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Old 02-24-2008, 04:26 PM   #1
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Carb Recommendations?

Engine is a moderate 355 4 bolt. Ported Vortec heads with bigger springs,retainers, valves.....ect....Comp Cams XE284H hydraulic flat tappet grind with .507/.510 lift and 240/246 duration @ .050, Edelbrock RPM Airgap intake.

Ive got a few QC's layin around that could be worked to flow a little better, but what would you recommend for a street/strip application?
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Old 02-24-2008, 04:38 PM   #2
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What RPM do you plan on spinning the motor?

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Old 02-24-2008, 04:43 PM   #3
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Stick or auto ??
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Old 02-24-2008, 05:17 PM   #4
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Rochester carb.

I wouldva run one on my SS if I had enough room under the stock hood.
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Old 02-24-2008, 06:27 PM   #5
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4 spd stick.

1800 - 6500 RPM.

The reason Im asking is Im very familiar with Rochesters, but I have no experience with aftermarket stuff. I was looking at a Demon 650cfm, thinking it would flow better at higher RPM, but whatever it is, I want it to be mechanical secondaries because its basically the only thing I am familiar with tuning.

Last edited by 9C1; 02-24-2008 at 06:32 PM.
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Old 02-24-2008, 06:30 PM   #6
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go with a Holley street avenger 670 or 750, I have a 670 on my 350 and its just a tad much
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Old 02-24-2008, 07:49 PM   #7
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I would go with a Holley 750 DP or a Demon 750. The Holley Street Avengers are vac. secondary

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Old 02-24-2008, 08:55 PM   #8
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I think a demon 750 will give too much flow, my friend runs one on his ss sprint car (he runs alcohol) and its perfect for him
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Old 02-24-2008, 09:03 PM   #9
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Quote:
Originally Posted by 9C1 View Post
4 spd stick.

1800 - 6500 RPM.

The reason Im asking is Im very familiar with Rochesters, but I have no experience with aftermarket stuff. I was looking at a Demon 650cfm, thinking it would flow better at higher RPM, but whatever it is, I want it to be mechanical secondaries because its basically the only thing I am familiar with tuning.
I think a 650cfm mech secondary carb would be great for your application. A 750 might be too much.
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Old 02-24-2008, 09:59 PM   #10
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the demon 650 I had on my 327 with similar setup worked amazing, however when I went to a 750DP of my buddies, it made quite a bit more power but seemed to sacrifice some low end torque. I think I dumped too much fuel down low, but when i was pulling from 2k+ I saw a difference. Now with a bigger cam and the 4speed I will be going with a 750. Its your choice but to be honest I think a 700 or a 750 would be my bet.
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Old 02-25-2008, 04:56 PM   #11
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too much carb can have an adverse effect on the piston ring seal and fuel delution of the oil

i put 750s on 454 BBC motors with 9-1/2 compression and a small cam it makes it a neck snaper but than again its a street car for the most part you are doing - and bigger has some advantage in seat tuning only not for the long haul my choice for a carb would be a 600 top on an 850 bottom makes it work un real hard and has the WOT flow of good MPH in the traps - jz
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Old 02-26-2008, 11:06 PM   #12
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Probably going with a Mighty Demon 650 with mechanical secondaries.

Thanks for the input guys.

Last edited by 9C1; 02-26-2008 at 11:06 PM.
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