Carb recomendations for my Big Block - Team Camaro Tech
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post #1 of 9 (permalink) Old Oct 8th, 16, 12:39 AM Thread Starter
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Carb recomendations for my Big Block

While installing my new transmission I realized the TV cable corrector kit wont work on my old Holly 850 DP. The throttle shafts are loose and it needs to be replaced any way. I was going to wait until this next summer but looks like now is a good time. I am looking for carb recommendations. I have had good luck with the 850 that's on there. I like the holly style carbs. It has had the choke horn cut off and I don't really need the choke anyways. I was looking at the Quick Fuel Supper street Mechanical secondary 850 and two hollys. The regular 4150 double pumper 850 and the 4150 street hp 850. My engine is 460 CI. with @9.5:1 compression, Edelbrock Performer rpm oval port heads and intake and a performer rpm cam. lift at cam is .330 intake and .337 exhaust LSA is 112. Edelbrock says 540 hp at 6500 or so. No I am not ready for fuel injection yet that will be later. If you have any experience with any of these carbs good or bad or have a better idea I would love to hear about them. Thanks I will probably order one Monday morning.

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post #2 of 9 (permalink) Old Oct 8th, 16, 08:58 AM
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Re: Carb recomendations for my Big Block

My choice would be a 1050 Dominator. But you would probably be happier with the Quick Fuel 850.

Big Blocks respond well to a Dominator carb as they breathe better. They breathe better not just because they have a higher cfm rating but because of their use of annular boosters and a bigger venturi. So if you compared a 1050 cfm 4150 to a 1050 cfm 4500 carb the Dominator not only makes more power, but has a better throttle response.

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post #3 of 9 (permalink) Old Oct 8th, 16, 10:02 AM
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Re: Carb recomendations for my Big Block

Lyle, I also have an oval port 461 big block. I contacted Eric at Vintage Muscle Car Parts. He builds and restores all types of carburetors but mainly Holley's. He recommended and built a 1000 HP Holley for my big block. I sent him all of my specs and he built and tuned the carburetor to fit my combination. He can also rebuild and modify your existing 850 if you choose. He also has excellent follow up support once you install your carburetor. I would at least give him a call to see what he says. He is also a member here on TC.

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post #4 of 9 (permalink) Old Oct 8th, 16, 11:16 AM
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Re: Carb recomendations for my Big Block

Consider Holley 8896 with a change to progressive secondaries?

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post #5 of 9 (permalink) Old Oct 8th, 16, 05:50 PM Thread Starter
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Re: Carb recomendations for my Big Block

Thanks for the info. I thought about a custom carb but want to get my car on the road asap. Work is busy and snow is comming. I have only driven this car once this summer before the th400 gave up. One ride in 16 years ain't good. For those reasons I want an off the shelf carb.
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post #6 of 9 (permalink) Old Oct 8th, 16, 07:21 PM
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Re: Carb recomendations for my Big Block

I have been playing with both the down leg 850/4781 and the annular booster 9380. The annular has much better throttle response on the street and gave me a perfect AFR at the big end. The lean cruise is fat, but I just fixed that today, the IFR is to big at .037, go down to .034. It comes from Holley with 2 jets leaner all around and responded in better mph the more I leaned it out. It will be much cheaper to use a 4150 than a dominator and intake.

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post #7 of 9 (permalink) Old Oct 9th, 16, 07:40 AM
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Re: Carb recomendations for my Big Block

You have good heads so I would recommend the Holley 1000 cfm 0-80513-1 first. Do not get rid of your 850, it can be rebuilt. The only 850 Holley is selling now is the street edition (silver) and the Ultra HP 850. I don't care for the Holley Street HP. I like the Ultra XP 850 but it is expensive. My machinist recommended the Holley 830 HP with annular boosters when I first had my 454 rebuilt. I chose a Holley 850 Race 0-9380.
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post #8 of 9 (permalink) Old Oct 10th, 16, 01:52 PM Thread Starter
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Re: Carb recomendations for my Big Block

Thanks for all the feedback. I ordered the quick fuel SS mechanical 850. It will get it going and probably be ok for a street car. If not I've got a plow truck that needs a carb too. I also realized I didn't Have any ported vacuum spots on my old holly 850 which my new 700r4 transmission needs. The new carb should have one. Eventually I might put efi on but the more I looked into that the more money I wanted to spend.
I have also had problems getting full throttle in the past. The factory mechanical set up leaves a lot to be desired. Hopefully I can get that sorted out too. Seems never ending with this car.
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post #9 of 9 (permalink) Old Oct 15th, 16, 07:32 AM
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Re: Carb recomendations for my Big Block

Looks like I arrived too late. HP950 hands done with the cam and compression your running. Had similar combo except 468 and 10.5 compression. Car ran 11:60's on street tires and didn't load up in traffic.
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