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Old 12-11-2003, 10:25 AM
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opinions on best carb for my set up

thanks guys, here's the specs

350/TH350 .60 bore, hypereutectic pistons, aprox 10-1 comp, accel HEI, victor jr intake, 2.02 1.60 #186 64 CC double hump heads bowl ported ss valves, crower 1.6 roller rockers, crower 306 D 550 L cam, 3000 stall, dana 60 3.55, headman headers, dual flows

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Old 12-11-2003, 10:47 AM
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holley 650 dp for street for comp run a 750 dp just be sure to rejet the carb and check power valves
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Old 12-11-2003, 11:03 AM
Technical Support Barry Grant
 
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What are the specs on the cam you're using ? A Victor Jr. would seem a little big for your compression.
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Old 12-11-2003, 11:07 AM
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306 duration and 550 lift (with the roller rockers)
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Old 12-11-2003, 11:09 AM
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Any good running carb in the 650 cfm to 750 cfm. All carbs do the same thing. Your choice
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Old 12-11-2003, 11:19 AM
Technical Support Barry Grant
 
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A 650 Mechanical Secondary Carb would probably be your best choice for overall performance.
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Old 12-21-2003, 05:43 PM
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I think like a 750 cfm carb with vacum secondaries would be your best bet. the reasoning behind the vacum secondaries is that you wont be flushing fuel down your motor that it doesnt need. vacum secondaries will also help your gas mileage also
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Old 12-21-2003, 07:19 PM
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Yes, Listen to 1975Blue! That is your best bet.

Some say that a 750 is too big for a 350. That is BS.

You will here the carb manufacturers say that the 600 cfm is sufficient. It is if you have a grocery getter. But if you bury the pedal, you need a 750. Been there, done that.

If you still decide to go with a smaller carb, I have my 600 cfm for sale.
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Old 12-21-2003, 07:22 PM
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get a double pumper if you want the best performance out of your motor you have a nice motor dont get a vacuum carb
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Old 12-21-2003, 07:28 PM
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A 750 spreadbore vacum secondarys would work fine,but I would go with a 650 vacum secondarys for mainly street driving and a 650 double pumper for strip.
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Old 12-21-2003, 08:10 PM
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I guess I'm the odd duck here but for the money, i'd go the Quadrajet. Its rated at 750 and with some mild mods, will haul!

I just finished going through a mid 80s qjet and its awesome. It was a fairly lean smog carb, but I opened up the idle tube by 4 thousands, and opened up the off-idle passage by 6 thousands, set the secondary top butterfly angle to 85 degrees and opened the mix screw holes another 25 thousands. I installed a "K" secondary rod hanger with .040 rods and the secondarys hit like a hammer. No bog, NO stumble, just gets up and screams on my truck.

I have probably $60 in the entire job including buying the carb.
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Old 12-21-2003, 08:20 PM
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I would have to agree with Tech @ BG. You do understand that is Barry Grant right. I have a feeling he does this for a living, and probably has a pretty good idea.

From experience, I can say that a well tuned 750 DP Holley is hard to beat on the street. If you go with mechanical secondaries, I think the 650 is the best choice. Many will argue that you need more carb, but I believe most people over carb engines.

Chris
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Old 12-22-2003, 05:38 AM
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i have had alot of sucess out of demon carbs ..a little pricy but the power is there
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Old 12-22-2003, 06:59 AM
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With the higher stall speed, low compression, and larger intake a smaller mechanical secondary carburetor would generally give better throttle response, and drivability.
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Old 12-22-2003, 10:49 AM
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Edited.

Last edited by 4 Jaw Chuck; 12-26-2003 at 11:37 AM.
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