What size cfm 4 barrel should be on 351 cleveland. Stock engine
605 cfm
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Stock carb was Autolite 4300 605 CFM
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Actually the stock 4V was rated around 400 CFM. The 430 Lincolns got 600 CFM. Autolite carbs are pretty puny.
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There was an earlier 1” venturi version of the 4300 rated at 440 cfm used from 67 to 69, but the 70 cars with 351C got a 1.25” venturi version rated at 605 cfm.
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Thanks very much fellas. That answers my question. 
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If it’s an Autolite carburetor the design is terrible and it needs to be replaced by a good Holley to make the car run right.
After years of trying to stick with my original Autolite 4300, I agree 100%! It’s not worth all the trouble.
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I ended up putting an Edelbrock 600 on it. After little tuning it purrrrs like a kitten.
Very pleased.
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Looking at the Holley 4160 for my 351C and wondering if 600 cfm is adequate, or should I go up to 750 cfm? Don’t believe I need a double pumper, right? Not looking to race, just want to hear it roar when I floor it. And smoother idle would sure be nice for a change.
There is a 650 size vacuum secondary Holley that is about right for a 351 engine. May be more expensive than the 750 vacuum which also works very well.
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