Re: [Chevelle-list] Sorta OT: Carb Recommendations

[Devin]

Larry-  Sounds as if you have a vacuum leak, probably in the carb itself.  YOu can adjust it all over the place, and think it's right, then nest time it's totally different.  Question:  You said this was a store-bought rebuild.  Do you remember who the manufacturer is?  I deal with 3 on a regular basis, and have far fewer problems with one than the others.   My memory is that your 70 should have an automatic choke already, a choke stove off of the exhaust manifold hooked to your choke plate on your carb.  I think manual chokes were last used in the late 50's.   All my 6 cyl speed parts are gone these days...nothing but fond memories....my little 64 ChevyII wagon surprised quite a few   Devin ----- Original Message ----- From: Larry Shouse To: The Chevelle Mailing List Sent: Monday, October 02, 2006 8:38 PM Subject: Re: [Chevelle-list] Sorta OT: Carb Recommendations Devin,   Basically, I'm having intermittent problems with the one I have. I have recently replaced both intake and exhaust gaskets, including the one that goes in between the two, and bought a parts store rebuilt 1 bbl Rochester. I have the following issues...   1. fuel/air mixture - I can adjust it, and over a week or so, I end up rich again. 2. idle - sometimes it idles fast, and can't be adjusted down, and other times, it idles fine. 3 spits and sputters when I accelerate when cold, or until the engine fully warms up   Because of these reasons, I just want to replace the carb once again - but want something with automatic choke, either electric or otherwise. When running right, this 250 runs plenty strong for me, I just want a card that's well mannered and reliable, and the first two Rochesters I've been involved with has been a hassle.   Of course if you have headers or intake for my 250, I wouldn't mind trying to talk you out of it...LOL   Larry -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Devin Sent: Monday, October 02, 2006 11:22 PM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] Sorta OT: Carb Recommendations Larry-  Why do you want to replace your carb?  Having built a few Chevy sixes, stock to wild, and spent some time with the gurus at Clifford Performance, it is possible to adapt other carbs to the stock manifold, but not worth it for performance purposes.  The most you'll gain is about 5%.  I've put (gag) pinto 2bbl carbs on with the thought of better driveablilty, but actual improvement was little, especially for the amount of adapting involved.  I've also seen 350 cfm Holley 2bbls used, same scenerio, but they are not progressive, so it makes throttle response worse.  I've had best success on built up engines with either Clifford's 4 bbl manifold and a 390 Holley, or my first home-made setup, 3 stock 1 bbl carbs each on their own individual runner to the intake port.  I had a bunch of time in that setup, and tuning was a nightmare, but it ran like a scalded ape from about 4000 rpm up.......until I ventilated the block.  Not of much use in your truck anyway.   Devin ----- Original Message ----- From: Larry Shouse To: Chevelle List Sent: Monday, October 02, 2006 6:08 AM Subject: [Chevelle-list] Sorta OT: Carb Recommendations Hi Guys,   I would like to replace my carb with another one or two barrel carb on my in-line 6 cyl. 250 cid engine, a 1970 model. I would like to put something on it that would plug and play, with either an automatic choke where the spring and rod setup on my manifold would hook right up, or comes with an electric choke I can wire up (preferred).   This application is my 1970 GMC Truck. I appreciate your feedback.   Larry Shouse