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Old 11-02-2007, 09:13 PM
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I bought a 96 LT1 and Im putting it in a 91 4Runner, and Im carbureting it, but with that coil pack distributer on the front, Its ran off of a vacuum andvance system, I need to know a good site to find the computer that goes with a carb system, Ive already found the Edelbrock intake and vacuum advance computer but its like $900.00, and I really dont want to pay for just the name

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Old 11-03-2007, 05:30 AM
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The optispark on the LT1 needs the computer. If you're putting a carb on it, just use an HEI or other distributor. Trust me... the Optispark is nothing special. You don't need to spend huge dollars to keep it.

The optispark is not run off vacuum advance, its completely computer controlled.
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Old 11-03-2007, 05:44 AM
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Correct me if im wrong but other than compensating a predetermined amount on the advance if some thing should go ary. the main thing gm was doing is using a knock sensor to retard the ignition in the event of a pinging situation to not only save the engine but to reduce the combustion chamber temperature, thus reducing the preignition situation but also the nitrogens of oxide (NOX) levels that are produced when the combustion chambers reach over 2400 degrees.
I have never had a problem converting a gm smallblock to a standard HEI distributor
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Old 11-03-2007, 08:51 AM
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Why get an LT1 to run a carb and keep the computer controlled ignition/distributor?

Quote:
Originally Posted by curtis73
If you're putting a carb on it, just use an HEI or other distributor. Trust me... the Optispark is nothing special. You don't need to spend huge dollars to keep it.
Good advice. Since you already bought the LT1, I would recommend getting the Edelbrock intake and a stand alone HEI (coil in cap) distributor. The intake is $270 at Summit.

http://store.summitracing.com/partde...2&autoview=sku



Quote:
Performance without the computer.
Dual plane GM Performance Parts' Carbureted LT1 intake manifolds make it possible to take advantage of the advancements found in Generation 2 Chevy engines. They allow you to install a carburetor on your LT1 engine without the hassle of running a computer or emission controls. They accept both Holley and Quadrajet carburetors, and feature longer runners that increase engine torque by up to 30 ft.-lbs. without sacrificing top-end power.
If clearance presents problems with running a traditional rear mounted HEI distributor in your 91' 4-Runner, then you will have to modify the firewall or use the computer kit you mentioned to run the Opti-Spark when using a carb.

Best of Luck, Ed

www.edgesz28.com
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Old 11-03-2007, 06:52 PM
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Quote:
Originally Posted by LT1 Yota
I bought a 96 LT1 and Im putting it in a 91 4Runner, and Im carbureting it, but with that coil pack distributer on the front, Its ran off of a vacuum andvance system, I need to know a good site to find the computer that goes with a carb system, Ive already found the Edelbrock intake and vacuum advance computer but its like $900.00, and I really dont want to pay for just the name
GM sells a carb intake for the LT1 and 4. The ignition on the front of the engine gets trashed and a plug put in the drive hold, (comes in the kit).

The LT oil pump drive gets removed and a conventional distributor is used. No computer is necessary.

Go to Scoggin Dickey's web site for details.

Bogie
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