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Thread: Clifford 6 cyl Dual Quad Intake

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    VCVC Member van-itti's Avatar
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    Clifford 6 cyl Dual Quad Intake

    This is going to be interesting to see how much it sells for...
    So far 7 bids in a few hours.

    https://www.ebay.com/itm/29456873300...=&toolid=10050
    Mike

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    Strip but not street?

    That's a lot of carburation for a six cylinder engine. I wonder what kind of engine speed it would take to reach the CFM that two 4 barrel carbs could provide.
    108VanGuy...
    1969 Chevy Panel, 250 CID, 3 ring 4 Spd. with OD, 2.73 "WedgieVan" Daily Driver
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    Quote Originally Posted by 108VanGuy View Post
    That's a lot of carburation for a six cylinder engine. I wonder what kind of engine speed it would take to reach the CFM that two 4 barrel carbs could provide.
    108VanGuy...
    I was wondering the same thing.

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    Zoom Zoom

    So I was curious about this and took a moment to run some numbers with the help of the Summit CFM calculator. Running some of the smallest 4 barrel carbs readily available at about 325 CFM, times 2 carbs, the calculator comes up with these numbers. A 292 would need 7,000 rpm to hit 650 CFM and a 250 would need 8,200 rpm. I'm thinking either of these two six bangers wouldn't last too long at engine speeds like that.
    108VanGuy...
    1969 Chevy Panel, 250 CID, 3 ring 4 Spd. with OD, 2.73 "WedgieVan" Daily Driver
    1967 Chevy Panel, 230 CID, 3 Spd. 3.36 "UtiliVan Owned since 76
    1964 GMC Panel, 194 CID, 3 Spd. "CrunchoVan"
    1965 Chevy Panel 350 CID, 3 Spd. "RustoRoof" Runs but wiring bad
    1969 Chevy 108 Display 307 CID THM 350 Power Brakes 3.73 Posi
    1965 Chevy Panel, V8, 3 Spd. "Gold Hills Van"
    1965 CamperVan, V8, 3 Spd.
    1969 G20 Shell

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    VCVC Member jrinaman's Avatar
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    possibly 'rare' because it is older and doesn't have the water inlets for heat. Other than that, it's the same intake I am using now. The 4-barrel adapter bolts on, I have the 2-barrel adapters on mine. You cannot bolt on any carb without that top plate/adapter. I take CFM flow with a grain of salt, especially with multiple carbs. I use it more as a starting point but have seen engines with bigger carbs run better threw out the rpm range and also saw them kill the responsiveness, bog down or flood. 292's love more fuel. in my experience, you can overshoot a little on the carbs on our 6 cylinders. having my engine out and a bone stock 292 for the summer, I ran that intake with dual webers (38/38) and had very little issues. It would flood if I floored it from idle but never an issue above 3000 rpm. I didnt take the time to rejet as it was a temporary engine and knew it was a bit too much carb. I could see a built 292 taking 2 4-barrels but at the same time, I would refer to the CFM calculator on a random engine of similar cubic inches and work up or down from there.
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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    Wonder if any of the Swamp Buggies in the 6 cyl classes use an intake like this. They move pretty quick for just 6 cylnders.

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