No LS engine for my impala yet and deeply concerned - Chevy Impala Forums
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post #1 of (permalink) Old 06-23-2012, 01:19 PM Thread Starter
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No LS engine for my impala yet and deeply concerned

Instead of going fuel injection like I wanted I'm going to have to run with a rebuilt above stock 350 v8 and a 700r4 with a carb. My luck so far with carbs has been 10 mpg across the board whether it be a whale like a 1978 Lincoln with a 460 v8/ 1964 Cadillac with a 429 or even a 1963 impala coupe that weighed 1500 pounds less with a 305. Seems like whenever I have a carb I get 10mpg even if physics says otherwise. Am I destined to get 10 mpg even with a rebuilt engine/transmission? If really like gas to be less so I can one day afford an LS/5.3 to swap into my 64. I don't get why I get the same fuel economy as a 454 suburban/dump truck/semi. Heck I even have better aerodynamics than them.
And no, I drive like a grandma. I only go 50 mph on the freeway and I press so lightly on the pedal I could put an egg behind it and it would stay safe.

By the way none of these had overdrive so I'm praying the 700r4 will help.

Last edited by MrBR; 06-23-2012 at 01:28 PM.
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post #2 of (permalink) Old 06-23-2012, 01:41 PM
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My 77 Impala with the 305, TH200, and 2 barrel carb gets about 16 highway and I drive faster than you do. The trans is a 3 speed just like yours have been. My perception would be bad carb's. I have seen some that got better than mine on mpg. And I had a couple of rebuilt carb's that were so bad that I could have sworn that I had a 454 with 4 barrel running in second gear. The first two rebuilt carb's layed down black carbon behind my Impala during initial testing. The car ran horribly so bad in fact that once I installed the third carb from a different auto parts store it took 9 miles for the engine to blow out the carbon that had built up in just 20 miles of driving with the two bad carb's on it.

The overdrive tranny will help as long as the engine can make good torque at low rpm.


1977 Chevrolet Impala Sedan, 305, TH200, 2.56:1, 110K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 350, HM290, 3.08:1, 338K miles, 15 Lifetime Warranty Parts.
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post #3 of (permalink) Old 06-23-2012, 01:46 PM Thread Starter
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My 77 Impala with the 305, TH200, and 2 barrel carb gets about 16 highway and I drive faster than you do. The trans is a 3 speed just like yours have been. My perception would be bad carb's. I have seen some that got better than mine on mpg. And I had a couple of rebuilt carb's that were so bad that I could have sworn that I had a 454 with 4 barrel running in second gear. The first two rebuilt carb's layed down black carbon behind my Impala during initial testing. The car ran horribly so bad in fact that once I installed the third carb from a different auto parts store it took 9 miles for the engine to blow out the carbon that had built up in just 20 miles of driving with the two bad carb's on it.

The overdrive tranny will help as long as the engine can make good torque at low rpm.
Maybe. I also blame the edelbrocks. The only time I got good or well decent gas mileage was driving a 1969 mustang 2 barrel carb 302. That got me 15 believe it or not. Wish my impala could do that.
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post #4 of (permalink) Old 06-23-2012, 01:51 PM
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Just my opinion but Eldelbrocks are for power/racing, not economy.


1977 Chevrolet Impala Sedan, 305, TH200, 2.56:1, 110K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 350, HM290, 3.08:1, 338K miles, 15 Lifetime Warranty Parts.
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post #5 of (permalink) Old 06-23-2012, 01:56 PM Thread Starter
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Just my opinion but Eldelbrocks are for power/racing, not economy.
I know, I'm not the one who puts them on. I usually end up with cars that have them though. Funny thing is those carbs don't really do much for my performance. I know they're supposed to add only 10-20 horsepower but the trade off in MPG is HUGE
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post #6 of (permalink) Old 06-23-2012, 03:36 PM
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The quadrajet everyone loves to hate is really good for balancing power and economy. Problem is finding someone who understands them and doesn't just screw them up. I am no fan of carbs BUT I will even say I think most carb issues are from people who didn't know what they were doing either messing with them or not messing with them when the engine combo needed the carb tweaked.

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post #7 of (permalink) Old 06-23-2012, 04:48 PM
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Buy an LS9 and screw it all.

Shop for Impala Parts:
www.basilonestopshop.com
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post #8 of (permalink) Old 06-23-2012, 05:05 PM Thread Starter
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I wish I could have any LS. But like I said I have to use a carbed 350. Maybe if one of those MPFI kits are worth it is put it on the engine otherwise I'd wait until the engine dies and then buy an LS
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post #9 of (permalink) Old 06-23-2012, 05:59 PM
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you can get a used LS motor from a truck complete for about 1500.00, just gotta look around.
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post #10 of (permalink) Old 06-24-2012, 08:38 AM Thread Starter
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you can get a used LS motor from a truck complete for about 1500.00, just gotta look around.
It may be but factor in labor and all the fabrication to put it in my 1964 +wiring work+ the tranny and I couldn't have afforded. The 4k for a rebuilt 350+700r4 +install is a much better deal in the meantime. I truly wish it could be different. I'd be getting nearly double the gas mileage.
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post #11 of (permalink) Old 06-24-2012, 10:06 AM
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You are paying for installation work?

Far as complete engine prices I know someone who scored a 80k mile 2004 6.0l with wiring accessories and pcm for $900 from a yard. Only things missing were the starter and MAF. I think region plays into pricing a LOT. This engine was scored at a Viper specialty yard in norther Wisconsin.
Supposed to be the largest collection of dismantled Vipers in north America

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post #12 of (permalink) Old 06-24-2012, 10:37 AM Thread Starter
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You are paying for installation work?

Far as complete engine prices I know someone who scored a 80k mile 2004 6.0l with wiring accessories and pcm for $900 from a yard. Only things missing were the starter and MAF. I think region plays into pricing a LOT. This engine was scored at a Viper specialty yard in norther Wisconsin.
Supposed to be the largest collection of dismantled Vipers in north America
Yeah. My toolset is limited so I have never really been able to work on my car. One day though I'll go LS. One day.
Funny how they got such a good deal on a Chevy 6.0 at a viper yard lol.
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post #13 of (permalink) Old 06-24-2012, 11:25 AM
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Dude they sell complete bolt in kits to put a LS motor in your car. They sell the motor mounts and trans mount to fit it in. I'll find the link for you.
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post #14 of (permalink) Old 06-24-2012, 11:33 AM Thread Starter
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Thanks but it's too late anyway. The guy and the tranny shop are already building an engine/transmission
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post #15 of (permalink) Old 06-24-2012, 11:37 AM
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F**k....
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