600 cfm holley double pumper good idea or not - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-20-2011, 11:28 PM
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600 cfm holley double pumper good idea or not

well im gonna go new so then theres a warranty but please i need your in put before making a mistake on the purchase should i go for a 600 holley double pumper or just get the basic holley 600 thank you for your replies in advance if you wanna check out the car im putting it on its in my pics finally got some pics of the ol girl up
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Old 12-20-2011, 11:31 PM
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What size engine?
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Old 12-20-2011, 11:46 PM
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Quote:
Originally Posted by 1996thunderchicken
well im gonna go new so then theres a warranty but please i need your in put before making a mistake on the purchase should i go for a 600 holley double pumper or just get the basic holley 600 thank you for your replies in advance if you wanna check out the car im putting it on its in my pics finally got some pics of the ol girl up
Here's what Holley says in their FAQ:

Quote:
QUESTION How do I know if a vacuum or mechanical secondary carburetor is best for me?
ANSWER For streetcars the vacuum secondary carburetor works best on mid-weight or heavyweight cars with an automatic transmission. They are more forgiving than a double pumper is because they work by sensing engine load. The mechanical secondary carburetor is best on a lighter car with radical camshaft and a lower gear and manual transmission or on a car that is going to be used for racing purposes.
A vacuum secondary carb is most always the better choice for a DD that needs to get decent mileage.
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Old 12-21-2011, 12:00 AM
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ok so a 600 cfm vac secondary would work good on my 350 what about the one that have non adjustable floats or go for the 650 vac cause every time i put the specs of my car in at the site it says that it does not support my vehichle
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Old 12-21-2011, 12:05 AM
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Quote:
Originally Posted by 1996thunderchicken
ok so a 600 cfm vac secondary would work good on my 350 what about the one that have non adjustable floats or go for the 650 vac cause every time i put the specs of my car in at the site it says that it does not support my vehichle
Personally, I have no problem w/the Holley non adjustable float carbs. One less thing to leak, IMHO. Once the floats are set, they won't change unless the carb is dropped or the floats have a hole in them or something.

I don't know why your vehicle isn't covered, but you can call their tech line and talk to someone and get their input.

Good luck.
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Old 12-21-2011, 12:08 AM
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i checked at the holley site and found out it would it was the summit racing site that said it wouldnt so i think i will go with that lol
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Old 12-21-2011, 09:54 AM
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I wouldn`t waste time or money on a holley product. Why? Poor quality control. Too many times it shows up new and I gotta fix it to make it work right out of the box. Best street carb for a mild 350? Put a Quadrajet on it.
Better mileage, better throttle response and it doesn`t require a lot of work to change things as GM vehicles came with them from the factory.
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Old 12-21-2011, 10:25 AM
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FWIW an Edelbrock is a hard carb to beat for a daily driver, its cheaper too...
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Old 12-21-2011, 10:28 AM
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what carb/intake do you have now?
what other performance mods if any, have been done?
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Old 12-21-2011, 11:46 AM
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ok what i have on my engine is a edelbrock performer intake with an edelbrock performer carburetor its the jasper 249 hp 4 bolt main 350 engine with 10000 miles on it backed by a th350 tranny so thats what i got best description i can give right now how i found out what engine it was was i had to go to the jasper website but any way i know that it sounds like a whimp but i like it
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Old 12-21-2011, 11:47 AM
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i forgot to mention it also has headers and true duals on it
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Old 12-21-2011, 11:51 AM
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Quote:
Originally Posted by 1996thunderchicken
i forgot to mention it also has headers and true duals on it
If the Edelbrock is a 600/650 you already have an adequate carb. Even a 500cfm Eddy wouldn't necessarily be a deal killer for a mild DD. A 750 wouldn't make much sense, you could sell it or trade for a 600.
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Old 12-21-2011, 12:20 PM
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i been having to many problems with eddy and rochester i keep leaking at the shafts not fuel but vacuum and in stead of getting another used carb im getting new i know no 750s especially for what i have it would be overkill and over fueling i was just wandering about the holley i know many people have problems with the holley's but i've seen just as many problems with edelbrock that where new like holes in the floats and other stuff now don't think im hating on them but im looking for the cheapest carb and good performance and reliability and least adjustments thats y i was looking at the 600 cfm holley with non adjustable floats i have heard many good ratings on them
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Old 12-21-2011, 01:01 PM
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Quote:
Originally Posted by 1996thunderchicken
i been having to many problems with eddy and rochester i keep leaking at the shafts not fuel but vacuum and in stead of getting another used carb im getting new i know no 750s especially for what i have it would be overkill and over fueling i was just wandering about the holley i know many people have problems with the holley's but i've seen just as many problems with edelbrock that where new like holes in the floats and other stuff now don't think im hating on them but im looking for the cheapest carb and good performance and reliability and least adjustments thats y i was looking at the 600 cfm holley with non adjustable floats i have heard many good ratings on them
Summit sells a remake of the Holley 4010 (which is a remake of the Autolite 4100, IIRC) that is an improvement over either of the earlier versions- it even has annular boosters and comes w/a DVD on tuning. It's about the cheapest new carb out there right now (Summit sdells a reman 600 Holley 1850 for about the same price).

More- http://www.summitracing.com/parts/SUM-M08600VS/
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Old 12-21-2011, 01:15 PM
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ok thank you for your help im hoping that soon i can give a better up date thank you
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