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fastest way to 300 whp

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Old 06-22-2012, 05:51 PM   #1
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Default fastest way to 300 whp

i jest got my new toy a 91 350ss turck.i know some say that gm did not make a 350ss and jest a 454ss but i have the title and it has 350ss on it so lets not start all that bs lol. my plan is to use it for my dd /tow my firebird to the track so no spray or boost
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Old 06-24-2012, 08:33 AM   #2
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TBI Correct ?

If you don't need emissions stuff anymore I would do away with all that, I would run headers and dual exhaust.

May need to swap intake for say an edelbrock performer/performer rpm. May port your heads and do a cam swap.

If you fell up to it you can swap out the tbi for just a carb it makes more sense is simpler and allows more modification. (If you don't need emissions)

Edelbrock has top end kits which are great that's what I have on my second gen camaro. The kit was specked out at 400hp and I made 423 hp on the dyno !

Just some suggestions. Good luck
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Old 06-24-2012, 12:49 PM   #3
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350 sbc 300rwhp Id get a set of aluminium Vortec style heads with 2.00int 1.55exh valves to start & if you need to keep emissions compliant Upgrade your injection system to a miniram or any of the systems out there. Dont get to silly with a stall if your pullin stuff with it. A cam just a hair bigger than a LT4 hot cam will getcha there. IF you dont want a bigger cam than that the LT4 hot cam will getcha pretty close Rebuild the motor with 10.8 to 1 compression Or you can get a Vortec top end kit at Jegs with Iron heads pretty cheap
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Old 06-24-2012, 07:50 PM   #4
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Add a small nitrous unit in a few hours on a weekend. Use it when you 'need' it is the fastest way to 300.

If it has the TBI motor, those were "high swirl' heads...some poor GM plan gone awry. You can get some vortec heads and intake, but, they flow so much more air, you have to re-tune the TBI or it WILL BURN VALVES because it would be so lean. Wanna' ask me how I know....?
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Old 06-25-2012, 12:36 PM   #5
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300 is not that tough.
This would get you pretty close.
http://www.chevyhiperformance.com/te...ade/index.html
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Old 06-25-2012, 03:09 PM   #6
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Add a small nitrous unit in a few hours on a weekend. Use it when you 'need' it is the fastest way to 300.

If it has the TBI motor, those were "high swirl' heads...some poor GM plan gone awry. You can get some vortec heads and intake, but, they flow so much more air, you have to re-tune the TBI or it WILL BURN VALVES because it would be so lean. Wanna' ask me how I know....?
He stated no nitrous.

You are right about the heads though. 4500rpms and they are done flowing.

It will be time consuming and a little on the expensive side to try to get the TBI to 300hp at the crank let alone get 300 at the wheels. I am an EFI proponent, but a carb with some better heads and a cam will get you the 300 whp you are looking for. To got to a different EFI setup will be costly no matter what it is. The most cost effective one I did was throw a 350 TPI motor in a truck like yours with a few bolt ons and with all that low end grunt it became the best truck towing motor that never made it into a truck.

Here is an article of a 305 that was done up and made 257 rwhp but alot had to be done.

http://www.chevyhiperformance.com/te...i/viewall.html
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Old 06-25-2012, 03:23 PM   #7
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The biggest question is What is your budget? Some factory Vortec heads along with a good cam and headers will get you close.
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Old 06-25-2012, 03:31 PM   #8
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Fastest way to 300 horsepower would be drive the fastest thing you own to the nearest junkyard, pick up a 5.3l, and put it in there. Quickest, cheapest, most reliable thing you can do IMO
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Old 06-25-2012, 03:45 PM   #9
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Fastest way to 300 horsepower would be drive the fastest thing you own to the nearest junkyard, pick up a 5.3l, and put it in there. Quickest, cheapest, most reliable thing you can do IMO
Exactly what I did. You will get 400 hp in a LS faster than you will get 300hp in a GEN I engine. Plus a good 18mpg in fuel.
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Old 06-25-2012, 09:23 PM   #10
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thanks for the help i think im going to do a nice carb heads cam set up
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Old 06-25-2012, 11:14 PM   #11
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Meet my 94 GMC:

Click the image to open in full size.

Engine,2009 4.8 400$, ignition controller from MSD with harness, 330$, intake for carb conversion, 270$, carb used off Ebay, 80$, swap headers from schoenfeld, 269$ shipped, conversion plates off Ebay 60$ shipped, bypass style regulator so i could use the factory fuel pump, 60$.
Total for a engine that started with 305 HP stock: Just under 1500$.

With intake and headers, i am sure it has added 30-50 HP, i was intending to do a 5.3, but ended up not being one. Didnt car, bear the snot out of it daily to 6000 RPM and screams:

Click the image to open in full size.

And the stock Tach with a new motor:


So, build a better engine, or get a junkyard 5.3 that will make more and be more dependable.
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Old 06-26-2012, 08:42 AM   #12
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Originally Posted by RabidStreetRacer View Post
The biggest question is What is your budget? Some factory Vortec heads along with a good cam and headers will get you close.
This is it right here. I have bascially a rebuilt stock 350 with ported Vortecs/Air Gap intake/Long tubes/Hyd roller cam

Engined Dynoed at 425hp/440ft lbs

The Vortecs are the best bang for the buck!
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Old 06-26-2012, 08:47 AM   #13
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Exactly what I did. You will get 400 hp in a LS faster than you will get 300hp in a GEN II engine. Plus a good 18mpg in fuel.
Ehhh....I wouldnt say that.

Small Block parts are CHEAP! Compared to an LS.

BTW...Its the overdrive transmission that gives you the mileage, not so much the engine.
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Old 06-26-2012, 08:55 AM   #14
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Quote:
Originally Posted by 02anti_vnm View Post
Fastest way to 300 horsepower would be drive the fastest thing you own to the nearest junkyard, pick up a 5.3l, and put it in there. Quickest, cheapest, most reliable thing you can do IMO
/\ this.

course it really depends on how much you wanna spend.

...i forgot the rest of what i was gonna say after looking at 02anti_vnm's

avatar.
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Old 06-26-2012, 09:39 AM   #15
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Ehhh....I wouldnt say that.

Small Block parts are CHEAP! Compared to an LS.

BTW...Its the overdrive transmission that gives you the mileage, not so much the engine.
I picked up my running 5.3 for $650 with everything, Stock it has 295 HP. Where can you get a GEN I engine for that price with that power.
GEN III engines are way more efficient than GEN II which help them use less fuel. My 1994 Silverado has a 4L60E with a 5.7 TBI. I guarantee you when I put my 400+hp 5.3 in, i will get much better MPG than the 13 I am getting now.
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Old 06-26-2012, 10:28 AM   #16
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thanks for the help i think im going to do a nice carb heads cam set up
As mentioned, budget is a key element. Ditching the TBI and the heads, for carb and at least Vortec heads would be great for power but you'll never get the gas mileage. Have you considered going TPI?
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Old 06-26-2012, 10:48 AM   #17
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Ehhh....I wouldnt say that.

Small Block parts are CHEAP! Compared to an LS.

BTW...Its the overdrive transmission that gives you the mileage, not so much the engine.
Oh...it's more than the transmission. That LS PCM or computer is a very powerful engine management system. It's been adapted to Gen I motors with awesome result. http://www.eficonnection.com/eficonnection/24x.aspx

I tell ya....I used to be a hard core Gen I guy. I built Gen I motors that slap SLP and SS Camaros so hard it wasn't funny. But they would idle all day long and pull such generous gas mileage numbers for the performance, that I took notice quick. I'm a convert now because you can pick up Gen III motors so cheap now and parts are actually as cheap if not cheaper than Gen I. I can pick up a set of factory ported heads from Texas Speed that will out-flow a set of Gen I AFR Eliminator 195cc heads for the same price. Factor in the FAR better quality of castings in the factory blocks and better main cap architecture and I have to tell you....you're beating your head against the wall trying to match the Gen III and Gen IV stuff.
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Old 06-26-2012, 10:58 AM   #18
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If you go carb make sure you get a good fuel pressure regulator with a return port. Here is the one I got:
http://holley.com/12-841.asp
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Old 06-26-2012, 02:11 PM   #19
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BTW...Its the overdrive transmission that gives you the mileage, not so much the engine.

Eeeeehhhh, I wouldn't say that either. I had a 77 Formula Firebird with a 455 that got over 20 on the highway. Had a TH350 NON o/d tranny.
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Old 06-26-2012, 05:09 PM   #20
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The old vortec heads were the best you could get from GM for a sbc before they killed the gen I. But, to find a set of those heads used for 200 would be a good deal, then a valve job and new seals just to freshen them up will put you at 400$ plus, that is what the whole 5.3 will run you at the junkyard. Still would be a lesser flowing head. A vortec intake and a ignition that is worth a crap is another 400$ give or take new. The ignition and intake for the Ls new will be 600$ and it is complete. 1000 for 350 hp, no cam. The 800$ for the vortec "start" of a build leaves you without a short block, which is a while different ball game and allot of money to freshen or build.
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