Sheldonconnor
Forum Newbie
Posts: 3
Reg: 02-29-12
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02-29-12 10:33 PM - Post#2196976
Hi guys I'm building a 84 Toyota and I just installed a 4.3 into it. It was tbi and I got a intake from edlebrock but I need a carb. I was told any carb off a 305 or a 350 will work on a 4.3. Is this true. I have a 4 barrel on it right now with a mechanical choke but for some reason you need step on it once and awhile to make it run right it will blow black smoke out the tail pipe. I believe it's a bad carb but is it true u can use a 305 or a 350 carb on it. It will run smooth but when you punch it it's like the choke kicks in so u stomp on it again and it's fine
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SleeperSS
Senior Member
Posts: 1812
Loc: Spanaway, Wa
Reg: 10-17-04
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02-29-12 10:54 PM - Post#2196984
In response to Sheldonconnor
Sounds like the carb is a bit big for it.
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Sheldonconnor
Forum Newbie
Posts: 3
Reg: 02-29-12
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02-29-12 11:23 PM - Post#2196994
In response to SleeperSS
Will a stock 4 barrel carb off a 305 or 350 work on a 4.3
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Sheldonconnor
Forum Newbie
Posts: 3
Reg: 02-29-12
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02-29-12 11:29 PM - Post#2196997
In response to SleeperSS
Will a stock 4 barrel carb off a 305 or 350 work on a 4.3
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oldsman52
Contributor
Posts: 567
Loc: Randy's House.
Reg: 01-18-12
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03-01-12 04:59 AM - Post#2197027
In response to Sheldonconnor
iT WILL WORK, THE q-jETS ARE SUCH THAT IT WILL ONLY OPEN AS MUCH AS DEMANDED WHERE SOMW
E VACUUM SECONDARY CARBS REACH A CERTAIN VACUUM LEVEL AND OPEN THE SECONDARIES ALL AT ONCE. Sorry for the caps. 
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 gchemist
Senior Chevytalk Moderator
Posts: 20822
Loc: Austin, TX 78748
Reg: 05-09-00
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03-01-12 08:51 AM - Post#2197099
In response to oldsman52
Welcome to the site.
A 305 jetted carb will work better. In 86, C10 trucks had carbed 4.3 engines. Jet it down and use a vacuum guage to tune it.
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS |
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 rumrumm
"12th Year" Silver Supporting Member
Posts: 1783
Loc: Macomb, IL
Reg: 10-18-01
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03-01-12 03:18 PM - Post#2197220
In response to gchemist
1985 Astro vans also had a carburetor on their 4.3's.
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C10 Sleeper
Valued Contributor
Posts: 3426
Loc: Redding Ca
Reg: 03-17-09
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03-01-12 08:48 PM - Post#2197338
In response to rumrumm
The 1986 elcamino and GMC caballero did too. Either way a small Holley or properly set up q jet from any sbc would probably be OK.
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 ranman
"2nd Year" Silver Supporting Member
Posts: 10674
Loc: The cold wet and windy O...
Reg: 03-10-01
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03-02-12 02:24 AM - Post#2197394
In response to oldsman52
iT WILL WORK, THE q-jETS ARE SUCH THAT IT WILL ONLY OPEN AS MUCH AS DEMANDED WHERE SOMW
E VACUUM SECONDARY CARBS REACH A CERTAIN VACUUM LEVEL AND OPEN THE SECONDARIES ALL AT ONCE. Sorry for the caps.
Any carb will not do........... oldsman said it correctly.
........or find a small 4BBL of another brand if you are able to. You will certainly need less than a 600 if it's not QuadraJet.
~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
If plants ruled the world, would they regulate oxygen?
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busterrm
Contributor
Posts: 974
Loc: Wichita Falls, Tx
Reg: 08-31-10
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03-02-12 06:53 PM - Post#2197712
In response to ranman
What is your max rpm going to be? A 4.3 is equal to 262 CI. Put in the cfm formula (CI X max rpm/ 3456 X Vol eff = CFM needed.)
Example: your 262 ci v6
262 X 6000rpm/3456 X 90%(est) = 409.375 cfm.
I would not run anymore than 450 cfm.
Holley makes 4 barrel carbs in 390 and 450 cfm.
One of those two carbs would work.
==== BOB ====
If I can't smoke the tires I want more!
1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2005 Yamaha Vstar 1100 midnight custom |
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