4.3 vortec?

[Aarons72s]

I have 2 4.3l v6 astro safaris. I like them. I think 94 or 95 was the last year for the tbi, z code, engine in them. The 94 is tbi and the 99 is mpi. Truthfully I like the 94 better. Fills and drives like an older truck. I can sit and roast the tires in both of them all day long. The 94 did throw a rod but at 150,000 miles and it is a ex rental car so no real complaints. only cost 2,500 bucks for the dealer to put a new motor in 2003 and havent had a problem since. I agree go with the aftermarket harness, oe one has to much bs to by pass. Correct me if I am wrong but when I looked at one 4.3 out of a vehicle it looked like the motor mounts were further back than the v8 mounts? Hope this helps.

[texanidiot25]

This is the 1998 4.3L V6 from the GMC Jimmy. I think that was the year they switched to TBI.

[Primer69er]

ok, i talked to the guy, its in a 1993 2wd blazer...i didnt know 93's had vortec, but anyway he described the top to me and it seems like it is the same as the pic i posted, but anyway he told me, for $300 i can have the whole truck!! it runs and drives, and has no problems except for it doesnt have a title, and is impossible to get one. (previous owner died, and family doesnt want the truck but will not sign the title.)

so now my new questions are these
1. can i use the power steering components on my truck
2. how about the power brakes, booster and master cyl.
3. can i use the front end, to convert mine to 5-bolt disk?
4. what would i need other than the dash vents to hook up ac using the blazer parts?

[Primer69er]

okay, sweet, i found a 93 on ebay with the vortec, so now i know what it looks like.

[Dean]

The engine in my Chevette race car/street machine started life as a 85 4.3 but it is far far away from stock now. I'd hate to add up how much I have in that engine.

[Primer69er]

okay, so i have looked around, and i think the rear end of this s-10 is 3" shorter then my current one, if so will that matter? can i put it on my truck? that would be sweet. anyone know what length drive shaft i need?

[Aarons72s]

Primer69er, for your title thing. Down here in oklahoma we have what is called title 42. Ie for something like your situation. You just have to have the car for a period of time then file the paper work. You list how much you have in it, always alot no matter what. And after 30 days if no one protests or claims it it is yours. You may ask your tag office about what they can do in kansas. Good luck.

[longhorn71]

painless performace make the harness for the 4.3 vortec.
wehave had the 4.3 tbi injection s-10 and a 94 4.3 vortec cpi injection(central port injection)just like the 98 under hood pic above.the cpi unit has way more power then the tbi one and gets good milage

why not swap the 4.3 into it?chevy ran this engine in the fullsize pickups and vans for a lot of years.I think your milage would be the same or a little worse then a 350 in your truck tho.


if you do make the swap the best way is with an aftermarket harrness,I'm not sure on the instructions for the 4.3 harness.the 6.0liter harness is all plug in play other then 4 wires.

[texanidiot25]

CPI? Ive never heard it called that before, always TBI.

Its makes (for 98 atleast) 190hp and 220 ft lb of torque. Does well until about 4500 rpm, then it falls dead almost. But its a little beast in the low end. Redlines (stock) at 5500.



edit:
The only thing I dont like about this engine, atleast while its in the GMC, is that is a bit of a PITA to work on because everything is so tightly packed in. In our fullsize trucks that wouldnt be a big deal, and Im sure theres a accessory kit to mount everything a little farther apart. It took way longer than I wanted it to, to get the serpentine belt on, just because there was no real easy way to the belt over the idler pully. And the PITA spark plug, i think its #3. But again, in these trucks all that shouldnt be a problem.

[Primer69er]

okay, so i think the cpi is the one with the big plenum on top that says vortec-
and the tbi is the one that looks like a carburator, with a plastic tube on top-
because i know a tbi doesnt have a big aluminum intake mainifold looking plenum on top.
so anyway, my wife wants me to get the blazer. and i think it has plenty of parts i could use on my 69. so i think, since its there, i might as well use the motor. mornings like this my 250 barely cranks. fuel injection sounds great to me. its not a hot rod, and this old piece of crap l6 spits and sputters when it hits 1500rpm. so im sure the 4.3 will have enough torque for me.
if anyone knows of someone who actually did this, and documented it. i would love to see it. from what i hear there are a few things i need to do to run the 700r4. plus i have been told to take the ecu in and have them delete certain parts i dont need. and i apparently need a shorter drive shaft. and i would also like to know if i can use the rear end from the blazer, or atleast the internal parts, mine wont travel above 55. thanks for everyones help. i will get pictures as soon as i get the blazer

[cooters]

keep in mind that you would have a 4L60 not a 700 r4 in 93 so if you use the tranny you need a harness for that to. A 4.3 uses the same mounts as a 350. As for using the rearend, i dont think i would use it as for sure it is narrowe
r

[68haywagon]

That second picture is not a TBI. It is the SFI setup. The TBI looks some what similar to that but the throttle body is much larger. If it wasn't so cold out I'd take a pic for you to see.

Mike

[Troy-Built]

In mid 91 they started both versions of the 4.3. The CPI version with a W vin code and the Z code that's still throttle body. The Vortec designation was started when they went to a balance shaft above the camshaft and stronger connection rods and pistons. The early 91 and earlier 4.3 had a traditional style timing cover like a small block. The late 91 and later timing covers were taller to accomodate the balance shaft. You can get both vin code versions of the 4.3 until 96 when they came out with the plastic intake manifold version that I believe is a vin W also. The throttle body version is 160 horse and the CPI version is 190 or 195 depending on the application. As far as the transmission they had 700R4 until 92. Then they went to the 4l60E.
You can keep the whole serpentine system on the front of the motor and use the power steering pump. You may have to use a fitting from an older pump to adapt the pressure side of the pump since the S10 is o-ringed and the box on our trucks isn't. Your frame towers may be in the right spot for the V6 already. Just get the 350 motor mounts to bolt to them. As far as using the rear end and front brakes DONT. The rear and is 7 1/2 or 7 5/8 ring gear and definitely won't hold up and the brakes won't handle the extra weight. There are enough people on this board that have better geared rear ends laying around and front disc brake set ups to spare that can save you the headaches. You might even find someone looking for a 2wd blazer to trade for the truck parts you need.

[Huck]

Bought a full size GMC 1.2 ton LWB in 91 with the 4.3. Other then the anti-knock sensor going out at 40K miles and not fixing the problem for 60K miles, it ran great. 20mpg, pulled trailers, etc. They are more expensive rebuilt then a new crate 350 so keep that in mind.

[Primer69er]

Originally Posted by Troy-Built

they had 700R4 until 92. Then they went to the 4l60E.

this is a 93, but he assured me it was a 700r4, is he wrong or was 93 the last year? what would i look for to verify it is infact a 700r4?

[texanidiot25]

I looked down into the intake today, it is CPI. TBI would have the injectors closer to the throttle. You learn something new every day.



The 4.3 redlines at 5500 rpm. So take that into account.

Originally Posted by RACINJASON22

Ratio = (rpm x tire diameter) divided by (mph x 336)

RPM = (mph x gear ratio x 336) divided by (tire diameter)

MPH = (rpm x tire diameter) divided by (gear ratio x 336)

Tire Diameter = (mph x gear ratio x 336) divided by (rpm)

But if I were you, Id stick with the stock rear end. Unless you want meatier tires, you would need to get a set of rims that have the off set so that the tires arent so far into the fender if you used the blazer's axle. Which I think is shorter by a few inches.

As for engine numbers:

Engines:

* 1983-1984 - 2.0 L OHV I4, 2-barrel carbureted, 83 hp (62 kW)/108 ft·lbff (146 N·m)
* 1983-1985 - 1.9 L Isuzu I4, 2-barrel carbureted, 84 hp (63 kW)/101 ft·lbff (137 N·m) (California)
* 1983-1985 - 2.2 L diesel I4, 58 hp (43 kW)/93 ft·lbff (126 N·m)
* 1983-1985 - 2.8 L LR2 V6, 2-barrel carbureted, 110 hp (82 kW)/148 ft·lbff (201 N·m) (VIN B)
* 1985-1989 - 2.5 L Tech IV I4, TBI, 92 hp (69 kW)/132 ft·lbff (179 N·m) (VIN E)
* 1986-1993 - 2.8 L LL1 V6, TBI, 125 hp (93 kW)/150 ft·lbff (203 N·m) (VIN R)
* 1988 - 4.3 L Vortec 4300 V6, TBI, 150 hp (112 kW)/230 ft·lbff (312 N·m) (VIN Z)
* 1989-1992 - 4.3 L Vortec 4300 V6, TBI, 160 hp (119 kW)/230 ft·lbff (312 N·m) (VIN Z)
* 1990-1993 - 2.5 L Tech IV I4, TBI, 105 hp (78 kW)/135 ft·lbff (183 N·m) (VIN A)
* 1992-1993 - 4.3 L Vortec 4300 V6, CPFI, 195 hp (145 kW)/260 ft·lbff (353 N·m) (VIN W/Z)
* 1994 - 2.2 L L43 I4, MPFI, 118 hp (88 kW)/130 ft·lbff (176 N·m) (VIN 4)
* 1994 - 4.3 L Vortec 4300 V6, CMFI, 195 hp (145 kW)/260 ft·lbff (353 N·m) (VIN W/Z)
* 1995-1998 - 2.2 L L43 I4, MPFI, 118 hp (88 kW)/130 ft·lbff (176 N·m) (VIN 4)
* 1995 - 4.3 L LB4 V6, TBI, 155 hp (116 kW)/235 ft·lbff (319 N·m) (VIN Z)
* 1995 - 4.3 L L35 V6, CMFI, 191 hp (142 kW)/260 ft·lbff (353 N·m) (VIN W)
* 1996-1998 - 4.3 L Vortec 4300 V6, CSFI, 175 hp (130 kW)/240 ft·lbff (325 N·m) (VIN W)
* 1996-1999 - 4.3 L Vortec 4300 V6, CSFI, 180 hp (134 kW)/245 ft·lbff (332 N·m) (VIN X)
* 1999 - 2.2 L L43 I4, SFI, 120 hp (89 kW)/140 ft·lbff (190 N·m) (VIN 4)

http://en.wikipedia.org/wiki/Chevrolet_S-10_Blazer

Thats what Wiki says.

[Primer69er]

i found the wiring kit i need, painless part number 60210. cheapest is $360 i will probly end up buying it, but in the mean time i would like to try to wire my own up, im pretty good with wires, and if i could save the money that would be great. so does anyone know where i can find a diagram for the 93 vortec blazer, and for my 1969 c-10. i am hoping i could study both and then wire them together. the only thing is i have been told of a vehicle speed sensor that needs to be removed from the computer, anyone know of this??

man im really heading into uncharted territories here, i wish i could talk to someone who has actually done this before.

[gotchevys?]

Im also replaceing the 250 with a 4.3 vortec out of a 95 Astro in my 67 http://67-72chevytrucks.com/vboard/s...d.php?t=220663 If the transmission is out of a 93 the it is not a 700r4. The 4L60-E is basically and electronic version of the 700r4. This should give you some info here http://www.s-series.org/history/s10history.htm and http://s-series.org/content/view/12/28/

[Primer69er]

are you sure? even on the blazers? anyway if it isnt a 700r4 do i need to get a different one, or will this work also? does it need a special wiring harness?
basicly i am wanting to get all the parts from this blazer i can use, and then part the rest out. im thinking i can use the fuel tank to relocate under my bed, and then the fuel door on the side. any input on that?

[texanidiot25]

You can use the stock transmission. Just keep all the wiring and electronics it has with it, and you wont need to buy any extra hopefully. You'd have to mod the column shifter too, I think theres a linkage kit for that.

[Troy-Built]

Texan your 4.3 is MPI which means your injectors are under your plastic intake manifold. Also yours is a late 95 or later to have the MPI. Primer the 700r has a square plug on the driver side behind the shift linkage and 4L60 has a big round plug on the passenger side. Your tank on the blazer is behind the rear axle between the frame rails and will be needed for the in tank pump. The computer is held in with a 7mm head type screw in the vertical position behind the glove box. If you unplug the wiring from the computer and pull the grommet from the firewall toward the engine. (There is a U-shaped black plastic keeper holding it in place.) You can pull the wiring plug by plug through the firewall. As far as wiring diagrams you can buy a Haynes manual for each vehicle to decifer what you need. I am going to guess that your dash is digital. If so, you can get half of your money back if it is 100 percent functional.

[clay68c10]

For a good wiring diagram, check ebay for a GM factory diagram. I got one for my 454 TBI setup and it is WAY better than any chitlins or haynes crap. I think it was $35, iirc the seller was faxon auto literature. It shows the entire electrical system in detail and gives a nice pinout of the ECM/PCM so you know what you have and what to de-pin and remove if you don't need (like air injection).

[texanidiot25]

Originally Posted by Troy-Built

Texan your 4.3 is MPI which means your injectors are under your plastic intake manifold.

180 HP / 240 TQ (4wd) 4.3L CSFI V6 (Vin W).

http://www.s-series.org/history/jimmyhistory.htm

MPI was used on the 2.2L for some years I believe, but not the '98 4.3L.

[Primer69er]

Originally Posted by Troy-Built

Your tank on the blazer is behind the rear axle between the frame rails and will be needed for the in tank pump.
I am going to guess that your dash is digital. If so, you can get half of your money back if it is 100 percent functional.

are you saying that i will be able to use the gas tank for my truck? does anyone know where to find a mounting kit for that?

do most 93 blazers have digital dash? that would be cool, i would attempt to use it in my truck if it did

oh btw i still have not seen this truck yet. its a guy i work with, and so far neither of us have had the time to go see it. but he wants me to buy it today, so after work i will definintly see it.

thanks for all the info everyone, now i know what to look for before i buy it.

[texanidiot25]

The gauges were analog, but theres a kit by Dakota Digital that replaces them all with digital gauges.