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Old 04-05-2009, 02:21 PM   #1
piecesparts
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What HP is really in the 91 Silverado 350/5.7 engine.

Does anyone really know what the early 90s 5.7 engines, with TBI systems had for horsepower ratings? I had the impression that these engines were low compression, low HP rated and this supports their longivity. The numbers that I have heard are around 160 HP from the new car lot. Yet, there are individuals that have psted the numbers as high as 210 hp from the dealers.

Does anyone know the real numbers.

I am looking to replace the 275,000 mile engine in my truck and I am looking at a setup from Pace Performance. This new setup has around 265 HP complete from the crate. This will have the Edelbrock multi-point fuel injection, to assist in the improvement

Last edited by piecesparts; 04-05-2009 at 02:21 PM.
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Old 04-05-2009, 02:55 PM   #2
combustion
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Re: What HP is really in the 91 Silverado 350/5.7 engine.

Quote:
Originally Posted by piecesparts View Post
Does anyone really know what the early 90s 5.7 engines, with TBI systems had for horsepower ratings? I had the impression that these engines were low compression, low HP rated and this supports their longivity. The numbers that I have heard are around 160 HP from the new car lot. Yet, there are individuals that have psted the numbers as high as 210 hp from the dealers.

Does anyone know the real numbers.

I am looking to replace the 275,000 mile engine in my truck and I am looking at a setup from Pace Performance. This new setup has around 265 HP complete from the crate. This will have the Edelbrock multi-point fuel injection, to assist in the improvement
when i was at tech school, a base 88 1500 short bed made 143 wheel. i remember this kid thought he was hot stuff with his beefy sounding rig. but it was a turd indeed lol. im assuming 160? it has the same pos tbi injection
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If it`s 3.73 ratio you will spint the wheel 100 times to the driveshaft`s 373 times.Or,if you`re lazy,you could just spin the wheel once and the driveshaft will spin 3.73 times.Or, 3 and 3/4 turns.And if you`re real lazy,I can sell you a tab for whatever ratio you want.
Or,you could read all the suggestions and try those.It`s been well explained,I think,already.
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Old 04-05-2009, 04:33 PM   #3
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Re: What HP is really in the 91 Silverado 350/5.7 engine.

The 4.3 V6 was rated at 160, the 5.0 was 175. I think the 350 was rated around 190-200 depending on what model you got.
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Old 04-05-2009, 04:44 PM   #4
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Re: What HP is really in the 91 Silverado 350/5.7 engine.

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pos tbi injection
Why you be hatin on tbi?
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Old 04-06-2009, 02:59 AM   #5
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Re: What HP is really in the 91 Silverado 350/5.7 engine.

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Why you be hatin on tbi?
i didint mean to insult anyone, but to me its a glorified carburetor. i walwyas have problems with those systems. im wondering if it is just my luck assume? i prefer multi point better. much more tunability.
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If it`s 3.73 ratio you will spint the wheel 100 times to the driveshaft`s 373 times.Or,if you`re lazy,you could just spin the wheel once and the driveshaft will spin 3.73 times.Or, 3 and 3/4 turns.And if you`re real lazy,I can sell you a tab for whatever ratio you want.
Or,you could read all the suggestions and try those.It`s been well explained,I think,already.
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Old 04-06-2009, 08:40 AM   #6
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Re: What HP is really in the 91 Silverado 350/5.7 engine.

As I said guys, my truck yhas 275,000 miles and the truck is still strong. I want to update the engine and even look at something that has some more performance.

Combustion is right to some degree about the TBI, however it is a solid system. There are better and more efficient systems in the world.

The Throttle body was a poorly designed idea, of having two injectors spraying onto the butterflies of the unit. That in itself creates a poor fuel dispersion system. The install of a TB Spacer allows for that dispersion to increase, since it has a way to mixing up the fuel and air again. The multipoint injection gets the same amount of fuel to each and every cylinder that a carb or a center mounted TBI unnit soes not, so effectively MORE horsepower is available. The end cylinders are not starved like a center mounted unit does.
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Old 04-06-2009, 09:29 AM   #7
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Re: What HP is really in the 91 Silverado 350/5.7 engine.

Throttle body spacer (AIRRAID, for example) is legitimate. Don't even think about using a Tornado device. It's all hype, to me. It sounds logical, but it didn't work when I tried it out. Good thing it had a 30-day money-back warranty. I was driving enough to do a good test of it, too.
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Old 04-06-2009, 03:07 PM   #8
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Re: What HP is really in the 91 Silverado 350/5.7 engine.

Everything I had read had the -89-91 Burb's with either 190 or 210. I didn't pay attention but I "assume" it had to to with light duty vs. heavy duty.
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Old 04-06-2009, 07:33 PM   #9
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Re: What HP is really in the 91 Silverado 350/5.7 engine.

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Originally Posted by combustion View Post
i didint mean to insult anyone, but to me its a glorified carburetor. i walwyas have problems with those systems. im wondering if it is just my luck assume? i prefer multi point better. much more tunability.
Hey you didn't insult me, I just like the tbi system for a daily driver because of the simplicity of the system. I know tbi has its problems but it is simple to work on and the parts are cheap thats all I am sayin.
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Old 04-11-2009, 12:38 PM   #10
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Re: What HP is really in the 91 Silverado 350/5.7 engine.

The Heavy Duty 3/4 and 1 tons had 190 Horsepower 350's and the 1/2 ton and light 3/4 ton's (7200 GVW) had 200. These were the figures for '95 TBI engines.

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