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Old 11-15-2010, 05:47 PM
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LS1 Carb Swap and Cam Swap.

I have been working on my 70 Chevelle project for some time now. I have posted several times with different questions on SBC, BBC, TBI, and now...I have now purchased a 98 LS1 out of a Firehawk T/A WS6 car with a T56. I only have the engine, EFI intake, throttle body, and computer. I also have part the wiring harness. Some of it is cut, and Im really not to savy on the EFI thing yet. I thought about swapping to the Edelbrock Victor Jr LS1 intake, MSD 6LS, and Holley 750 Street HP carb. I also thought about changing the cam to work better with the intake. My car has 4.10 rear gear and as of now I plan on running my M21 4 speed. A few years down the road, I may put the EFI on it and run a T56, but for now, I would like to use what I already have. I may end up putting a plate NOS system on it as well. So...any suggestions on what I need to do first? I am about a day away from ordering the carb intake. I have read a lot on people doing the swap, but I still have lots of unsolved questions. Thanks. I have some trans questions but ill post those in the right spot.

Shawn

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Old 11-15-2010, 05:54 PM
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Is this the one? http://www.jegs.com/i/Edelbrock/350/...39#moreDetails That should be pretty simple to install and it eliminates all the computer crap that the efi requires.
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Old 11-15-2010, 06:10 PM
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Quote:
Originally Posted by bigdog7373
Is this the one? http://www.jegs.com/i/Edelbrock/350/...39#moreDetails That should be pretty simple to install and it eliminates all the computer crap that the efi requires.
Yes basically. Only I plan on buying the Victor Jr LS1 intake rated from 3500 to 7000 rpm and the MSD 6LS ignition box. The one MSD makes for Edelbrock uses pills to adjust timing and the MSD 6LS lets you make changes from your laptop using a MSD program, along with a built in 2 step rev controll and a step timing retart for NOS. So far I have found the intake by itself for $259, and the MSD 6LS for $309. Carb will run around $469.
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Old 11-15-2010, 06:19 PM
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Wow, expensive carb. Not to pick on you or anything but it's NO2 not NOS. NO2 is nitrous, NOS is a company name and what ricers say. It you drive a chevellle then you're not a ricer.
If you're on a budget you may want to use a less expensive carb because the price of a cam for an ls engine if going to be substantially higher than that of a regular sbc.
btw do you have any pics of the car? 1970 chevelle is my favorite car, i just haven't found one in my price range and no one wants to trade for a 78 firebird.
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Old 11-15-2010, 06:19 PM
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Here is the link for thttp://www.jegs.com/i/Edelbrock/350/2908/10002/-1he Victor Jr kit
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Old 11-15-2010, 06:22 PM
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Any pics of the car?
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Old 11-15-2010, 06:40 PM
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Quote:
Originally Posted by bigdog7373
Any pics of the car?
Here is the car. Still waiting on fenders, bumpers, etc...from body shop.
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Old 11-15-2010, 06:46 PM
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Quote:
Originally Posted by bigdog7373
Wow, expensive carb. Not to pick on you or anything but it's NO2 not NOS. NO2 is nitrous, NOS is a company name and what ricers say. It you drive a chevellle then you're not a ricer.
If you're on a budget you may want to use a less expensive carb because the price of a cam for an ls engine if going to be substantially higher than that of a regular sbc.
btw do you have any pics of the car? 1970 chevelle is my favorite car, i just haven't found one in my price range and no one wants to trade for a 78 firebird.
Yeah, my bad on the NOS part. That is the brand of kit I used to own. NOS Super Powershot. I normaly just say nitrous. OOPS!
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Old 11-15-2010, 06:48 PM
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That car's gonna be sick when you're done with it. The ls1 will really bring up the value of the car.
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Old 11-15-2010, 07:44 PM
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Quote:
Originally Posted by bigdog7373
That car's gonna be sick when you're done with it. The ls1 will really bring up the value of the car.
So IYO, am I on the right track by going with the carb swap on this LS1? It seems this is the budget way to getting the engine in the car and running. I am really impressed with the build of the GEN III engines. They look very strong, and very light weight. I guess I will be putting my BBC stuff up for sale soon!
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Old 11-15-2010, 08:00 PM
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yup. i believe the ls1 has 6 bolt mains also.
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Old 11-19-2010, 11:21 PM
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I bought the MSD 6AL box and GMPP singale plane intake for a 5.3 that I putting into a 51 Chevy pickup. I havent done anything with it yet cause I still need to get engine mounts and figure out how I am going to run the power steering and alternater. You have to use a later style alternater for a serpintine belt but unfortunatly the holes don't line up with the stock bracket.

I have talked to Comp about a cam and they can recommend something but after you buy the roller cam, springs, hardware, and timing chain its about $1000.

Heres a link to Wegner Automotive Research. They have done alot of testing for GM with the carb intakes and also have a adapter that bolts onto the front of the engine and uses a Ford distributer in place of the MSD set up.

http://s41657.storefront-solutions.com/default.aspx
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Old 06-16-2011, 12:33 PM
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Update: Engine is completely bolted in the car, carb swap complete, went with a QFT Pro750 mechanical. Still looking for a good cam.
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Old 06-16-2011, 01:16 PM
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Quote:
Originally Posted by Hacksaw
Update: Engine is completely bolted in the car, carb swap complete, went with a QFT Pro750 mechanical. Still looking for a good cam.
You know what would work well? The factory LS6 or LS7 cams with a set of beehive springs. You can get a good used one for little or no money. But then again you didn't say what you want the car to do.

I've used Jones Cam Designs (jonescam.com) and since you have gone this far, you might as well get something special for the old girl. Mike hits it right first time, everytime.
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Old 06-16-2011, 01:29 PM
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The stock efi cams have a wide lobe center angle not really suited for carb applications. I was thinking of using a stock 99 LS1 cam in my 5.3. After looking at Texas Speed they can do any LSA.

I googles gen 3 carb cams and found a link to a magazine article where they tested a carb and efi motor using the same heads and cam. The results were simular but could have been better.
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