My carb is different from the one pictured in my '77 factory service manual
(I guess it's a later design w/ a different accelerator pump and no external positive throttle return spring).

Question is when when were those modifications introduced?

'78 was a transitional year for vans and the '77 production ran longer than previous years.
Sounds plausible that at some point Chrysler ran out of '77 carbs and started using the later model.
Am I right? I do hope I have the original carb in my van

Also if anyone is kind enough to provide me some scans of a later FSM depicting the model I have (design and service procedure) I would be grateful.

_________________
"Hey, I like that paint job you got. What they call that--sorta a cross between Piss Yellow and Puke Green, ain't it?" -- Bob Falfa

‪Uh-oh‬.

That means december 79, right?
Not as stock as I thought, and the idle limiter cap is missing
Should I start worrying?

_________________
"Hey, I like that paint job you got. What they call that--sorta a cross between Piss Yellow and Puke Green, ain't it?" -- Bob Falfa

OK, I didn't find any part number to confirm this, but I think I'm dealing with a '79 - unknown history/don't know why it was put there- '79 passenger car carburetor

According to the pics I found on autozone.com, accelerator pump is not even set correctly for manual trans:


I guess it explains the flat spot I have when accelerating from stop.

Any chance I can make that thing work correctly with my van and tune it for better mileage?
Should I finish rebuilding it or start looking for something more efficient?

Anyone with a '79 factory service manual or knowledge willing to help?

_________________
"Hey, I like that paint job you got. What they call that--sorta a cross between Piss Yellow and Puke Green, ain't it?" -- Bob Falfa

First picture not real clear, But looks like 4179078 chrysler no. Runing production change approximately February 1, 1980. Passenger cars with automatic transmission,Federal and Canadian and International emission package.With AC or electric backlite [electric solenoid idle stop]. 225 engine. 9329 holley no. 1980 chrysler pass. car 225 eng. AT Canadian emission 64.2 main jet

Third picture looks like pump plunger cup is gone. http://www.napaonline.com/Catalog/Catal ... 0177403556 Or similiar.

Holley Close limit jets are 3 digit for tight metering tolerences...

That's a 642, similar to a #64...#641 is lean, #642 is middle of the road, #643 would be on the rich side of a #64 jet...

In comparison 1974 Holley 1945 for cars came with a #58, and Holley 1945 in 1976 cars came #612....

-D.Idiot

Yep, I removed it.

Bought a Walker kit thinking I had the original carb and a complete cleaning and rebuild would help solving the hesitation issue and improve mileage a bit.
Started to tear it down until I had the feeling that something was wrong.

Maybe throwing more time and money at it isn't such a good idea if I'm not able to make it work properly (except maybe for learning purpose).

Thanks for the info guys.

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"Hey, I like that paint job you got. What they call that--sorta a cross between Piss Yellow and Puke Green, ain't it?" -- Bob Falfa

Hey guys,

Can someone enlighten me on what exactly were the flaws with '74-'75 1945's that made them weaker than later models.
Can they be corrected with proper tuning and re-jetting?

I might have found a 74 carb with all the setup for manual trans,
but if I also need a 76+ auto core to make a proper working carb it might not be such a good deal

So, if by chance someone has a 76-79 (non remanufactured) rebuildable unit that he won't use,
I might be interested (I'll have to check what cross-border shipping costs would be though).

Thanks

_________________
"Hey, I like that paint job you got. What they call that--sorta a cross between Piss Yellow and Puke Green, ain't it?" -- Bob Falfa

Some 74's like mine came with a 58 jet.
I put a 61 in it and it was fine.

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG