Rochester 4 barrel carb question. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 08-20-2004, 12:25 AM

Is there a difference in the rochester 4 barrel carb (4mv) for a automatic and manual transmission? If so how whats the difference?

Thanks

skokie · 08-20-2004, 02:07 AM

Ttt

*1972C10* · 08-20-2004, 04:10 AM

I woudlnt think so if there is its prolly just on the throttle plate where everything hooks on like cruise kickdown etc.

GMC AMI · 08-20-2004, 05:25 AM

Hi, they are the same, only autos have the kick down linkage.

68C15 · 08-20-2004, 08:05 AM

very slight calibration difference. you may not notice it.

skokie · 08-20-2004, 12:39 PM

Thanks Mike and 68c15. I will keep hunting for the auto version since I have a auto tranny. No rush here its gonna be a while before I can build the 327.

72C203503ONTHETREE · 08-20-2004, 04:53 PM

I have swapped many Q jets around, there was no differences at all that will prevent you from bolting either version on either engine/tranny combo. Chevy used the same carbs but just added a connection for the kickdown cable in an allready available hole in the throttle arm. Ford was bad about that, you had to have a auto trans carb to work on a auto trans car/truck.

skokie · 08-20-2004, 04:55 PM

72C3203503ONTHETREE
Thanks for the info. You wouldnt happen to have a pic of that connection piece for the kickdown cable would you?

Thanks

skokie · 08-22-2004, 12:15 AM

Does anyone have a pic of the auto tranny kickdown linkage?
Thanks

72C203503ONTHETREE · 08-22-2004, 09:28 AM

No pictures, sorry. You can make one yourself if you cant find one in a junkyard. There should be plenty on any chevy truck, they used mostly Quadrajets or Rochestor Dual jets(just the primaries of a quadrajet).

08-20-2004, 12:25 AM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Rochester 4 barrel carb question. Is there a difference in the rochester 4 barrel carb (4mv) for a automatic and manual transmission? If so how whats the difference? Thanks

08-20-2004, 05:25 AM	#4
GMC AMI Registered User Join Date: Apr 2004 Location: The Other Maine! Posts: 2,236	No diff. Hi, they are the same, only autos have the kick down linkage. __________________ 1968 Chevy 4x4 307 4 speed

08-20-2004, 08:05 AM	#5
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	very slight calibration difference. you may not notice it. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

08-20-2004, 04:53 PM	#7
72C203503ONTHETREE Registered User Join Date: Apr 2004 Location: Grant, Alabama Posts: 504	I have swapped many Q jets around, there was no differences at all that will prevent you from bolting either version on either engine/tranny combo. Chevy used the same carbs but just added a connection for the kickdown cable in an allready available hole in the throttle arm. Ford was bad about that, you had to have a auto trans carb to work on a auto trans car/truck. __________________ 72 Chevy C20, SOLD (Dang it.) 09 Challanger RT six speed in all black. 74 Datsun 710 wagon, all 1.8 liters of screaming Datsun power. 73 C10 long bed, 350/350 combo, nice shape.

08-22-2004, 09:28 AM	#10
72C203503ONTHETREE Registered User Join Date: Apr 2004 Location: Grant, Alabama Posts: 504	No pictures, sorry. You can make one yourself if you cant find one in a junkyard. There should be plenty on any chevy truck, they used mostly Quadrajets or Rochestor Dual jets(just the primaries of a quadrajet). __________________ 72 Chevy C20, SOLD (Dang it.) 09 Challanger RT six speed in all black. 74 Datsun 710 wagon, all 1.8 liters of screaming Datsun power. 73 C10 long bed, 350/350 combo, nice shape.

08-20-2004, 02:07 AM	#2
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Ttt

08-20-2004, 04:10 AM	#3
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	I woudlnt think so if there is its prolly just on the throttle plate where everything hooks on like cruise kickdown etc.

08-20-2004, 12:39 PM	#6
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Thanks Mike and 68c15. I will keep hunting for the auto version since I have a auto tranny. No rush here its gonna be a while before I can build the 327.

08-20-2004, 04:55 PM	#8
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	72C3203503ONTHETREE Thanks for the info. You wouldnt happen to have a pic of that connection piece for the kickdown cable would you? Thanks

08-22-2004, 12:15 AM	#9
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Does anyone have a pic of the auto tranny kickdown linkage? Thanks



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