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Old 09-02-2002, 06:48 AM
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Post desperately seek opinions for carb choice

I have a 1970 with original 350 motor and I am having a hard time determining which carb to use.
2 years ago I purchased a Holley 4010 750cfm vacuum secondary carb for this car however my
engine builder feels that this carb is too big
(because of black fouled plugs) for my motor. This carb has not yet been rejetted! He suggest buying a new carb in the 600 to 650 cfm range and I can not decide what to buy - or- if I should just try rejectting the 4010 carb.

Here is my setup - would genuinly appreciate your thoughts, advice.

350 cid - 4 bolt main, 10:25 to 1 compression
bored .040 over/approx 310hp?
Performer RPM intake
mild cam /not sure of lift, etc. Comp Cams c410-P
3:73 rear end
TH350 transmission
Hooker Headers into dual 1 1/2" exhaust

I'd aprpeciate any advice offered as I am having a hard time justifying spending the $ for a new carb but would if needed. This project is severely over budget!!!!
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Old 09-02-2002, 06:57 AM
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I have gone from Holley to Edelbrock myself. Use the 650 with either vacuum or mechanical secondaries. Like you said, just my opinion
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Old 09-02-2002, 07:02 AM
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Madds right. I like the Edelbrock also. They have easy to change metering rods that you can do right on the car. Rejetting the Holley is a low budget fix. Try it and if it dont work. Sell it and buy a new carb. HG
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Old 09-02-2002, 07:02 AM
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I should probably have included the following info as well.....

The heads have been replaced with the World Products S/R Torquer heads. The car is a 1970 Nova SS that will be driven on weekends, to car shows, and maybe an occasional trip down the track.

tanks
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Old 09-02-2002, 07:03 AM
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Original carb too big. Jetting won't solve problem, just bring on more. Suggest something in 600 - 650 range. Probably be happier with Edelbrock series. If use Holly watch power valve number. Just my opinion from past experiences.
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Old 09-02-2002, 07:06 AM
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I notice Edelbrock has a 600 cfm vaccum secondary but NOT a 650cfm one. Are you folks that run these
Edelbrocks happy with them? Will it give me the performance I need to occasionally step on it fly?

Appreciate your quick responses so far! Keep them coming.

thanks again
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Old 09-02-2002, 09:02 AM
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ive run edelbrocks on two cars and they are easy to tune and the few horses you might loose from ditching the holley, you are going to more than make up in lower rpm tourque. i am betting your car will have lower et,s from a well tuned edelbrock than from a rejetted oversized holley.. go with the edelbrock!!!
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Old 09-02-2002, 09:11 AM
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Keep the Holley and learn how to tune it, Either carb will need tuning to fit your combo. It all depends on which system you want to learn to tune.
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Old 09-02-2002, 09:23 AM
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I've always run holley 750s on my small blocks with no problems. You've got to jet them for your set up. One size does not work with all engine combos, Thats why they make them replaceable instead of just drilling the thottle body which would be much cheaper. I'am not saying a smaller carb would'nt have been a better choice with the auto trans, But you already own the 750. Dial it in and it will work as good as anything out there.
Just my opinion...
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Old 09-02-2002, 09:25 AM
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Damn it...4 Jaw you beat me to it.
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Old 09-02-2002, 09:43 AM
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just my opinion, many might disagree but my personal experience has been that the holley's hate to sit around, there are so many internal passages to the things that you have to constantly keep fluid flowing through them.
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Old 09-02-2002, 09:56 AM
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HI TX I"D go for a holly 600 Sec vac,once you get a holly set up (bit of a pain in the arse) to start with ,but you get into the routine,MOSTLY on the float hight,tweak a bit dive round the block,tweak a bit more, drive round the block, you"ll get there

BY THE WAY GET RID OF THE 1 1/2" exhaust, go at least double,it"S like tryin to blow a trumpet thru a rat"S arse!!!! CHEERS PKP
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Old 09-02-2002, 10:41 AM
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The float level on a holley is a none issue. You set them one time at idle and you don't have to change it the rest of your life,unless you do a rebuild on it.

[ September 02, 2002: Message edited by: hcheetwood ]</p>
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Old 09-02-2002, 10:50 AM
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meant to say fuel level thru the "sight hole" IF god made us with no chins, and 30" wheels you could see the fuel level a bit better.
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Old 09-02-2002, 10:56 AM
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Another thing guys, new hollys ,best to blow them out with an airline! three times my mates have had jets blocked by swarf ! brand new carbs,sack the quality controller <img src="graemlins/nono.gif" border="0" alt="[nono]" />
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