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02-24-2008, 04:26 PM
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#1
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Join Date: Jan 2008
Posts: 19
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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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02-24-2008, 04:38 PM
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#2
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,476
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What RPM do you plan on spinning the motor?
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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02-24-2008, 04:43 PM
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#3
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Dick Hammer
Join Date: Apr 2007
Location: Hamilton,N.J.
Posts: 307
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Stick or auto ??
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1979 camaro ZZ502,TH-400 / Gear Vendors ,3.42 & 2000 camaro SS
Mercerville MotorSports, LLC
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02-24-2008, 05:17 PM
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#4
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,620
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Rochester carb.
I wouldva run one on my SS if I had enough room under the stock hood.
__________________
1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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02-24-2008, 06:27 PM
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#5
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Join Date: Jan 2008
Posts: 19
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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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02-24-2008, 06:30 PM
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#6
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Join Date: Jan 2007
Posts: 5,623
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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
__________________
2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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02-24-2008, 07:49 PM
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#7
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,476
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I would go with a Holley 750 DP or a Demon 750. The Holley Street Avengers are vac. secondary
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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02-24-2008, 08:55 PM
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#8
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Join Date: Nov 2007
Location: Jackson, NJ
Posts: 1,749
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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
__________________
1983 camaro- Scrap
1988 camaro- Also scrap
'05 Silverado- You guessed it, scrap
1988 TRX 250R- Ported w/ high compression on 110 octane- Out 60' your LT1
Jersey Shore Street Car Takeover (JSSCT) Founder
Quote:
Originally Posted by LS1ow
and once i get PHB, what do i ajust it too?
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Quote:
Originally Posted by Jersey Mike
Seven.
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02-24-2008, 09:03 PM
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#9
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by 9C1
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.
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I think a 650cfm mech secondary carb would be great for your application. A 750 might be too much.
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02-24-2008, 09:59 PM
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#10
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I will beat you with a toaster!
Join Date: Sep 2004
Posts: 6,054
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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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02-25-2008, 04:56 PM
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#11
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.
Join Date: Feb 2006
Posts: 1,385
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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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02-26-2008, 11:06 PM
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#12
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Join Date: Jan 2008
Posts: 19
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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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