Rochester 4 Barrel Carb Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69GMCCamper · 12-04-2004, 03:39 AM

I have a 350 in my truck with a 4 Barrel Rochester Carb. If has been running horribly for as long as I've had it and may have just found out why. I compared it to another truck with the same carb. There both automatics and I noticed I'm missing a piece of metal that runs from the side of the choke and into the manifold. What difference would this (kickdown linkage?)
make in how the truck warms up and idles? Also if anyone has any pictures that would be great. Thanks

Brainchild · 12-04-2004, 04:02 AM

It makes all the difference in the world while it's cold.The heat riser governs how much the choke opens or closes until the engine is warmed up completely.

69GMCCamper · 12-04-2004, 04:16 AM

Yeah I started to wonder when it took 10 minutes to warm up this morning

**Stocker** · 12-04-2004, 11:42 AM

BC is right, cold starts are difficult at best without the choke linkage. Sorry I don't have pics but someone here should post some for you. You may find a small bi-metal spring in the manifold; one end of the linkage goes there. If it's broken, you can get one at any auto parts store. Good luck!

**john** · 12-04-2004, 07:08 PM

Thisis one I made myself, but you get the idea. John

12-04-2004, 03:39 AM	#1
69GMCCamper Registered User Join Date: Jul 2003 Location: Beautiful British Columbia Posts: 28	Rochester 4 Barrel Carb Question I have a 350 in my truck with a 4 Barrel Rochester Carb. If has been running horribly for as long as I've had it and may have just found out why. I compared it to another truck with the same carb. There both automatics and I noticed I'm missing a piece of metal that runs from the side of the choke and into the manifold. What difference would this (kickdown linkage?) make in how the truck warms up and idles? Also if anyone has any pictures that would be great. Thanks

12-04-2004, 04:02 AM	#2
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	It makes all the difference in the world while it's cold.The heat riser governs how much the choke opens or closes until the engine is warmed up completely. __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

12-04-2004, 11:42 AM	#4
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,622	BC is right, cold starts are difficult at best without the choke linkage. Sorry I don't have pics but someone here should post some for you. You may find a small bi-metal spring in the manifold; one end of the linkage goes there. If it's broken, you can get one at any auto parts store. Good luck! __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

12-04-2004, 07:08 PM	#5
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Thisis one I made myself, but you get the idea. John Attached Images __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

12-04-2004, 04:16 AM	#3
69GMCCamper Registered User Join Date: Jul 2003 Location: Beautiful British Columbia Posts: 28	Yeah I started to wonder when it took 10 minutes to warm up this morning



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