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#1
12-19-2018, 10:49 AM
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My future carb 3bbl
I know this carb is probably not ideal, but I wanted to try it out. I built this about a year ago and took it out to look it over. I plan to run it on a torquer II, 455 running a RAiv cam and ported heads. I figured I share considering most have probably not run one before.
    Sent from my iPhone using Tapatalk
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1979 Firebird Trans Am 301/4spd (Now 428) 1977 Firebird Formula 400/Auto 2007 Grand Prix GXP 5.3L |
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#2
12-19-2018, 11:12 AM
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That is the 1050 version,I have a 950 and have run it a lot.It is always worth about 25 HP over a 780 vac sec on many dyno runs with diff engines.Make sure your intake is notched to clear the secondary blade.I have never tred the 1050,maybe Tom V will chime in.Tom
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#3
12-19-2018, 11:26 AM
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I have a 950 3BBL in my stash too. When I was trying to decide which to build, I figured go big or go home. LOL. Like I said, I did this more to be different vs being economical. Actually I figured the venturi effect is probably not much different between the 2 considering how large the opening is. The 1050 also reminds me of the Q-jet tubes in the secondaries. The divder in the Q-jet probably helps control the air and fuel flow though better then this one.
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1979 Firebird Trans Am 301/4spd (Now 428) 1977 Firebird Formula 400/Auto 2007 Grand Prix GXP 5.3L |
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#4
12-19-2018, 05:32 PM
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Friend had a 36 Chevy coupe, with a 327, running one of those. He loved it!
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 be a simple...kinda man.
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#5
12-19-2018, 09:22 PM
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Ran one for 10 years, ran beautifully. Developed a serious flat spot that I couldn't quite nail down (changed jets, pump cam, etc). Happened at cruise speeds when applying about 1/5 throttle. Check ball was seating fine, got plenty of squirt, but the flat spot was overwhelming. Ended up switching to another carb temporarily, just never got back to the 3-bbl.
Mine's dated Jan. 1969. Also shown is a photo with the choke flap closed. Maybe Tom V. can chime in! Mike
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1959-1980 Pontiac Window Sticker Reproductions : http://www.pontiacwindowstickers.com My Bio: I am currently writing articles for POCI's Smoke Signals magazine and enjoy promoting and discussing the history of the Pontiac Motor Division. Last edited by MikeNoun; 12-19-2018 at 09:27 PM. |
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#6
12-20-2018, 08:45 PM
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I ran one for a guy years ago (may have been for a friend of Tom V.) and I would suggest using wideband to tune.
Especially the sec side as they run lean.
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Carburetor building & modification services Servicing the Pontiac community over 20 years |
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#7
12-21-2018, 09:17 PM
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We need to see a video of this carb eating a white castle hamburger once you get in on the engine. Had a friend would would feed white castle hamburgers to his 3bbl equipped BBC. Would draw quite a crowd. This was back in the 80s.
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#8
12-21-2018, 10:02 PM
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Quote:
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1979 Firebird Trans Am 301/4spd (Now 428) 1977 Firebird Formula 400/Auto 2007 Grand Prix GXP 5.3L |
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#9
12-21-2018, 10:07 PM
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Quote:
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1979 Firebird Trans Am 301/4spd (Now 428) 1977 Firebird Formula 400/Auto 2007 Grand Prix GXP 5.3L |
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