The power of a V8 from a V6

Most Chevy V8's Have only 220 to 270 hp from the factory. The mighty Z28 from the early ninety's has maybe 250 hp at the rear wheels and that is on a good day. We have anywhere from 170 to 190hp at the crank under optimal conditions . That being engine out, on a dyno with perfect intake air temp and full acc. The advantage of keeping your v6 . The v6 4.3 is basicly a 350 v8 engine with two cylanders cut off. Many part's of the v8 350 can be used on our 4.3 v6. I know this because I use the pistons the rockers the valves and a few other internals on my v6, our engines are capable of insane horsepower. one engine comes to mind ,there is a v6 twin turbo typhoon that has close to 1000hp!! Another Blazer that I don't want to go against is also a v6, it is called the Ghetto Sled. Look it up on the internet and go to Race proven Motors, you can watch the video's .

heres a 1,200hp syclone;
http://gmhightechperformance.com/features/0510htp_sy/
i was watching trucks one morning and they had an S10 SS truck with a 400hp all motor cpi 4.3. that was cool. I agree that there are benefits from building the v6.

multiport 350s have up to 315 horses bone stock, while the 4.3 multi port has 180 or so, it all depends on how the beast is fed

This is a build up of a very early v6, Some of the mods are now standerd on 97 and above vortec's. Remember this is a early engine!
Http://www.hotrod.com/techarticles/engine/113_0208_v6/index.html

Thats a great article. I bookmarked the page so I can print it when I decide to rebuild the engine. Thanks again

good job on finding this.....

haha they got their info wrong on the CPI though....... That was introduced in 1992

98 blazer hoodlatch wont open

98 blazer hoodlatch wont open Welcome to Automotive Forums.

Try pulling the lever and then bumping the driver's side front corner of the hood with your hand. If it opens, oil the latch, and you should be fine.

If you still need help, click here to start you own thread:
http://www.automotiveforums.com/vbulletin/newthread.php?do=newthread&f=119

Everyone, please wait until johnbman has started his own thread before replying, so that this thread can remain on topic.

lol i hear ya on the hp from the 8. i got 220 lol and it was only on road for an hour lol.

owtch

Question for you Blazer SS, How long does a 400hp 403 last?

Personally I can't see the bottom ends bearings lasting all that long, even with Synthetic oil.
But if you figure it'll last as long as a 400hp 406 it might be something for me to consider for 1 of my rods

I like what I have done to my 4.3 . What little I lost in economy , I gained in reliabilty and drivability . But I was battling a throttle body FI problem for over a year . 2 top mechanics and myself could solve it . Now I can lite up my big tires with little effort . I still have the HP cam to install when I HAVE TO . But I can wait . When I do , I will change the valve sizes and the rocker ratios to 1.6 . Rob

Okay where do I start? First of all the 1.6 roller tip rockers are the best thing to do for waking up a vortec's cam. the stock camshaft is not bad at all. The Problem is with the stock rocker arms, they are of poor quality stamped unbalenced and unmatched for rocker opening ratios. They can be way off, they are stock at 1.5, but with the factory tolerences they can actualy read 1.4, meaning some valves are opening properly and some aren't, Just imagine 6 buckets sitting under 6 faucets, Now open all of the faucets at the same time, now since the faucets are not balenced some of the buckets will fill up faster and slower than the others. Now the buckets are your pistons and the faucets are your valves, How do you think a engine will work if a few of the piston chambers are full and some of them are not?
Now after market rocker arms are way better in the quality department, If they say 1.6 ,believe me they are close to it. This is for the two major Crane and Comp. And remember the later models of vortecs are non adjustable, meaning that you just tighten down the nuts until it stops and walk away. You can change all of your rockers in less than an hour! All for around $170.00 remember to get metric rocker balls, they don't come with the kit.

I have 383hp at the rear wheels from my V6 and it is a 4x4, to run that much power I have forged everything and with the upcoming nitrous and the stroker kit, I Will see a lot more than this, You really have to pay very close attention to tolerences! It is the difference between something lasting and something sitting in a oily heap of smoking metal.

God! I just read my post,do I sound like a windbag or what ? What I was trying to say (factory rockers BAD) Aftermarket GOOD. I love my Blazer the size is perfect and the power is great, Just when I start talking about engines I get a little carried away. I had a factory bottom end for a long time and It carried the power well, I switched for future upgrades and I still use the original 4L60 that came with it. Chevy Does make GOOD things. I mean Have you ever driven anything that handles like a Blazer in the snow? I tried to get it stuck, I couldn't do it!

Chevy Does make GOOD things. I mean Have you ever driven anything that handles like a Blazer in the snow? I tried to get it stuck, I couldn't do it!

A friend of mine got his Blazer stck in about a 3' snow bank. (It's now 1 of my parts Blazers)

Then he remembered that it's 4wd

That's when he discoverd that it was posi. (I wish that he would have left the posi on)

Okay where do I start? First of all the 1.6 roller tip rockers are the best thing to do for waking up a vortec's cam. the stock camshaft is not bad at all. The Problem is with the stock rocker arms, they are of poor quality stamped unbalenced and unmatched for rocker opening ratios. They can be way off, they are stock at 1.5, but with the factory tolerences they can actualy read 1.4, meaning some valves are opening properly and some aren't, Just imagine 6 buckets sitting under 6 faucets, Now open all of the faucets at the same time, now since the faucets are not balenced some of the buckets will fill up faster and slower than the others. Now the buckets are your pistons and the faucets are your valves, How do you think a engine will work if a few of the piston chambers are full and some of them are not?
Now after market rocker arms are way better in the quality department, If they say 1.6 ,believe me they are close to it. This is for the two major Crane and Comp. And remember the later models of vortecs are non adjustable, meaning that you just tighten down the nuts until it stops and walk away. You can change all of your rockers in less than an hour! All for around $170.00 remember to get metric rocker balls, they don't come with the kit.

I have 383hp at the rear wheels from my V6 and it is a 4x4, to run that much power I have forged everything and with the upcoming nitrous and the stroker kit, I Will see a lot more than this, You really have to pay very close attention to tolerences! It is the difference between something lasting and something sitting in a oily heap of smoking metal.



Any idea on how much power can be gained by switching out the stock rocker arms for some aftermarket ones?

The only downside to building up a V6 is you wont get that bad ass V8 sound........

i thought 10-20 maybe i thought only around 10 though. WOW mine is gay then cuz its quiet well for now cuz i dont have all the exhaust on.

The only downside to building up a V6 is you wont get that bad ass V8 sound
Mine sounds really good with seperated duals and an Edelbrock 4 barrel . deep rich rumble with a throaty moan when I open up the secondaries . Rob

10-20 sounds about right. The real improvment is in the throttle response. and power band. You will also see a slight improvement in gas mileage but that will be after a few weeks after you stop playing with your trucks gas pedal.

Next big issue The valve springs!! Unless you keep your engine above 4000rpm don't worry about them, but if you do , float is the issue, the seat pressures are way off. Again only worry about this if you plan on running your engine in the upper ranges and you plan on pulling the heads.

The easy upgrades should be done first ! ie: Intake and exhaust. Just for economy's sake if you dont want an ebay intake (although I highly recommend them) cheap and they work! JUST DO NOT OVER OIL THEM!! AND LET THEM DRY!! BEFORE PUTTING THEM BACK IN!!! Just cut a much bigger hole in the bottom of your intake box. Cost nothing and helps your truck at pull off and highway speed. Not to mention you get that nice intake sound!

Next the throttle plate mod. Cost nothing and adds so much. Just takes about 30 minuts of your time.

By the way, next time you are under the rear of your Blazer, run your hands over the length of the exhaust (engine off and cool) ad check for that nice big kink that most 4x4's have. Restrictive, I think so!

[QUOTE=Blazer SS]
Next the throttle plate mod. Cost nothing and adds so much. Just takes about 30 minuts of your time.

QUOTE]

What's this throttle plate mod you speak of? What years and engines will it work on? How bout a link so i can do it cause there is no such thing as too much power.

Something else you can do for very little money, Underdrive pulleys! Look for the three piece set, If you have a aftermarket stereo system that needs a lot of power make sure that you get the right set. They work like this, Picture your self riding a bike up a hill, you are pedaling in a hard gear, lot of work isn't it? Now switch gears, Gets a lot easier right? Now in a hard gear you had a big gear and a small gear, the big gear being on your crankshaft and the small gears being on your wheel (acc.), for your engine to work with less effort lets put a smaller gear on the crankshaft and bigger gears on your wheels (acc.). Less work for the engine gives you more HP. Remember that for everything good sometimes there is a penalty. This beeing some of your (acc) may turn slower, the water pump, the alternator, Being at the top of the list. CHOOSE THE RIGHT KIT!!

Blazerman I know it sounds silly, But I have done it myself, please check to see if your intake gaskets are on the wrong sides. They fit both ways, But if they are Backwards they will block off your coolant passages, preventing coolant flow thru your engine. And It will cause severe overheating!!

March Power and Amp Series Pulleys like around 100 from summit but this is kinda like the roller rockers in that the HP gain from the cost of mod unless you are going all out has to be addressed.

Well we had a set on and then he swapped in a set of his. We got it narrowed down to what im gonnna do to it. Ill put that in my thread so as not to whore this one.

This shows the performance potential of our baby v8's, as I said before and hope that you understand ,keep your v6's less headaches and the power is there. please click on this link to see what I am talking about

http://www.hotrod.com/techarticles/engine/113_0210_blown/index.html

http://photobucket.com/albums/c391/Blazer111/

http://www.hotrod.com/techarticles/engine/113_0208_v6/index.html

Great stuff. :thumbsup:

Thanks again SS , I enjoyed this knowledge . Rob

i was watchin trucks on spike a few weeks ago and they had an s10 with the cpi4.3 that was making 300-400hp NA and runing 11's. There is deffinately alot of potential in these V6's.

What I like is that they got the RPM's way up there. Considering mine redlines at like 5200 or something like that. I love a high reving engine!!!

Unlike a v8 it seems that the v6 keeps building HP all of the way to redline. The v8 seems to leval off and then drop, the v6 keeps on going!! The lighter weight and being designed to fit in the Blazer makes this a win win situation.

Just one easy thing to do, invest maybe $160 into the engine and get 1.6 roller tip rockers, replacment is really easy!! It is the most Bang for the bucks! Will really wake up the factory cam!!

So if someone with a stock system was going to do some upgrades like this, what would be the top three easy things to do?

I have done nothing to my 94 blazer except the ususal intake and exhaust, but this topic excited me ;)

Check out ( Real performance from a v6 vortec) I have contributed a few posts that deal with just the performance aspect of our Blazers. I think if you do a search you can find most of them.

So if someone with a stock system was going to do some upgrades like this, what would be the top three easy things to do?

I have done nothing to my 94 blazer except the ususal intake and exhaust, but this topic excited me ;)
im with skeeter, what are some good performance upgrades for blazers older than 96 besides intake and exhaust? cpi engines in perticular.

the thread "real performance from a vortec V6" only talks about performance for 96+ engines.

ROLLER ROCKERS!! The adjustment is just as easy, the correct way and the easy way, the easy way is to install the rockers and start your truck with the covers off, tigten the set screw till the tapping stops on all of the rockers then hose off your engine, there will be quite a lot of oil on the sides. This is only for the non adj early engines! Cost between 100-200$ for the full rollers.

Ebay has a torque booster camshaft listed and they are cheap! For non balence shaft engines. The early engines have much more on the aftermarket for performance.

They may not have hand held programmers for your engines but they still have a whole lot of chips that go into your ecm's or between the ecm and the harness.

If you don't want to go for the aircharging option, go with the internal upgrades, increase your compression!

ROLLER ROCKERS!! The adjustment is just as easy, the correct way and the easy way, the easy way is to install the rockers and start your truck with the covers off, tigten the set screw till the tapping stops on all of the rockers then hose off your engine, there will be quite a lot of oil on the sides. This is only for the non adj early engines! Cost between 100-200$ for the full rollers.

Ebay has a torque booster camshaft listed and they are cheap! For non balence shaft engines. The early engines have much more on the aftermarket for performance.

They may not have hand held programmers for your engines but they still have a whole lot of chips that go into your ecm's or between the ecm and the harness.

If you don't want to go for the aircharging option, go with the internal upgrades, increase your compression!

-What year(s) are u refering to when u say early engines? do they have cams for 95 cpi engines (i have not come across any)?

-yea they do have chips for the cpi engines but all they do is dump more fuel into the engine to make power and require u to buy high grade gas. less gas mileage + $3.00+ per gallon = i ain't doin it. I've also heard that (on a 95) if u get the ecu reflashed to full OBDII, u can use a performance programer. i have no idea if this is true or not.

Another Great article for the 4.3!!!!http://www.sporttruck.com/techarticles/132_0110_powr/

seems like all the magazines testing/moding the 4.3 are using a carb setup. find any articles where they kept the fuel injection?

Okay I will post some late model engines, For a few cpi upgrades go to Summit Racing, and do a search by your make and model. They have intake throttle bodies that help with breathing along with camshafts, rockers, pistons, lifters, and if you don't want to go with chips for your ecm, think about moduls for your trans shift points. Plus the articles seem to be a few years old. there are a lot of late model 4.3 performance engines out there I will make a point of listing them.

Been away for awhile! There are a lot of new parts for the v6, Seems that our engine is very popular for the Toyota and Jeep swaps!

If you have a TBI engine check out some of the new throttle bodies! They are ported and the injectors flow better.

They also have a CPI ported throttle body, You already have the multiport injection, there are several things that you can do to increase the flow rate.

For the later engines WOW! I use a ported throttle body that believe it or not is opened up to 58mm! I had to increase the opening of the plastic intake bell!! They also have the updated spider that uses mini injectors instead of the poppet valves. I don't however recomend them if you want the performance angle. They flow about the same as the poppets, But the poppets can actually flow more. Get these if you want fuel economy and precise fuel metering. A better and crisper throttle response with the new spider, and better gas mileage!! Not the best for performance!! Less GAS!

If you plan on running your truck at all (time slips) GET TRACTION BARS!!!!!
I know that in the pic's you don't see them on my Blazer. I think I installed them right after the last set of pic's. When watching my launch videos before I installed them at launch my rear end dropped close to eight inches or more!! Wasted power and time along with traction!! Wheel hop sucks!!