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Old 02-19-2011, 09:21 AM
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Carb ideas for LS1 conversion.

Looking for a good carb idea for my 70 Chevelle, running a carb conversion LS1 engine and Muncie 4 speed. Should I use a Vacume Secondary carb, or mechanical? It is a street car. What brand? Holley, QFT, Proform, Pro Systems, etc... It is not a race car! Mainly street car, with the capability for strip. The engine specs out at 320 hp in the 1998 Camaro SS.

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Old 02-19-2011, 02:41 PM
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Keep in injected. Easy starting, reliability, gas milage, performance. Ne reason to put a carb on it.
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Old 02-19-2011, 03:02 PM
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These run great with a carb. I built a carbed 6.0 liter LS engine. I have this engine in a '91 s10 2wd. Its 550 hp at the crank. I get 20 mpg with a th350 and 3:73's buzzing at 3500 rpm's down the freeway. The thing is a blast to drive! It will blow the tires off at freeway speeds. And its only 9.4:1 compression so it runs all day on 87! A few pics...


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Old 02-19-2011, 05:42 PM
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Quote:
Originally Posted by scapegoat
These run great with a carb. I built a carbed 6.0 liter LS engine. I have this engine in a '91 s10 2wd. Its 550 hp at the crank. I get 20 mpg with a th350 and 3:73's buzzing at 3500 rpm's down the freeway. The thing is a blast to drive! It will blow the tires off at freeway speeds. And its only 9.4:1 compression so it runs all day on 87!
Awesome. That is kind of like my set up. What carb you running? Looks like a Proform
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Old 02-19-2011, 05:45 PM
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Quote:
Originally Posted by bigdog7373
Keep in injected. Easy starting, reliability, gas milage, performance. Ne reason to put a carb on it.
You read the title of the post right? Thanks for your opinion on EFI, but I have already ditched the EFI on the engine. Im looking for carb opinions for this engine in a middle weight GM A body.
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Old 02-19-2011, 05:49 PM
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Vaccum secondary would work better. Without the efi its just like every other engine except with a different ignition.
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Old 02-19-2011, 09:50 PM
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It's a proform 750 mechanical secondary. It drives very well with this carb. I drive it everywhere. It starts well at all temps believe it or not. Even with no choke or choke tower. My sbc's never did that. I'm running an msd 6010 for ignition.
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Old 02-20-2011, 07:34 AM
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I have a 5.3 in my S10 backed by a T56. It has the edelbrock rpm intake on it with a cheapy holley 600 with vac secondaries. It was the previous owner's choice, not mine, but it works quite well.

Now if I could only get it to pass smog.....

Speaking of... you don't still have that EFI setup sitting around, do ya?

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Old 02-20-2011, 10:09 AM
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I do have the efi stuff still. I am going to keep it though just in case I switch to efi. Most of that stuff can be found used online pretty cheap.
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Old 04-17-2011, 06:41 PM
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Quote:
Originally Posted by curtis73
I have a 5.3 in my S10 backed by a T56. It has the edelbrock rpm intake on it with a cheapy holley 600 with vac secondaries. It was the previous owner's choice, not mine, but it works quite well.

Now if I could only get it to pass smog.....

Speaking of... you don't still have that EFI setup sitting around, do ya?

Nope sold it. Buying a carb tonight. Just cant decide. Not going Prosystems

Lack of $$$ right now. I have about 400 bucks
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Old 04-17-2011, 06:49 PM
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just my opinion not the law of carbs......

standard trans= mechanical secondary

auto trans=vac secondary


vac secondary's are progressive so it takes a few rpm to get them open again after shifting.

autos with less gears and the hammer down through shifts tends to keep em open longer
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Old 04-17-2011, 07:08 PM
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Quote:
Originally Posted by mud bros
just my opinion not the law of carbs......

standard trans= mechanical secondary

auto trans=vac secondary


vac secondary's are progressive so it takes a few rpm to get them open again after shifting.

autos with less gears and the hammer down through shifts tends to keep em open longer
Thanks, I have a chance to buy a slightly used QFT P-750 mechanical carb for $350 shipped. This normally sells for $770. Should I pull the trigger? I am thinking about it hard
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Old 04-18-2011, 08:36 PM
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Bought the QFT P-750 yesterday. $350 shipped. Hope I made the right choice?
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