4.3 Liter Vortec? - S-10 Forum
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post #1 of 137 Old 04-07-2006, 11:24 AM Thread Starter
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4.3 Liter Vortec?

Can anyone tell me how to tell if my 4.3 liter V-6 is a vortec or not?

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post #2 of 137 Old 04-07-2006, 11:25 AM
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Re: 4.3 Liter Vortec?

does it say vortec on the airbox???

thats the easiest way for the newer ones...if you have a CPI its pretty obvious too it says it on the intake....

what year do you have?

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post #3 of 137 Old 04-07-2006, 03:33 PM
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Re: 4.3 Liter Vortec?

if the manifold (intake) bolts go straight down its vortec, if they go in on an angle its not.
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post #4 of 137 Old 04-07-2006, 03:35 PM
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Re: 4.3 Liter Vortec?

Lol ya it really should say on it..lol

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post #5 of 137 Old 04-07-2006, 09:13 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by cdnrednk
if the manifold (intake) bolts go straight down its vortec, if they go in on an angle its not.
Wrong, Sorry but there were 1st gen vortecs and the bolts didn't go straight down, they went in on an angle like all the other 1st gen heads

If you have a 1st gen, the best way to tell is to pull the valve covers and get somebody to look up the casting numbers or pull the heads and take out an intake valve and look in the port
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post #6 of 137 Old 04-07-2006, 09:28 PM
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Re: 4.3 Liter Vortec?

You could try the vin number too

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post #7 of 137 Old 04-07-2006, 10:40 PM
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Re: 4.3 Liter Vortec?

92-95 cpi motors are vortec and the 8th vin number is a W

all 96 and up 4.3l's are vortec and they can either be a W vin or an X vin

there are also some tbi vortec's but they didnt start till around the 1994 model year that is a Z vin

ALL vortec motors will have these valve covers, it dosent matter if its TBI CPI or a 96> motor if they have a vortec head on them these covers will be present

Last edited by tippmann243; 04-07-2006 at 10:42 PM.
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post #8 of 137 Old 04-07-2006, 10:53 PM
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Re: 4.3 Liter Vortec?

older vortec's dont have those valve covers so noT ALL of them do....




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post #9 of 137 Old 04-07-2006, 11:12 PM
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Re: 4.3 Liter Vortec?

true, i was just comming back to edit my post saying all 94 and > vortecs will have those covers, i forgot they didnt come out till 1994
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post #10 of 137 Old 04-07-2006, 11:26 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by tippmann243
true, i was just comming back to edit my post saying all 94 and > vortecs will have those covers, i forgot they didnt come out till 1994
UH-HUH sure you were! j/k
funny thing you worded it that way seeing the ones WITHOUT those valve covers are the FASTEST vortecs CPI's RULE!!! lol

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post #11 of 137 Old 04-07-2006, 11:32 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by TnHombre
UH-HUH sure you were! j/k
funny thing you worded it that way seeing the ones WITHOUT those valve covers are the FASTEST vortecs CPI's RULE!!! lol
not always

back, oh so long ago, when my truck was stock, I was still beatiing my buddys CPI equiped s-10.

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post #12 of 137 Old 04-07-2006, 11:38 PM
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Re: 4.3 Liter Vortec?

Your buddies CPI was probably leaking lol j/k I love the CPI motor I made sure my blazer was a 95 so I got it. TnHombre how come you don't have the plastic vortec cover, I got one at the dealership for 10-15 bucks.
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post #13 of 137 Old 04-07-2006, 11:41 PM
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Re: 4.3 Liter Vortec?

Nope, its in top notch shape, still looks and runs new...actually a little better than new (its not stock)

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post #14 of 137 Old 04-07-2006, 11:42 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by TnHombre
UH-HUH sure you were! j/k
funny thing you worded it that way seeing the ones WITHOUT those valve covers are the FASTEST vortecs CPI's RULE!!! lol
cpi's are not the fastest vortec, most hp rating yes, fastest no
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post #15 of 137 Old 04-07-2006, 11:46 PM
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Re: 4.3 Liter Vortec?

if the 7th letter in the vin is "V" then yes it's a vortec

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post #16 of 137 Old 04-08-2006, 12:06 AM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by J..D
TnHombre how come you don't have the plastic vortec cover, I got one at the dealership for 10-15 bucks.
i have it.....thats a very recent pic...ive been in the engine bay ripping out the old factory harness's and just doing some overdue button up work.... also notice my upper fan shroud is off too. itll be back on......

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post #17 of 137 Old 04-08-2006, 03:20 AM Thread Starter
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Re: 4.3 Liter Vortec?

Ok a follow up, My 4.3 Liter I got from a friend who is hard to contact and I'm rebuilding it so there is no vin number, air intake, the bolts on the manifold are at an angle, and further more it does not say Vortec on or inside the valve covers. is there anymore thoughts.
--Thanks for your thoughts.
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post #18 of 137 Old 04-08-2006, 03:22 AM
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Re: 4.3 Liter Vortec?

what does it look like? and a year might help us help you.

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post #19 of 137 Old 04-08-2006, 03:57 AM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by 1fast4by
not always

back, oh so long ago, when my truck was stock, I was still beatiing my buddys CPI equiped s-10.

The first Time I dynoed (2.5'' flowmaster cat back,and drop in K&N) I was putting 170 to the tires, I think my truck is special
1fast... Im right there with you, I think mine is special too.. Im not sure about HP numbers, but with a drop in K&N and a Y-pipe I pulled 14.8 1/4 mile times

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post #20 of 137 Old 04-08-2006, 06:32 AM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by muklab
Ok a follow up, My 4.3 Liter I got from a friend who is hard to contact and I'm rebuilding it so there is no vin number, air intake, the bolts on the manifold are at an angle, and further more it does not say Vortec on or inside the valve covers. is there anymore thoughts.
--Thanks for your thoughts.
If the heads are off look in the intake port it's easy to tell, even easier if you pull an intake valve out.

PS all 94 vortecs did not have plastic valve covers, I have a 94 with a CPI motor that is vortec, owned it since new and the covers are steel. If you're going to say early still came with the steel ones and late didn't, that's not the case since it's a late model year one

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post #21 of 137 Old 04-08-2006, 07:36 AM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by TnHombre
older vortec's dont have those valve covers so noT ALL of them do....




NO ,NO, NO

just because it looks like that does NOT make it vortec or roller cam.

96 was a transision year some where and were not well what i consider TRUE vortec
with balanced shaft roller cam and vortec heads with bolts that go straight down through the intake.

in the 90's
some of the "VORTEC'S" like pictured above said VORTEC across the mid section of the intake BUT WHERE NOT VORTEC AT ALL they just had CPI. not even a roller cam.

but also there was some pictured like the one above there had a roller cam but pre-vortec heads and no balanced shaft.

but USUALLY the ones that say vortec on the valve covers did have at least a roller cam

except the one in my truck with vortec vavle covers and a 89 non-vortec engine.

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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by tippmann243
92-95 cpi motors are vortec and the 8th vin number is a W

all 96 and up 4.3l's are vortec and they can either be a W vin or an X vin

there are also some tbi vortec's but they didnt start till around the 1994 model year that is a Z vin

ALL vortec motors will have these valve covers, it dosent matter if its TBI CPI or a 96> motor if they have a vortec head on them these covers will be present
so thats what the valve cover looks like? mine is covered in oil......lol.

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post #23 of 137 Old 04-08-2006, 11:46 AM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by gpwrastler
if the 7th letter in the vin is "V" then yes it's a vortec
the 7th vin tells you the body type and the only numbers that are available are 3,4,6,8,9 so the 7th vin has nothing to do with motors you want the 8th vin like i said earlier

Quote:
Originally Posted by warrenp
NO ,NO, NO

just because it looks like that does NOT make it vortec or roller cam.

96 was a transision year some where and were not well what i consider TRUE vortec
with balanced shaft roller cam and vortec heads with bolts that go straight down through the intake.

in the 90's
some of the "VORTEC'S" like pictured above said VORTEC across the mid section of the intake BUT WHERE NOT VORTEC AT ALL they just had CPI. not even a roller cam.

but also there was some pictured like the one above there had a roller cam but pre-vortec heads and no balanced shaft.

but USUALLY the ones that say vortec on the valve covers did have at least a roller cam

except the one in my truck with vortec vavle covers and a 89 non-vortec engine.
so much misinformation

cpi motors arent technically a vortec motor but they ALL came with a balanced shaft and all had roller cams, my 89 tbi motor im rebuilding has a roller cam

the cpi motors also came with heads that flow WAY better then tbi heads

all in all the "vortec" name is just so the salesman can point and say hey look its got a vortec motor that means its got power
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post #24 of 137 Old 04-08-2006, 11:48 AM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by muklab
Ok a follow up, My 4.3 Liter I got from a friend who is hard to contact and I'm rebuilding it so there is no vin number, air intake, the bolts on the manifold are at an angle, and further more it does not say Vortec on or inside the valve covers. is there anymore thoughts.
--Thanks for your thoughts.
check the casting numbers on the heads or pull the numbers oof the block and run them
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post #25 of 137 Old 04-08-2006, 12:16 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by warrenp
NO ,NO, NO

just because it looks like that does NOT make it vortec or roller cam.

96 was a transision year some where and were not well what i consider TRUE vortec
with balanced shaft roller cam and vortec heads with bolts that go straight down through the intake.

in the 90's
some of the "VORTEC'S" like pictured above said VORTEC across the mid section of the intake BUT WHERE NOT VORTEC AT ALL they just had CPI. not even a roller cam.

but also there was some pictured like the one above there had a roller cam but pre-vortec heads and no balanced shaft.

but USUALLY the ones that say vortec on the valve covers did have at least a roller cam

except the one in my truck with vortec vavle covers and a 89 non-vortec engine.
100% wrong, 96 was not a transition year every 1996 model s10/blazer/jimmy/sonoma had a "true" vortec 4.3L with real vortec heads and a roller cam. Like tippmann stated, his 89 TBI is a roller motor and they have been ever since the late 80's. Every CPI motor had a roller cam and better "vortec" heads compared to the TBI heads, but they were still not the 96+ cortec heads.

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post #26 of 137 Old 04-08-2006, 01:05 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by warrenp
NO ,NO, NO

just because it looks like that does NOT make it vortec or roller cam.

96 was a transision year some where and were not well what i consider TRUE vortec
with balanced shaft roller cam and vortec heads with bolts that go straight down through the intake.

in the 90's
some of the "VORTEC'S" like pictured above said VORTEC across the mid section of the intake BUT WHERE NOT VORTEC AT ALL they just had CPI. not even a roller cam.

but also there was some pictured like the one above there had a roller cam but pre-vortec heads and no balanced shaft.

but USUALLY the ones that say vortec on the valve covers did have at least a roller cam

except the one in my truck with vortec vavle covers and a 89 non-vortec engine.
You're wrong, wrong, wrong
You don't have a clue what makes it a vortec motor. Plus, it doesn't mater what you consider a true vortec motor, has to do with what GM considers one. It has nothing to CPI, roller cams, or balance shafts. What determines if it's a vortec motor is the intake ports on the heads and nothing else. Next correction, in your long line of misinformation, All CPI motors had vortec heads and roller cams, and were consider true vortecs. All 4.3's produced after 86 were roller cam motors except for some marine applications. This means all S10 had roller cam 4.3s. Most of the rest of your claims are also false, so next time take the time to research of get some experience instead of posting a bunch of falsehoods.
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post #27 of 137 Old 04-08-2006, 05:32 PM
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Re: 4.3 Liter Vortec?

Tippmann243 if CPI are not the fastest vortecs then what is? and I have a Vortec motor(95CPI) just first gen heads, but we all can agree the second gen vortec heads 96+ flow better.
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post #28 of 137 Old 04-08-2006, 06:03 PM
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Re: 4.3 Liter Vortec?

DELETE double post

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Re: 4.3 Liter Vortec?

haha warrenp just got OWNED.....lol hehe i love my CPI even better now....



Quote:
Originally Posted by tippmann243
cpi's are not the fastest vortec, most hp rating yes, fastest no
Quote:
Originally Posted by J..D
Tippmann243 if CPI are not the fastest vortecs then what is? and I have a Vortec motor(95CPI) just first gen heads, but we all can agree the second gen vortec heads 96+ flow better.
and again he said misinformation....CPI IS the fastest motor....maybee not a top speed but it is faster than any other 4.3.......stock to stock

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post #30 of 137 Old 04-08-2006, 06:51 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by TnHombre
haha warrenp just got OWNED.....lol hehe i love my CPI even better now....





and again he said misinformation....CPI IS the fastest motor....maybee not a top speed but it is faster than any other 4.3.......stock to stock
Why not at top speed too, since all 96+ are OBD2 and shouls have had top speed limiters on them
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Re: 4.3 Liter Vortec?

i dunno....to my knowledge the CPI IS the fastest and being the highest H/P thats the only thing i can think of that he's refering to .......

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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by TnHombre
i dunno....to my knowledge the CPI IS the fastest and being the highest H/P thats the only thing i can think of that he's refering to .......
well, the CPIs did have the greater hp #s, but were not the fastest. the 96+ Vin Ws are

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post #33 of 137 Old 04-08-2006, 07:02 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by TnHombre
haha warrenp just got OWNED.....lol hehe i love my CPI even better now....





and again he said misinformation....CPI IS the fastest motor....maybee not a top speed but it is faster than any other 4.3.......stock to stock
my above post includes ''stock for stock''


try it, line up to a stock Vin w

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post #34 of 137 Old 04-08-2006, 07:06 PM
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Re: 4.3 Liter Vortec?

that is IMPOSSIBLE to do......being a high/low mileage issue.

how is it possible if a CPI has no governer, and a NON CPI has a governer?



Quote:
Originally Posted by 1fast4by
try it, line up to a stock Vin w
i AM a stock vin W

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post #35 of 137 Old 04-08-2006, 07:09 PM
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Re: 4.3 Liter Vortec?

Since CPI's have the most HP and Torque and 2nd gens weigh about the same weight, there is no reason that the 96+ W motor would be faster
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post #36 of 137 Old 04-08-2006, 07:10 PM
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Re: 4.3 Liter Vortec?

^^^ ya what he said....its like what there saying is an oxymoron.....


they jus jealous they aint got a CPI lol j/p

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Last edited by TnHombre; 04-08-2006 at 07:13 PM.
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post #37 of 137 Old 04-08-2006, 07:13 PM
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Re: 4.3 Liter Vortec?

power band, power curve, trans

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post #38 of 137 Old 04-08-2006, 07:16 PM
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Re: 4.3 Liter Vortec?

The CPI has a better power band and the both have the same tranny, so think of something else.
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post #39 of 137 Old 04-08-2006, 07:18 PM
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Re: 4.3 Liter Vortec?

yup lol....4L60E even in my 93

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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by TnHombre
they jus jealous they aint got a CPI lol j/p
when I first got my truck, (it was stock) iI ran a 2wd 5spd CPI truck, that was very well maintained (he is a GM master tech) he has 2.5'' Magnaflows, and intake...I pulled away without fault several times

Not that Im dogging on CPIs or s-10s...CPIs rock...they just arent the best

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post #41 of 137 Old 04-08-2006, 07:23 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by 1fast4by
when I first got my truck, (it was stock) iI ran a 2wd 5spd CPI truck, that was very well maintained (he is a GM master tech) he has 2.5'' Magnaflows, and intake...I pulled away without fault several times

Not that Im dogging on CPIs or s-10s...CPIs rock...they just arent the best
that dont mean anything that you beat one plenty times......there WAS a reason you beat him.....
numbers dont lie.....and im not taking you as "dogging on CPI's" nor would i care if you did........

im just tringg to find out HOW a non CPI is faster than a CPI like you said......

ALSO what year is "your" truck.....being the CPI was older than yours...theres why u won i bet.....

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Last edited by TnHombre; 04-08-2006 at 07:25 PM.
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post #42 of 137 Old 04-08-2006, 07:30 PM
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Re: 4.3 Liter Vortec?

Your crazy I test drove all different year blazers and the 95 was clearly quicker than the 98,99,and 2001 I test drove. The 96+ 4.3 is a good motor but did not have the low end or passing gear the CPI had. The CPI's do have a governor I went to 105 when mine kicked in, my friends 2000 blazer goes to 96.
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by TnHombre
that dont mean anything that you beat one plenty times......there WAS a reason you beat him.....
numbers dont lie.....and im not taking you as "dogging on CPI's" nor would i care if you did........

im just tringg to find out HOW a non CPI is faster than a CPI like you said......

ALSO what year is "your" truck.....being the CPI was older than yours...theres why u won i bet.....
98 Vin W 4x4

His had 3k more miles on the clock than mine at the time

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post #44 of 137 Old 04-08-2006, 07:47 PM
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Re: 4.3 Liter Vortec?

94's did have the value in the ECM for the top speed govenor set and I've seen 95's that didn't, but that doesn't mean they all didn't. A lot of times the replacement or upgrade eproms had them set, even if it was't done at the factory.

Rear end gears wouyld have a big effect on acceloration, so that could have been the differance or maybe his inabilty to shift within the best area of the power band

What year CPI 5speed? I tried buying one for last 6 months in the 93 model and they kept telling that they were not avaiable, When the 94's came out, I was told the same story so I ended up buying something else and to this day I have yet to see one, even though, they have to exsist since GM lists an Eprom for that combination
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post #45 of 137 Old 04-08-2006, 08:26 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by poconojoe
Since CPI's have the most HP and Torque and 2nd gens weigh about the same weight, there is no reason that the 96+ W motor would be faster
i could be wrong but doesnt the 96 and newew motor make peak torque lower then the cpi motor? or am i thinking of the tbi motor, i cant find my notes on the curves
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by tippmann243
i could be wrong but doesnt the 96 and newew motor make peak torque lower then the cpi motor? or am i thinking of the tbi motor, i cant find my notes on the curves
I tried to quickly find some charts but couldn't. But, no the CPI motor had the same advantage of the TPI motors of getting more torque at lower RPM's and the open plenium advantage when the tuning valve opened. The gave the motor a low starting and longer lasting torque curve. It was a great design, too bad the stuck such a crappy injector system in it . Both the CPI and the later CSFI motors had better torque curves than the TBI ones
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post #47 of 137 Old 04-08-2006, 11:22 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by tippmann243
the 7th vin tells you the body type and the only numbers that are available are 3,4,6,8,9 so the 7th vin has nothing to do with motors you want the 8th vin like i said earlier
i just wanted to see if anyone would actually go out and look i didnt know what number it was

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post #48 of 137 Old 04-09-2006, 12:56 AM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by poconojoe
I tried to quickly find some charts but couldn't. But, no the CPI motor had the same advantage of the TPI motors of getting more torque at lower RPM's and the open plenium advantage when the tuning valve opened. The gave the motor a low starting and longer lasting torque curve. It was a great design, too bad the stuck such a crappy injector system in it . Both the CPI and the later CSFI motors had better torque curves than the TBI ones
i had a chart on my old computer and i cant find it, i must be thinking of something else though. damn now its gonna bother me that i cant find that chart
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post #49 of 137 Old 04-09-2006, 05:51 PM
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Re: 4.3 Liter Vortec?

Quote:
Originally Posted by tippmann243
the 7th vin tells you the body type and the only numbers that are available are 3,4,6,8,9 so the 7th vin has nothing to do with motors you want the 8th vin like i said earlier



so much misinformation

cpi motors arent technically a vortec motor but they ALL came with a balanced shaft and all had roller cams, my 89 tbi motor im rebuilding has a roller cam

the cpi motors also came with heads that flow WAY better then tbi heads

all in all the "vortec" name is just so the salesman can point and say hey look its got a vortec motor that means its got power
nope!
i take engine apart all the time i work at the local junk yard.
i have taken CPI intaks off of older blazers and seen NO roller cam!!!

the last one i saw a was a 93 blazer had CPI steel vavle covers and NO Roller cam! it has solid lifters!!!

now this i'm not 100% sure of where is the balanced shaft?
is this the part located ablove the cam?

if so then definetly not all vortecs had a balanced shaft!!!

all my information is from experiance NOT FROM A BOOK!
just becasue it's a 96 also does not mean it had bolts that go straight down on the intake.

to me a true vortec has balanced shaft, roller cam and had with the bolts that go straight down.

2000, s10 4x4 4.3 auto...
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post #50 of 137 Old 04-09-2006, 06:48 PM
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Re: 4.3 Liter Vortec?

i have a 94 s10 with the 4.3L TBI vortec ...if you look by the fire wall it will say vortec on the valve cover and look at the vin #
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