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 Post subject: 4.3L Swap: Carb Dilemna
PostPosted: Wed May 05, 2021 2:55 pm 
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Looking to do the 4.3L swap, with manifold & carb. Trying to stay away from the stock manifold/carb set-up from the Chevy Astro. So the Edelbrock 2111 seems to be the right manifold. But which carb? The Edelbrock is my first choice as I like their simplicity and reliability, but 500 CFM seems like too much. The Holley 8007 390CFM is appealing, but isn't cheap (over $600) and I find them trickier to dial in. Was wondering what other LUVers are using, and how you like them. :?: :?: :?:


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PostPosted: Wed May 05, 2021 5:44 pm 
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500 shouldn’t be too much for a 4.3.

750cfm divided by 350 cubic inches is 2.14 cfm per cubic inch. 2.14 cfm times 264 (4.3 liters) is 565 cfm.


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PostPosted: Thu May 06, 2021 8:41 am 
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I appreciate that. When I used the Summit CFM calculator, and plugged in Max RPMs of 4000, and engine size of 262, it gives an answer of 257.75. Those Holley 390CFMs are just too pricey ($619).

https://www.summitracing.com/newsandeve ... calculator


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PostPosted: Fri May 07, 2021 10:05 am 
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Ah I see. I’m pretty sure that calculator wants the max rpms the engine will handle, not what you expect to self-limit to.

In any case, lots of people have had success with the edelbrock 500 carb on a 4.3. You may have to jet it a little smaller than stock. Remember the 500 cfm refers to airflow and is only 1 part of the equation. Just because the carb is capable of pulling 500 cfm doesn’t mean it will.


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