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Old October 30th, 2009, 10:25 PM   #1
troypg15
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Default Boosting a 5.7 vortec questions.

Well i have been around the import scene for awhile, so i know about forced induction, but i recently picked up a 98 gmc sierra 2wd. Its got the 5.7 vortec in it, which isnt a bad motor to build upon from what i have read about them.
My question is, how would i go about boosting this thing. I really dont want to supercharge it, just because im more of a turbo kind of guy. But in your guys's opinions, or experience..how would i go about this? What turbo should i run with? Does anyone make turbo manifolds for these? (havent found any) Will stock injectors and fuel pump be able to keep up? What are the drivetrains in these able to hold up to horsepower/torque wise? Ive found turbo kits for the 5.3 and every other chevy engine, just not the 5.7.. Im looking to get about 400-450 whp out of it, would that be attainable with stock internals, and cams?
Please give me your thoughts, and opinions. And i have searched the internet for all of this information, but i havent found jack, so ive turned to you guys. Thanks in advance.
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Old October 31st, 2009, 09:05 AM   #2
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first and foremost do you plan on drag racing or just having a street toy? your gonna need alot of work to get 500+ Hp at the crank out of a stock Vortec 350. the stock fuel system and computer system will not support those kinds of upgrades. your best bet is to ditch the fuel injection setup for either a carburetor which would make tuning alot easier, or spend a ton of money and get something like the edelbrock pro-flo setup. tuneable fuel injection that would probably handle the upgrades easier. you really don't need a turbo to get 500 hp out of a 350. you can get that just naturally aspirated. vortec heads flow pretty good but theres ones that are way better.

all in all it's how much you wanna spend
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Old October 31st, 2009, 02:24 PM   #3
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Quote:
Originally Posted by Kodiak450r View Post
first and foremost do you plan on drag racing or just having a street toy? your gonna need alot of work to get 500+ Hp at the crank out of a stock Vortec 350. the stock fuel system and computer system will not support those kinds of upgrades. your best bet is to ditch the fuel injection setup for either a carburetor which would make tuning alot easier, or spend a ton of money and get something like the edelbrock pro-flo setup. tuneable fuel injection that would probably handle the upgrades easier. you really don't need a turbo to get 500 hp out of a 350. you can get that just naturally aspirated. vortec heads flow pretty good but theres ones that are way better.

all in all it's how much you wanna spend
I really just want a street toy, something that will be unassuming, and sleeper-ish. I mean really 500 crank/450 wheel is just a number that came into my head, but in all reality, on a budget of maybe 2-3 grand..what do you think i can make out of it? What upgrades would you focus on first? Obviously, CAI/headers/exhaust will come into play first, but after that..if im going to make power NA what should i delve into first?
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Old October 31st, 2009, 03:20 PM   #4
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the fuel injection setup will be your biggest limitation. then will come the cam and head combo. you need to make the engine breathe in and out more efficiently to make power. Vortec heads are really a good design from the factory but they don't flow as much air as they could for decent power. having them ported and cut the valve spring pocket for a bigger lift cam will help in that department. then buy a bigger roller cam. i'd stick with between a 268 and 280 advertised duration camshaft for good street manners. you can also install roller rockers in place of the stock ones to aid in cutting friction. once you get the engine to breathe better internally then you can install a better fuel injection system such as edelbrock, or holley made setups. a nice free flowing headers and exhaust system will finish the job.
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Old October 31st, 2009, 11:22 PM   #5
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try fullsizechevy.com too

but my opinion is a programer similer to efi live or a jet dst , cai, cam, header's and exhaust with ~ a 390 rear gear and a locker and you'll have a good manered street cruiser ready to beat all the fast honda's in lansing
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Old November 3rd, 2009, 06:13 PM   #6
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There really arent any fast hondas..and just with a stock motor i could probably yank any honda that isnt boosted around here.
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Old November 3rd, 2009, 06:20 PM   #7
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and mine has 373's and a locker stock i believe...its a 2wd sierra sle.
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Old November 4th, 2009, 06:17 PM   #8
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IMHO, (since I am researching truck engines also), you should put a 400 SBC crank (turned to fit the 350 journals) and turn it into a 383 stroker. You want Torque to get you moving and if you set up a 383 correctly, you can have 400 lbft as low as 1500 rpm.

Torque wins races, hp sells cars.
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Old November 9th, 2009, 12:12 PM   #9
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When I replaced the engine in my 96 Tahoe we put in bigger cam,headers,stall converter,cold air intake etc..The truck ran much better,but you could tell it had much more potential.Sent the pcm to pcmforless.com and it the way it ran was night and day difference.
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