He worked magic on my 3300/3301 BC/BD carbs. Wonderful experience.
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Show posts MenuQuote from: gt350hr on October 30, 2020, 11:24:57 AM
Let me add to this a bit.
"ALL" engines will ONLY flow a specific amount of air through a carburetor REGARDLESS of CFM capability of the carburetor. Now it would be stupid to take my statement and put a ONE barrel , 6 cylinder carb on a 427 or vice versa. Those who subscribe to the 289=600cfm rule as an absolute are WRONG. Last time I checked there are about 60 DIFFERENT 600cfm Holleys and only about 5 or 6 that really work well on a 289. WHY? Because they are "generic" in design. In late '64 , Holley engineers spent allot of time calibrating an existing Holley four barrel to work on a 289 High performance engine with a "high rise" intake and tubular steel headers. The result is the 3259 , "GT350" carburetor. It was revised ( better front metering block) and given the 3259-1 list number and the S2MS9510-A ID number added . The adjustments made allowed this former 427 FE carburetor to work on the smaller 289. While the maximum air flow potential is 715CFM , (again) the 289 will only flow a lesser number as produced. The extra air capacity does NOT "flood" the engine!!!!!!! THAT is a physical impossibility! Pure and simple. Carburetors are not designed to POUR fuel into an engine , they are designed to add fuel to air SUCKED in by the engine underneath it. The vacuum "signal" that the "boosters" "see" , pulls fuel out of the float bowls. YES a smaller CFM carburetor "can" be easier to calibrate because the smaller venturi helps the "pull" on the fuel. The amount of air flowing through the carburetor is UNCHANGED from the 715. Now change the camshaft , port the heads etc . and the AIRFLOW the engine creates will change and a larger carburetor "might" be needed. Random picking of a carburetor by size alone "may" not provide perfect calibration and require adjustments ( much like Holley engineers did on the 3259). There are at least 30 different 750 cfm carbs and "most" of them would require adjustments to fine tune them to a specific engine.
This is what keeps carburetor specialists like Drew busy. Drew has the experience needed to match a carburetor to an application OR tell us it won't work. Most of us can change jets , power valves , gaskets .FEW of us can "optimally" tune a carburetor with air bleeds, power valve restrictions etc. like an expert does.
Randy
Quote from: Bob Gaines on October 10, 2020, 08:31:00 PM
I can't tell but are the cutouts the remote electric valve activated variety or manual ?
Quote from: shelbyluva on June 10, 2020, 08:15:22 PM
The same blue Comet sold at Bonhams this year for $80,614 all in so don't feel like you missed out too much on a flip at 135k!
Quote from: shelbyluva on June 10, 2020, 08:15:22 PM
The same blue Comet sold at Bonhams this year for $80,614 all in so don't feel like you missed out too much on a flip at 135k!