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
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 -----
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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