4.3 Chevy v6 builds. - Chevelle Tech
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post #1 of 39 (permalink) Old Aug 1st, 18, 3:47 AM Thread Starter
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4.3 Chevy v6 builds.

I'm looking into getting a LV3 4.3 v6 to put in my chevelle. from the research I've done it seems like a perfect combination of reliability, higher mpg, and with a couple turbos, plenty of power. it's an aluminum block and heads so lightweight too. just wondering if anyone on here has ran a chevelle with any of the 4.3 v6s?

they've been around since the 70s. I've got an 86 Chevy g10 van with one and it runs great and sounds good.
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post #2 of 39 (permalink) Old Aug 1st, 18, 3:57 AM Thread Starter
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post #3 of 39 (permalink) Old Aug 1st, 18, 6:27 AM
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Re: 4.3 Chevy v6 builds.

Are you sure it has an aluminum block and heads? I looked up the LV3 and it shows cast iron for both, along with a cast crank and connecting rods.

I have a friend that uses a 4.3 liter V6 in an early Nova wagon. He uses it for bracket racing, but said he would have gone with a 305 Chevy if he were to do it again.

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Last edited by Steve R; Aug 1st, 18 at 6:32 AM. Reason: Rtdgfdgfdffdfddfdfdc
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post #4 of 39 (permalink) Old Aug 1st, 18, 7:21 AM
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Re: 4.3 Chevy v6 builds.

They don't make the power you'd think they do. They're nothing more than a 350 with the back 2 cylinders gone. There are a few cams available. Mileage isn't much different from a V8.

I'd look into a 3.8L (3800) if you're looking to play with a 6-banger. They're "baby LS" engines with deep skirted crossbolted mains and symmetrical ports and respond well to boost. They use a transmission with a screwey bolt pattern but there are plenty available.

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post #5 of 39 (permalink) Old Aug 1st, 18, 7:31 AM Thread Starter
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Cylinder block: the all-new Gen V cylinder block shares two key design elements with GM’s original small-block V8: a 90-degree cylinder angle and 4.400-inch bore centers. The bore and stroke dimensions are 3.92-inch (99.6 mm) bore x 3.62-inch (92 mm) stroke (262 cubic inches) for the 4.3L. Compared to the Gen IV engine, the Gen V’s aluminum cylinder block casting is all-new, but based on the same basic architecture. It was refined and modified to accommodate the mounting of the engine-driven fuel pump and vacuum pump. It also incorporates new engine mount attachments, new knock sensor locations, improved sealing and oil-spray piston cooling.

Read more:*http://gmauthority.com/blog/gm/gm-en...#ixzz5MvQCnMul
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post #6 of 39 (permalink) Old Aug 1st, 18, 7:35 AM Thread Starter
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the van I have is an 86 with a computer controlled quadjet, my stepdad had it rebuilt about 30k miles ago. it runs awesome and I get 20mpg on the freeway 15ish in town. the gen v lv3 also had active fuel management so it cuts to 4 cyl under low load conditions, prefect for what I want since I will be doing some cross country driving. turn the boost down and cruise....
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post #7 of 39 (permalink) Old Aug 1st, 18, 8:13 AM
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Re: 4.3 Chevy v6 builds.

The 4.3 V6 is actually a 305 with 2 missing cylinders, so you can find tips the 305 guys on how to make power. I've seen the 4.3 make some very good HP numbers (about 350 hp and 350 t) but the amount of work put into them was crazy, unless you own your own machine shop you are going to spend a lot of money, and while i'd admit it would be really cool to have a turbo 4.3 in a car it would kind of suck to get passed by a junk yard LS which will make more power for a lot less money.

.
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post #8 of 39 (permalink) Old Aug 1st, 18, 8:22 AM
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Re: 4.3 Chevy v6 builds.

Quote:
Originally Posted by sampoerna415 View Post
The 4.3 V6 is actually a 305 with 2 missing cylinders, so you can find tips the 305 guys on how to make power. I've seen the 4.3 make some very good HP numbers (about 350 hp and 350 t) but the amount of work put into them was crazy, unless you own your own machine shop you are going to spend a lot of money, and while i'd admit it would be really cool to have a turbo 4.3 in a car it would kind of suck to get passed by a junk yard LS which will make more power for a lot less money.
Wrong.

Do the math.

350/8 (8 cylinders) = 43.75 cubic inches per cylinder
43.75X6 (6 cylinders) = 262.5 cubic inches total OR 4.3L displacement (you can look at bore and stroke too, but this is a better illustration)

Technically a 4.3 is the same as a 350 w/ 2 middle cylinders cut out, it doesn't have the siamesed exhaust port that the 350 does.

I've been interested in the LV3 as well, all LS technology. Only thing I'd be worried about is the direct injection and tuning, haven't gotten into that yet. Have a 00 ZR2 with a tired 4.3, curious as to how hard the swap would be to the newer setup.

*Jeff*

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post #9 of 39 (permalink) Old Aug 1st, 18, 10:30 AM Thread Starter
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I was a tech, now I'm a boat mechanic(bering sea fishing boats) so ill do all the work myself. it's just cost of parts for me....

as far as tuning and software goes, Nelson race engines out of the la area have all the computers and software you'll ever need. they're the guys that built that engine from the video, they build all kinds of crazy turbo engines, have all the performance parts and electronics to goo with them.
I'm young with no kids and a good bit of disposable income. I don't see any reason why I won't be able to build a 1000+hp 4.3 for under 10k in less than 2 years. I was originally going to take a 50s era 235 inline 6 and put fuel injection and twin turbos, an old school meets new school kinda thing, but after some research these newer 4.3 are looking like a much more affordable easier to build option.
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post #10 of 39 (permalink) Old Aug 1st, 18, 10:36 AM Thread Starter
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everyone has seen a thousand big blocks supped up and even more 350s/ls's I don't want some run of the mill cookie cutter chevelle. I'm really building her more for a drifting vehicle than a drag car, independent rear suspension, coil over front the works. a light weight high power v6 is right up that alley. Now don't fret, there are no low profiles or a lowering kit anywhere in my cars future.

im half tempted to take the 454 that's in my 68 build it all up and make the ultimate sleeper out of my van.
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post #11 of 39 (permalink) Old Aug 1st, 18, 10:45 AM Thread Starter
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Quote:
Originally Posted by Busted Knuckles View Post
They don't make the power you'd think they do. They're nothing more than a 350 with the back 2 cylinders gone. There are a few cams available. Mileage isn't much different from a V8.

I'd look into a 3.8L (3800) if you're looking to play with a 6-banger. They're "baby LS" engines with deep skirted crossbolted mains and symmetrical ports and respond well to boost. They use a transmission with a screwey bolt pattern but there are plenty available.
is this the same as the transverse mounted 3.8 Pontiac and Buick used, plastic upper intake? I did a lot of swaps on these, the upper intake would leak coolant into the oil causing massive rod and main bearing failure....
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post #12 of 39 (permalink) Old Aug 1st, 18, 10:58 AM
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Re: 4.3 Chevy v6 builds.

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Originally Posted by BlakeSixty8 View Post
I don't see any reason why I won't be able to build a 1000+hp 4.3 for under 10k in less than 2 years.
Fast. Cheap. Reliable. Pick any two.
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post #13 of 39 (permalink) Old Aug 1st, 18, 11:33 AM
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Re: 4.3 Chevy v6 builds.

4.3's were cast iron, both block and heads. I had one in a 98 S10 ZR2. Loved that engine!!!!
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post #14 of 39 (permalink) Old Aug 1st, 18, 1:37 PM
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Re: 4.3 Chevy v6 builds.

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Originally Posted by Hotwire View Post
Wrong.

Do the math.

350/8 (8 cylinders) = 43.75 cubic inches per cylinder
43.75X6 (6 cylinders) = 262.5 cubic inches total OR 4.3L displacement (you can look at bore and stroke too, but this is a better illustration)

Technically a 4.3 is the same as a 350 w/ 2 middle cylinders cut out, it doesn't have the siamesed exhaust port that the 350 does.

I've been interested in the LV3 as well, all LS technology. Only thing I'd be worried about is the direct injection and tuning, haven't gotten into that yet. Have a 00 ZR2 with a tired 4.3, curious as to how hard the swap would be to the newer setup.
Yep, I was thinking of the 3.8 for some reason. The 3.8 was based off the 305.

.
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post #15 of 39 (permalink) Old Aug 1st, 18, 1:55 PM
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Re: 4.3 Chevy v6 builds.

Most people associate 3.8s as 60 degree engines. There was a 3.8 90 degree engine but that would be an even more outlandish idea than a 4.3.

There's no reason to reinvent the wheel. The reason people don't use 4.3s is because it doesn't make sense. It will cost multiple times to make the same power as a junkyard LS and won't have the reliability.

Don't let us stop you, it's your stuff, but if you think 1,000 horsepower out of a 4.3 is possible for under $10,000 you're fooling yourself. Let alone making it stay together for more than a pull or two on a dyno.

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