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modded 4.3 vs v8

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Old 09-07-2011, 01:40 PM   #1
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modded 4.3 vs v8

Okay so I've been thinking of small blocking my blazer but before I drop the hammer on it I was thinking I have a 4.3 out of my 95 noma 4x4 and it ran when pulled (got a killer deal on a new one less then 3000 on it ) any way I was just curios to see would I be better off building a 4.3 a little or dropping in a small block any thought, concerns,comments ,tips they are all greatly appreciated thanks o this is going in my four wheel drive blazer and its my dd
Old 09-08-2011, 12:08 PM   #2
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Re: modded 4.3 vs v8

Any suggestions? Its a 95 so it has the balance shaft is that good or bad for building? Can I use my 2.8 ecu or not I a newb so maybe a push in the right direction would be awesome
Old 09-08-2011, 01:02 PM   #3
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Re: modded 4.3 vs v8

If you are asking which swap would be cheaper, the 4.3 would be your best move. If you want the best performance and kick in the ass fun, you can't beat the V8. IMO, (if it was I) the LSX would be my choice. Ultimately better gas milage, better performance, lower emissions, and probably even longer life. Just sayin'
Old 09-08-2011, 01:20 PM   #4
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Re: modded 4.3 vs v8

The guys with the most bad ass of v6's on here, im talking about retarded built boosted badasses are pushing very mild small block/ls numbers. If you wanna go fast you'll spend less with an 8 in the long run.
Old 09-08-2011, 01:55 PM   #5
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Re: modded 4.3 vs v8

Okay I was just curius abot it
Old 09-08-2011, 01:59 PM   #6
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Re: modded 4.3 vs v8

Yeah but I have the 4.3 already so I might just stay that route
Old 09-08-2011, 04:02 PM   #7
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Re: modded 4.3 vs v8

it depends on your budget.

Some on here have well over $5,000 in there 4.3 and are barely at 300 hp at the rear wheels. these are cammed, bored, modied heads, intakes, injectors, ecu's, etc.

IMO a V8 is cheaper to make the HP you want.

But the question to you is, how will this vehicle be used. Will it be an offroad vehicle or a street vehicle?
Old 09-08-2011, 04:53 PM   #8
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Re: modded 4.3 vs v8

Yeah the fuel systems are shit they are only good to like 260hp or something then you have to buy that 80 pound cast iron marine intake to put bigger injectors start fooling around with several hundred dollar computer tunes and rewiring then you have to boost or juice to get anything past 300... Like he said people spending 5000 for 300 hp from a v6. Or you could just buy a 600 dollar LM7 from the junkyard and get 300hp without doing anything.

Also on a side note I liked my old 87 2.8 better than my 2000 4.3. Better gas mileage, less problems, cheaper parts, not a whole lot slower either really...

Good luck!
Old 09-08-2011, 06:03 PM   #9
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Re: modded 4.3 vs v8

To make any argument we need more info, budget and use would be the first. I think that a V8 is way easier to get the HP numbers out of, but if you are only in need of 250 HP the 4.3 is absolutly fine for you. if you put a 75 shot of nos on the motor you would be there and wouldnt really have much money stuck into. I think it would be sweet to have a built 4.3. But we need more info first.
Old 09-08-2011, 06:11 PM   #10
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Re: modded 4.3 vs v8

Just my 2 pennys:

Anybody can swap a v8 but not many build a bad ass V6. I vote for a killer v6 just from the coolness factor.
Old 09-08-2011, 08:28 PM   #11
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Re: modded 4.3 vs v8

Old farts sayin' "There is no replacement for displacement" Still
holds true as far as saving dough.
Old 09-08-2011, 09:09 PM   #12
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Re: modded 4.3 vs v8

Okay I plan on dd it. Also itl be an offroad toy and ocasiannly be off roaded and I want to get by kinda cheap so I plan on using 97 vortec heads and maybe carbing it for cheapness also headers will be in the mix and I agree a killer v6 would be rowdy that's why I am throwing the option around keep the comments and ideas coming
Old 09-08-2011, 09:13 PM   #13
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Re: modded 4.3 vs v8

Cam
Intake
Valve Springs
Exhaust (headers)
Computer tuning
Vortec Heads (optional if you dont have them)
should get you in the 250-275 range and still be very drivable and maintainable on a V6
Old 09-08-2011, 09:27 PM   #14
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Re: modded 4.3 vs v8

add electric fan to that list and regear depending on what you have currently
Old 09-08-2011, 09:28 PM   #15
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Re: modded 4.3 vs v8

as far as off roading goes im not to up to date on the 4X4 S10 I have a Jeep and a lot of people swap the transfer case out for a higher ratio one.
Old 09-08-2011, 09:42 PM   #16
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Re: modded 4.3 vs v8

Yes you can build a good DD 4.3L with some power. Granted it's not gonna be some killer but will definitely hold its own. Drop in a nice set of flat tops with a good custom cam. Have the heads setup for the cam while there in the machine shop. And setup the fuel how ever your gonna do it. My original motor was bone stock bottom end swinging 2 valve relief SRPs with a good custom grind cam ran 13 flat all motor all day On 100 octane pump gas and 93 on the street. Thats before going nuts and building what I have now.
Old 09-09-2011, 12:17 AM   #17
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Re: modded 4.3 vs v8

Hell yeah that's the kinda stuff I wanna hear lol keep it coming yeah I'm not a super speed freak (at the moment lol) I'm into four wheeling and I got the 4.3 outa my 95 like mentioned in my earlier post and I'm not look en to build an insane motor I just want something I can hold my own with

What type of cam,spring,valves,intake do you recommend I'll be look en for low end torque for wheeling purposes so let me know keep it comen lol
Old 09-09-2011, 03:43 AM   #18
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Re: modded 4.3 vs v8

I went thru the same dilemma...V6 or V8. In the end, I decided to built a slightly hopped up 4.3L Vin Z (no balance shaft). The block was bored .020" and has flat topped pistons, a marine cam with lift around .410", a set of '96 Vortec heads, aftermarket roller rockers, an Edelbrock 2114 with adapter, running a TBI. My main thoughts for siding with the 4.3L were I didn't want to mess too much with the electronics/computers nor shoehorning a V8 into the engine compartment. On top of that, handling would be a concern with too much weight and power in the front and a light back end. Lastly, while I'd worked on many V8's, I'd never reworked a V6 before so that represented a challenge. I have NOT yet dropped it into my DD '92 4x4...but it will be soon.

So, at this point, I've dropped $3000+ on a motor that I know will be hard pressed to make 1 hp per cubic inch. In hindsight, maybe a bone stock 305 with TBI may have been a better AND cheaper option.

As others have suggested...budget and goals are key to whatever you decide to do.
Old 09-09-2011, 10:02 AM   #19
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Re: modded 4.3 vs v8

Yeah I thought about carbing mine to make it a little simpler also most of my parts will be used and what not

Quick what other parts do you recommend and were is the best place to get parts for the 4.3

And I'm pretty sure I read earlier that you can use the actually vortec heads on a non vortech block correct?

Keep the info rollin lol
Old 09-09-2011, 09:00 PM   #20
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Re: modded 4.3 vs v8

Most parts can be had from summit and jegs.Pistons come from a 350 SBC with a 3.48 lift and 5.7 rod.All heads fit all year blocks. Cam call comp direct for cam and springs for cam or least spring part number.
Old 09-09-2011, 09:06 PM   #21
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Re: modded 4.3 vs v8

/\ can you link your build thread for the nasty motor.
Old 09-09-2011, 09:51 PM   #22
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Re: modded 4.3 vs v8

http://www.cardomain.com/ride/259609...10-regular-cab
Old 09-10-2011, 12:32 AM   #23
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Re: modded 4.3 vs v8

That shit is ****ing sick sir. I salute and applaud you. A true detriment to V8 swaps everywhere lol.
Old 09-10-2011, 02:46 PM   #24
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Re: modded 4.3 vs v8

Yeah I agree that thing is sick!
Okay so I can use 350 pistons (flat tops) what about rods can I use the small block ones as well?

So I plan on doing the following
Heads(vortec)
E-fan
Under drive pullies
Headers
High flow exhaust
Bore it 30 over
And a cam of some kind what kinda power am I looking at outa that stuff?
Old 09-10-2011, 10:09 PM   #25
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Re: modded 4.3 vs v8

I would guess 200-230 at the crank. 180 ish to the wheels or something just a guess. Syclones were pretty tricked out and on inter-cooled boost and they were only 280 at the crank. Torque is probably the number you wanna look at anyway stock vortec 4.3s have like 250 ft lbs.
Old 09-10-2011, 10:31 PM   #26
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Re: modded 4.3 vs v8

No you have to use stock or buy a set of eagles or oliver for the 4.3L. 350 uses a wider rod.
Old 09-11-2011, 07:06 PM   #27
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Re: modded 4.3 vs v8

ill chime in with my 2 cents also. i am now tearing my s10 down for a v8 but from what you are saying you might be ok with the mods i had on mine. 1.jba headers 2 granatelli mass air flow sensor with matching cold air intake 3. poweraid throttle body spacer with just those three mods my lil s10 would skat! only reason im upgrading is the spider injector went and im not spending 500 bucks on the injector when i was just about ready to pull the trigger on the v8.. and another thing, im spending about 4500 on the v8 conversion and thats a budget build
Old 09-11-2011, 11:55 PM   #28
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Re: modded 4.3 vs v8

The mass air sensor and throttle body spacer are on the top ten list of worthless mods in the forums performance section sticky lol.

They sell the ACdelco not japanese brand upgraded injector kit the whole thing not just the spider brand new for 200 bucks on ebay.

Also a budget build, you can buy a L31 vortec 350 from the junkyard for 500 bucks section the core support and put junkyard intrepid fans in there reuse your computer, wiring, spider harness will plug right into it, everything else and get the computer re-tuned for 100 bucks. 1000 dollar swap right there if you add some extras like exhaust and shit.
Old 09-12-2011, 01:39 AM   #29
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Re: modded 4.3 vs v8

Quote: Originally Posted by rhygin
The mass air sensor and throttle body spacer are on the top ten list of worthless mods in the forums performance section sticky lol.

They sell the ACdelco not japanese brand upgraded injector kit the whole thing not just the spider brand new for 200 bucks on ebay.

Also a budget build, you can buy a L31 vortec 350 from the junkyard for 500 bucks section the core support and put junkyard intrepid fans in there reuse your computer, wiring, spider harness will plug right into it, everything else and get the computer re-tuned for 100 bucks. 1000 dollar swap right there if you add some extras like exhaust and shit.


Those gen vortec 5.7s have poppets just like the 96+ vortec 4.3s do. Both are CSFI. They just have 8 of them. So you'll be in the same situation. There are after market MPI intake out there for the v8 vortecs but they're are not cheap. So add another $1000-2000 to that swap if you want to make power with that 5.7.


L31 vortec (genII) doesn't have the hp/tq number to be worth the work IMO (255h/330tq). It's heavier then a 4.3 and still limited by the same POS fuel system. I say go genIII v8 or don't bother. This is assuming that you're going to stay EFI and computer controlled of course.

You said in an earlier post that it would costs hundreds of dollars to tune the 4.3. But only $100 to tune a s10 with a L31 Vortec? They share the same PCM. There would be no price difference. The 4.3 marine intake is about 50 pounds. Maybe the V8 version might be 80lbs. 4.3 marine intake can be bought for about $200 new with injectors. The v8 vortec marine intakes run quite a bit more then that.


What year Blazer does the OP have anyways? I didn't see it mentioned. I think that matters if a engine swap is being considered.

Example, a LS1 swap into a 2001 s10 would be cheaper then one going into a 85 s10.

There is always more to it. That's why it's so important to do plenty of research before spending a dime on anything.

If I were to have a 1st gen s10 and wanted a v8 then a L31 Vortech 5.7 out of 96-98 (97?) pick up would be the way I'd go. I'd get a intake, carb, stick a cam in it and enjoy.
Old 09-12-2011, 02:21 AM   #30
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Re: modded 4.3 vs v8

The computer just needs to be flashed to a full size the post about the 4.3 was for hp tuners shit. He wasn't talking about boost either Im pretty sure hes looking for about 300hp and that L31 would give it to him in the cheapest manner possible I think... Gen 3's are awesome but a 800 dollar harness and a 200 dollar tune later that sucks plus special oil pans etc... its alot harder.
Old 09-12-2011, 02:41 AM   #31
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Re: modded 4.3 vs v8

The L31 doesn't have 300 hp. If he wants 300 hp out of it he is going to have to do something to it. That will require more fuel because the POS popets that are on the l31 vortecs are 19lb/hr just like the 4.3s. 19lb/hr injectors are going to be maxed out at 300hp. It is still going to need to be tuned.

If his does get 300 hp out of it with a cam or something then wants more then what? Time to swap intakes. That's not going to be cheap.

Sure a wiring harness to run a genIII and an oil pan might be $1000. You won't have to get a different intake though and there are injectors companies that will make the injector flow more fuel for about $25 each. You're also going to be starting out with more hp with the genIII and the engine is lighter since they have aluminum heads.
Old 09-12-2011, 11:33 AM   #32
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Re: modded 4.3 vs v8

I agree with you a hundred percent the gen 3's are awesome motors. In no way was I saying an L31 was a better engine its just the cheapest. If you are looking into the future and want to see 10 second times the LS motor is the only way to go, but for a reliable 4x4 mud running s10 I see nothing wrong with an L31 for a 1/3 of the price. Wynjammer sells the 36 pound spider injector now too you know that, its still more limited than the other options.
Old 09-12-2011, 04:36 PM   #33
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Re: modded 4.3 vs v8

The l31 is fine. I'm just saying ,it depends on what it's going into and whether you plan on keeping it EFI. What trans is going to be used matters too.


I just went back through the thread and still didn't see where the OP mentioned what year truck he had. But I did see he had a 2.8. So that tells me it's a first gen and doesn't have a vortec PCM.

He has a 95 CPI 4.3 he's thinking of putting in. I think that will be way more work then what it's worth. But if he has the harness and the PCM then he won't need the PCM flash. Well unless the 95's transmission is a 4l60e and he's not going to use it too. If the 95 PCM did control the trans and he doesn't plan on using if he will have to turn off all the codes he'll get.

There's always so much more to it then just get an engine and drop it in. Especially when it comes to EFI.

If the Op has a 1stgen that doesn't have a PCM controlled trans, then a L31 with a aftermarket intake and carb would probably be best. But then you got to think about what trans he is going to use. IDK if the trans that was behind his 2.8 with bolt up to the 5.7.
Old 09-12-2011, 06:10 PM   #34
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Re: modded 4.3 vs v8

Is Ur 4.3 a balance shaft motor? Since its a 95 i assume it is. If u plan on sticking to the 4.3 go with comps 260AHR cam. It'll have great low end and mid range. also mileage wont suck. I plan to use the same cam but ground a lil different than what they have.
Old 09-12-2011, 06:53 PM   #35
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Re: modded 4.3 vs v8

Wow guys that's awesome I've been busy but here's what I want to do

Carb 4.3 swap make it easier (lol)
I plan on running the truck avenger series carb
Also I think comp cams makes an extreme 4x4 cam for it (low end specific)
Also I've thought about the v8 swap and decided against it cause I have the 4.3 already
And my blazer is an 89

Keep the stuff comen

O I also am planing on using swirl polished valves and stiffer spring and some roller rockers
Old 09-12-2011, 08:21 PM   #36
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Re: modded 4.3 vs v8

Def do the springs and rockers! Don't wana run a nice new cam and then have a spring collapse. It's no fun.
Old 09-12-2011, 10:16 PM   #37
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Re: modded 4.3 vs v8

Yeah that would suck.

Yeah I'm not looken to build a monster motor ( nothing like 300 )
Id be happy witht the 250,270 ish range I'm sure it can be done with the mods I have planned all it takes is mone lol
Old 09-13-2011, 12:04 AM   #38
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Re: modded 4.3 vs v8

It all takes money lol. But with a low end cam you'll see some really good power down low. Just make sure your gearing and tire height match what you build. It makes a difference make a build thread when u start everything. I wana keep up and see what ya come up with.
Old 09-13-2011, 12:56 AM   #39
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Re: modded 4.3 vs v8

O itl be different lol but I'm gonna stick to a moderate straight forward build cause money is tight these days so I'm gonna stick to a tight budget.
I'm not going to try to build a monster motor cause frankly I ain't got the money for it lol

And I will definitely start a build thread when it goes down
Old 09-13-2011, 02:11 AM   #40
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Re: modded 4.3 vs v8

Quote: Originally Posted by 12sws27
IDK if the trans that was behind his 2.8 with bolt up to the 5.7.

No it wont. I wouldn't wanna see what would happen if it did lol.
Old 09-13-2011, 06:18 PM   #41
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Re: modded 4.3 vs v8

Quote: Originally Posted by rhygin
No it wont. I wouldn't wanna see what would happen if it did lol.
Ah ha! Something else to think about. Well if it won't bolt up to a V8 then it shouldn't be able to bolt to the 4.3 then huh?
Old 09-13-2011, 08:00 PM   #42
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Re: modded 4.3 vs v8

Nope 60 degree trannys wont bolt to a 90 degree they are completely different.
Old 09-14-2011, 12:26 PM   #43
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Re: modded 4.3 vs v8

Yep that why I already got a 90' tranny from behind a 4.3 sitten in my shed lol I got it cheap and its been rebuilt but I'll look at it before it gets put in to make sure.

Has any body heard of a company called Campbell performance? I was on there website and found some killer looking h beam style rods for like. 570? Ish I think I was just curios if any body heard of them they were called k1 rods I believe
Old 09-14-2011, 12:54 PM   #44
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Re: modded 4.3 vs v8

What intake would be the best when doing a carb swap?
I hear the marine one is a beat but will it work with a carb?
I would like a intake that makes good low and mid range power

Thanks
Old 09-14-2011, 01:16 PM   #45
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Re: modded 4.3 vs v8

I dont think you have to many options someone makes a sheetmetal one that is ridiculous expensive, edlebrock makes a regular like performer and I seen some wild ass looking thing on disturbing v6's dont know what it is lol.

This is the marine its really only for used for FI apps where the spider cant keep up anymore, its heavy and has a three bolt TB flange.

http://cgi.ebay.com/ebaymotors/4-3L-...item20bc392c48
Old 09-14-2011, 01:59 PM   #46
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Re: modded 4.3 vs v8

Quote: Originally Posted by project blazer
Yep that why I already got a 90' tranny from behind a 4.3 sitten in my shed lol I got it cheap and its been rebuilt but I'll look at it before it gets put in to make sure.

Has any body heard of a company called Campbell performance? I was on there website and found some killer looking h beam style rods for like. 570? Ish I think I was just curios if any body heard of them they were called k1 rods I believe
For the naturally aspirated mild build you are describing I don't see any need for new rods, stock should be just fine.
Old 09-14-2011, 03:46 PM   #47
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Re: modded 4.3 vs v8

Whoa mintsick I heard you used to have a rowdy 4.3 any other advice?
Old 09-14-2011, 08:31 PM   #48
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Re: modded 4.3 vs v8

Edelbrock 2114.

What transmission is it you have?
Old 09-14-2011, 10:13 PM   #49
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Re: modded 4.3 vs v8

**** this is funny lol...

Quote: Originally Posted by cttandy If you want to compare intelligence, you will loose and loose badly.
Old 09-14-2011, 11:16 PM   #50
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Re: modded 4.3 vs v8

U mirin son?
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