Why a Holley 1000 cfm with vacuum secondaries? - Team Camaro Tech
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post #1 of 7 (permalink) Old Feb 27th, 10, 08:28 PM Thread Starter
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Why a Holley 1000 cfm with vacuum secondaries?

I am in the process of acquiring a Holley 1000 cfm annular and one down leg vacuum secondary carb. I can't figure out why in the heck Holley would build such a big carb with vacuum sec's. Makes about as much sense as the 750 dominator! lol

Does anyone know if there is a class out there with unlimited cfm but you have to run a vac sec? If not, any good guesses on what would run this type of carb? I guess a huge street motor. What's your thoughts? Thanks!


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post #2 of 7 (permalink) Old Feb 28th, 10, 03:03 AM
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Re: Why a Holley 1000 cfm with vacuum secondaries????????????

For a boat maybe?
I think boats usually have vac secondaries. Not a very common use, but possible?
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post #3 of 7 (permalink) Old Feb 28th, 10, 05:26 AM
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Re: Why a Holley 1000 cfm with vacuum secondaries????????????

The same reason for having a 750 CFm w/vac secondaries - smooth transition.
If mech sec, open the sec's, and if a gallon of fuel isn't squirted at the samer time, the engine bogs.

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post #4 of 7 (permalink) Old Feb 28th, 10, 08:43 AM
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Re: Why a Holley 1000 cfm with vacuum secondaries????????????

Is it a holley hp series?

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post #5 of 7 (permalink) Old Feb 28th, 10, 12:32 PM
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Re: Why a Holley 1000 cfm with vacuum secondaries????????????

While vacuum secondary carbs lack the "sex appeal" of the double pumpers ( no double entendre intended), they can perform far better than many people are willing to give them credit for.

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post #6 of 7 (permalink) Old Mar 3rd, 10, 10:53 AM
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Re: Why a Holley 1000 cfm with vacuum secondaries????????????

Quote:
Originally Posted by Vintage Musclecar View Post
While vacuum secondary carbs lack the "sex appeal" of the double pumpers ( no double entendre intended), they can perform far better than many people are willing to give them credit for.
Yup - L-88's had vacuum secondaries too.

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post #7 of 7 (permalink) Old Mar 3rd, 10, 12:17 PM
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Re: Why a Holley 1000 cfm with vacuum secondaries????????????

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Originally Posted by JohnZ View Post
Yup - L-88's had vacuum secondaries too.


`67 L88: LIST 3418, 855 cfm vacuum secondary

`68 L88: LIST 4054, 855 cfm vacuum secondary

The `69 L88 & ZL-1's used a mechanical secondary 855 cfm carb, LIST 4296.

I run a `67 L88 (LIST 3418) carb on my 496. Works juuuuust fine.

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