Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Old May 24, 2016 | 08:14 AM
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Default Fuel Delivery

Hey guys, im new to the forum, and Ls engines in general. My question is as follows:
I have a 1975 Caprice Classic Convertible. I am swapping the original sbc 400 with an LM7 and 4l60e tranny. ECM has been rewired to run in this setup. I plan on using my existing tank, with an external lp fuel pump, to an Edelbrock sump tank with hp fuel pump. My question is, will this work?
Am i missing anything as far as parts go with this setup? Thanks in advance for any and all help.
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Old May 24, 2016 | 02:02 PM
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It will work, but seems a bit expensive with no real advantages. Why not change out the tank to an EFI tank? Can you fit the later model efi b body fuel tanks under there? They fit under the A body chevelles nicely, but I'm not familiar with the caprice.
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Old May 24, 2016 | 02:12 PM
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Im not sure how expensive it is. An external fuel pump runs about $40 and Edelbrock Sump Kit is abut $599. All the aftermarket tanks for Bbodies that i have seen, are around $600.
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Old May 24, 2016 | 03:16 PM
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Take a look into the Tanks Inc retrofit fuel module. They can be used in about any tank for $230

Another option would be the Aeromotive Phantom setups for about $450
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Old May 24, 2016 | 03:31 PM
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Rock Auto list a tank for your car, 22 gallon $138. This would be an excellent place to start. Use an existing in-tank pump or build your own setup. My research indicated that an '88 Camaro pump, altho designed for 45 lbs will work just fine at 60 lbs on a stock LSx motor. All parts stores have them in stock at about $55 so on a trip far away from home there would be a replacement just around the corner. How's that for an under $200 solution?
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Old Jan 3, 2018 | 09:44 PM
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Originally Posted by reghoskins
Hey guys, im new to the forum, and Ls engines in general. My question is as follows:
I have a 1975 Caprice Classic Convertible. I am swapping the original sbc 400 with an LM7 and 4l60e tranny. ECM has been rewired to run in this setup. I plan on using my existing tank, with an external lp fuel pump, to an Edelbrock sump tank with hp fuel pump. My question is, will this work?
Am i missing anything as far as parts go with this setup? Thanks in advance for any and all help.
Not to hijack this older thread but did you have to set the engine back 1” with your set up? Running the same on my 75 caprice
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