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Old 06-08-2012, 12:32 PM
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Chevy 305 running bad

I have a 84 jeep cj7 with a 305 t350 and dana 300. the motor is stock other than an aftermarket intake, and headers. the carb i have is an edelbrock 750. the only reason i have it on there is to get it done for the last day of school. i know its way to big but my question is, can it be jetted down to work? how much is a 750 hurting it? Id also like to do some work to get more power. any suggestions?

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Old 06-08-2012, 05:23 PM
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Quote:
Originally Posted by Jeepracer427
I have a 84 jeep cj7 with a 305 t350 and dana 300. the motor is stock other than an aftermarket intake, and headers. the carb i have is an edelbrock 750. the only reason i have it on there is to get it done for the last day of school. i know its way to big but my question is, can it be jetted down to work? how much is a 750 hurting it? Id also like to do some work to get more power. any suggestions?
What year is the 305? The best way to increase power is to put some good aftermarket heads on it and change the cam. There will be a lot of suggestions on these so I will stay out of that argument. The carb is too big for the stock 305 and changing the jets will not help, the venturi will still be the same. It will probably work if you upgrade the heads and cam.
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Old 06-08-2012, 05:56 PM
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Quote:
Originally Posted by Jeepracer427
I have a 84 jeep cj7 with a 305 t350 and dana 300. the motor is stock other than an aftermarket intake, and headers. the carb i have is an edelbrock 750. the only reason i have it on there is to get it done for the last day of school. i know its way to big but my question is, can it be jetted down to work? how much is a 750 hurting it? Id also like to do some work to get more power. any suggestions?
If you have an adjustable secondary air valve carb, you can run it and it will do OK. If you don't have an adjustable air valve, the carb still may work for you, but either way it is not what would be the first choice for that engine.

If you have to make do w/it, you might need to change the jetting and/or step up springs and/or metering rods, but that will depend on how it runs and what the plugs look like, and whether the engine is rich (black exhaust on acceleration) or lean (pings and has poor performance). HERE is the manual. With the info from it and from Edelbrock Performer Series Carburetor- Complete Guide to Set-Up, Tuning, and Performance Jetting, and for reference- Detailed Rebuild Instructions, you can go about adjusting it for better performance.

But like any "performance" engine, before tuning the carb for best performance you need to look into setting up the ignition timing and the timing curve. More on that here.
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