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2 barrel to 4 barrel conversion


This is a discussion on 2 barrel to 4 barrel conversion within the 1st Gen DIY forums, part of the 1st Gen : 1981 - 1993 category!
Hi there all. I have been debating on converting my 2 barrel carb to a 4 barrel and would like ...


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Old 09-13-2016, 11:57 PM   #1 (permalink)
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Default 2 barrel to 4 barrel conversion
Hi there all.
I have been debating on converting my 2 barrel carb to a 4 barrel and would like to know what else I would have to convert on my 1990 360.
Thanks for any input


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Old 09-14-2016, 03:47 AM   #2 (permalink)
 
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90's were fuel injected from the factory. That "2 barrel carb" is the throttle body injection. Unless someone removed all of the electronics and added a carb, why someone would do that only to install a 2 barrel is baffling.
If your looking for more horsepower, you need a tuner.
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Old 09-14-2016, 10:21 PM   #3 (permalink)
 
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if everything is working fine you are best to leave it as is and be happy with it. sticking a 4 barrel would likely not gain you anything other than it costing you money. the TBI system that is on the truck would likely create the exact same amount of power as a 4 barrel.

@crash there is no tuners available for these trucks. there is performance computers available for od1 trucks with magnum engines like my 93 but they are still very limited and not really tuneable.
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81 dodge d150 custom long box 318 670CFM Holley Street Avenger Carb
89 RamCharger 4x4 318/727/3.21 on 33's
93 ramcharger 318 FI 2wd
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Old 09-14-2016, 10:24 PM   #4 (permalink)
 
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Question: Isn't a 90 an LA engine? My 91 Dakota has a LA 318.


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Old 09-15-2016, 06:50 AM   #5 (permalink)
 
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yes a 90 would be an LA engine. they used them all the way up till 91 for the 239/318 and 92 for the 360


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Old 12-08-2016, 01:31 PM   #6 (permalink)
 
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IF you have a 2bbl carb, and are not thinking the TBI is a carb, the way to do what you want entails a lot of work. First off to do a 2bbl to 4 bbl swap the right way you really need to go to a hotter cam. Otherwsie a 4 bbl will be no benifit at all and might be a step backwards. Second, on a 90s vintage 318 or 360 a 4 bbl will have to be a small one to work at all. If you still want to do it get a cam made for the chrysler small block that is in the middle of the street strip range and a 500cfm carter carb and a good aluminum intake, and a phenolic spacer.


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