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Mod | | | Forums66 Topics128,031 Posts1,055,435 Members48,422 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Dec 2014 Posts: 357 'Bolter | | 'Bolter Joined: Dec 2014 Posts: 357 | OK. I'll let the Weber 32/38 go. And I've got three Carter W-1 on the way. Now how many do I need.
Chevy '52 3600 with a 250 in it now but looking for a 261.
I want Power, Economy.
Last edited by SavannahDog; 01/29/2019 4:49 PM.
Julian Carter
1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
| | | | | Joined: Dec 2008 Posts: 1,922 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,922 | Now how many do I need
On what manifold? | | | | | Joined: Nov 2002 Posts: 2,763 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,763 | For a 250, I don't know, because I don't know the port configuration in the cylinder head.
For a Chevrolet 261 using downdraft carburetors:
Maximum power plus best economy is going to be acquired by using 3 SMALL CARBURETORS on a three carb plenum type intake with equalizing tubes.
For the 261, with some internal modifications, three Carter W-1 tag number 420s is going to difficult to beat.
The carbs should be run with solid linkage (3 chokes, 3 idle circuits).
For a highly modified 261 for racing only???, you can make three Carter W-1 tag numbers 483s, 574s (these 2 may be mixed or matched) or 684s (no mix). I would NOT suggest these numbers for street.
Be aware that the stock metering rods may need replacing You will not know until you hook up a wide-band to the engine.
Be aware you MAY have clearance issues.
You might also consider the Corvette 3 carb set-up which was factory engineered for the 235.
Be aware you may have clearance issues with this set-up as well.
For MODEST gains in both HP and economy (DEPENDING ON YOUR TUNING SKILL) 2 of the 483s or 574s will be easier than 3, again with a 2 carb plenum style manifold and equalization tubes. Again, the metering rods may need to be replaced.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Dec 2014 Posts: 357 'Bolter | | 'Bolter Joined: Dec 2014 Posts: 357 | OK, The Equalization tubes and Metering are inside the carb.
Julian Carter
1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
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