[Chevelle-list] Sorta OT: Carb Recommendations

[Larry Shouse]

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: Chevelle-list-bounces at chevelles.net
[mailto:Chevelle-list-bounces at chevelles.net]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
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