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400 horse 2 bolt main chev 350

 
1991blazerk5
I love my Chevy Chevette!
Posts: 7
Joined: 11/08
Posted: 11/03/08 08:09 PM

well il start out by giving a brief description, this is a truck not a car
i have a 1991 chev blazer k-5
350 motor 2 bolt main
id like to get 400 horse out of it i have 3.42 posi front and rear end
i have a block to build for this truck just wanted to know if anyone could give me some ideas
hoping to get 400 horse out of this as well
if anyone has some insight on transmissions and a good idea for it id love to hear
im looking for what i will need from front to back up and down
anything between the oil pan and throttle body  

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55Guy
Big Block power for the win
Posts: 895
Joined: 08/07
Posted: 11/05/08 06:05 AM

To get that much HP, you'll need a compression ratio near 10:1. The right head/cam combo will get you 400 HP.

But, for a Blazer like yours, I'd recommend looking at building the motor for torque. You want something that's gonna make a ton of torque at lower RPMs to turn the 4x4 running gear and for off-roading.  

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DeuceCoupe
I love my Chevy Chevette!
Posts: 7
Joined: 11/08
Posted: 11/05/08 06:47 AM

Suggestions to plan!
Having done this a couple times myself with a heavy 4x4 I'd suggest first:
1. Fill it with gas and weigh it. That will give you an idea of what is realistic from 350 inches.
2. Why do you want 400 hp, in other words how quick/fast do you want it to be? No sense being disappointed many dollars later, it is hard to make something that heavy "fast".
3. With all that said, if a rebuild is in order anyway, for a few bucks you can do quite a ***

My main suggestion would be to make the engine "look" bigger. That is:
1. Think about a 383 stroker kit, so along the way you get new pistons, rods, crank anyway.
2. Smog permitting, add long tube 1-3/4 headers, they will add torque all across the band.
3. Today's cylinder heads are great, they make the whole engine act like a bigger one - add torq and power too. AFR, Edelbrock, Protopline, Dart, World, they will make your 383 behave like a 427 of the 1960s. Grin
4. Compression is great but the truck will load it hard so watch out for knock, it's not like a Vega where you could get away with excessive compression. In the high-9s should be ok, 10.0 would be iffy on pump gas.
5. Dont overdo the cam - you will now have a mountain of torque (more literally, horsepower at the bottom of the shift) which will make the truck pull, don't ruin it with a soggy cam.
Power at 6500rpm will not make up for a bog off the line. Frown  
I'd use an .050 duration about 215-220.

Lots of mag dyno articles out there so you can see what heads to use, etc. ETEC's take a special intake but they are good so consider that if you want to change intakes too.  

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1991blazerk5
I love my Chevy Chevette!
Posts: 7
Joined: 11/08
Posted: 11/05/08 03:48 PM

well the main reason im looking for atleast 400 is my top end
im having problems around the 110 mark and all round feel that the truck is underpowered
i hada 2 wheel step side with 320 horse that made me happy
so with the weightt difference, (my truck is roughly 7000 pounds) i think 400 should be good
i was also concidering vortec heads, im told they would be able to help me get to were i want
i want to keep low enough compression as this is still my daily driver and dont want to spend millions more on fuel then i already do  

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firefarm
I love my Chevy Chevette!
Posts: 9
Joined: 09/06
Posted: 11/06/08 09:03 AM

Better check your scales...  

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1991blazerk5
I love my Chevy Chevette!
Posts: 7
Joined: 11/08
Posted: 11/06/08 10:27 AM

just trucker scales
why ?  

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GibTG
I mow my lawn and find Chevys
Posts: 1985
Joined: 10/03
Posted: 11/06/08 02:18 PM

Problems around 110...

You're barking up the wrong tree.  
~Gibs

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shootnrats
My first time was in a Chevy
Posts: 177
Joined: 08/08
Posted: 11/06/08 02:48 PM

you have a way with words....LOL

must be the 110' mark.....  

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1991blazerk5
I love my Chevy Chevette!
Posts: 7
Joined: 11/08
Posted: 11/06/08 03:26 PM

well i can only read the numbers on the scale
wasnt me who calibrated it,
either way, the weight is not my primary concern  

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JW454
I have an SS396 tatoo
Posts: 345
Joined: 07/08
Posted: 11/07/08 03:35 PM

The way an engine is set-up is largely based on the weight of the vehicle, so it should be a primary concern. Like another user said, horsepower is pretty meaningless in a heavy vehicle and it should be a large torque figure that you build for. I really dont think that scale is anywhere near accurate for your vehicle seems my 1976 1 ton crew-cab dually with 454 and 4-wheel drive weighs roughly 6500lbs. Maybe 4800-5000lbs for your Blazer.  

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GibTG
I mow my lawn and find Chevys
Posts: 1985
Joined: 10/03
Posted: 11/07/08 04:51 PM

Please don't say that, horsepower is never meaningless...  
~Gibs

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JW454
I have an SS396 tatoo
Posts: 345
Joined: 07/08
Posted: 11/07/08 09:26 PM

All I am saying is torque is far more important to satisfying the needs of a 4x4. As you know, when a vehicle is built for a broad torque curve, it has a much more useable powerband than a peak horsepower figure.  

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stempak
V-6 Camaros rule!
Posts: 47
Joined: 11/08
Posted: 11/08/08 12:22 AM

Your not going to be able to beat the new "bowtie" vortec heads for 700 bucks brandnew ready to go, Unless you can find some heads used. Those new vortecs can handle up to .530" lift out of the box were's the older style was like .420" max not much. some headers a mild cam or a comp 4x4 cam. A airgap intake and you should be at 400hp. A big 4x4 is never going to be really fast with all that weight but putting these parts on should make a big differnce and should be worth around 100 or so hp!

The tranny you want a shift kit and cooler.  

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stempak
V-6 Camaros rule!
Posts: 47
Joined: 11/08
Posted: 11/08/08 04:06 AM

383 would definately be a good build for your spare motor and with the mentioned parts you'd probably be at 450hp and 500ftlbs of torque  

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brown97396
I love my Chevy Chevette!
Posts: 2
Joined: 11/08
Posted: 11/08/08 03:36 PM

well i have a 48 willys with a sbc in it i use for mud drags and it is 4 whl drive and weighs lots less see's no street time but then im pushing 890 horse at the crank out of it so as to not needing horsepower that is in your own opinion you can never have to much of either  

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