform in the past, I may have identified the problems with "new" fuel pump and gas tank sock sooner. Live and learn......
Cliff Ruggles:
Fuel delivery is a BIG deal when it comes to tuning. I get all sorts of calls from folks wanting richer secondary metering rods because they are having high RPM issues with the engine going flat or loosing power.
Just had a customer in here a few days ago that had his carburetor "professionally" rebuilt/restored and it wasn't up to par for his big block Chevy 396 engine. I removed the airhorn and low and behold it had a .110" N/S assembly in it. That wouldn't keep up with a decent running 305 SBC let alone his "warmed over" 396!
Last time I looked it was 2022 and I wonder why folks rebuilding/restoring these carburetors continue to install the WRONG parts in them then blame the carburetor for not being good enough or big enough for what they are doing?............Cliff
von:
--- Quote from: bob69 on May 19, 2022, 09:50:56 AM ---Von, were you able to confirm the valve body was coded CRG? And did the valve body have pink paint on it. The pink paint identifies the valve body as the monte carlo HP vb. It was used on CZ and CR transmissions.
I've read that the "pink" CR VB can be can be easily upgraded to CZ SS specs. Like modifying the governor to increase rpm shift points.
--- End quote ---
I found some pics I took when I had the trans disassembled for rebuild. The VB had CR something on it but the third letter or number was hidden. I didn't see any pink paint. The trans is from an '86 Monte Carlo 305 NON SS.
77cruiser:
Too bad you couldn't round up a CQ or CZ valve body. They have around 5000 to 5300 with a GN gov.
bob69:
Von, well that makes things more complicated. All of the posts I've read about the 1986 monte say the CR vb is made with the same basic core vb used in the CZ. The CR vb can be made to perform like the CZ with minor mods like changing shift springs, line pressure and the governor to the CZ piece. The govenor mods you made should have result in some rpm increases.
What's confusing is that performance vbs in 1986 monte were marked by GM with pink paint and you say yours was not. Now I wonder if the changes I planned to mine will be worth it.
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