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#1007438 - 07/13/14 07:31 PM 4.3 build  
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mike0806 Offline
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waldoboro me
Hey guys. I know ill probably get some haters on this one but i dont care. I am goin to rebuild the 4.3 in my monte and either turbo or supercharge it. I know its not a ls or 350 but its different and thats what im about when it comes to stuff like this. I was just curious if anybody could give me some pointers and or links that anyone can share. The inspiration for all this is the buick grand national

#1007444 - 07/13/14 08:57 PM Re: 4.3 build [Re: mike0806]  
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88ss408 Offline
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I had seen a article once in a magazine where they had stroked the 262 v6 in to a 283 v6. Same principal as the v8 strokers. They installed a 3.75 crank instead of the stock 3.48.


1988 monte carlo ss 408 sbc
-----------------------------------------------------
1984 monte carlo cs 400 sbc
#1007445 - 07/13/14 09:10 PM Re: 4.3 build [Re: mike0806]  
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pazzo1969 Online thinking
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Mableton, GA
Biggest question i have is budget? Click on link below to my photobucket. Should come up with engine pics. Pazz
http://s213.photobucket.com/user/pazzo1969/library/engne%20stuff?sort=2

Last edited by pazzo1969; 07/13/14 09:20 PM.

President Wicked Rides/Wicked Montes Georgia chapter
#1007446 - 07/13/14 09:20 PM Re: 4.3 build [Re: pazzo1969]  
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clean8485 Offline
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Lindsay, Ontario
Carbureted or fuel injected? Is there a target as far as horsepower is concerned? If you're looking for an example of a turboed 4.3, you could look at the engine that GM used in the Cyclone and Typhoon trucks.

#1007482 - 07/14/14 09:46 AM Re: 4.3 build [Re: mike0806]  
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mike0806 Offline
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waldoboro me
I havent came up with a budget yet and i was shooting for 450hp. I can go either way but id like to keep it fuel injected

#1007494 - 07/14/14 12:50 PM Re: 4.3 build [Re: pazzo1969]  
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MecGen Offline
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No hate for the 4.3 liter, its basically a SBC with two cylinders missing

Originally Posted By: pazzo1969
Biggest question i have is budget?


Quoted for the truth. I did some research into modifying a 4.3 a few years back and it was all about parts availability = price. You need to have a planned budget and do homework ahead of time. 450 HP is expensive territory for the 4.3

Good luck


Space may be the final frontier
but its made in a Hollywood basement.
RedHotChilliPeppers.

1987 MCSS.- Sold
1984 MCSS.- Sold
1984 MCSS - came back smile
1995 Mustang 5.0
1965 Pontiac GTO
1969 Pontiac Firebird
#1007504 - 07/14/14 02:38 PM Re: 4.3 build [Re: mike0806]  
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mike0806 Offline
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waldoboro me
Thanks for the information guys. Keep it comin!!! Im surprised that no one has called me crazy yet...lol

#1007549 - 07/14/14 10:36 PM Re: 4.3 build [Re: mike0806]  
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pazzo1969 Online thinking
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Mableton, GA
If wanting to stay injected, i would suggest starting your research on a typhoon/syclone site. Be prepared for some pricey parts. Carbed has it's own fun things to consider. I have spent many years building and trashing the 4.3. Please feel free to ask any ?'s you might have regarding the carb setup. Pazz


President Wicked Rides/Wicked Montes Georgia chapter
#1007564 - 07/15/14 12:43 AM Re: 4.3 build [Re: mike0806]  
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mike0806 Offline
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waldoboro me
I know if i went carb it would be easier but what are the other pros to goin carb? Could you give me some pros and cons on both?

#1007576 - 07/15/14 04:14 AM Re: 4.3 build [Re: mike0806]  
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joyride Offline
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Tacoma, Wa
I had a 4.3l built for my s10 xtreme. I was super excited with it being my first build and all. I'm not gonna lie I did enjoy driving it but after the money I spent I honestly wished I built a v8. The stroker crank for the 4.3l is pretty pricey too. I have a friend from the s10forum.com that runs an extremely pricey 4.3l, stroker crank, an insanely big xxxx cam, and i think some brodix heads which for the 4.3l you're gonna have a harddddd time finding them and if you do you're gonna pay too of course. He's running a ton of nitrous in it too and running 10s but he has a xxxx ton of money into it. On the forum his name is disturbingv6 or maybe it's his youtube page's username too.

I think personally something more fun to build would be a 302 dz motor, or a 392 stroker motor to run some high rpms! haha


Brian

Had an 88 Monte SS in HS, sold that!
07' MC SS black, all stock (for now)
85' Monte SS project car. Flat Black, 305 w/ LT headers, drop spindles, CPP 2 inch A-body rear springs, 18" Boss 338s
http://www.youtube.com/watch?v=HeKFlFEG_Bk&feature=share&list=UUiPzUj6CEffDt2J4Rv0Iwfw
#1007580 - 07/15/14 09:57 AM Re: 4.3 build [Re: mike0806]  
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BuzzLOL Offline
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.
. Get the ThrottleBody off a 350" engine, the injectors off a 454 TBI, two turbochargers off some turbo 4-bangers, boost adjusted fuel pressure regulator, put KB hypereutectic dished pistons and a mild cam in the 4.3L V6, and adapt the stuff in this article to do the rest:

. Build a 1,000 HP TwinTurbo SBC 350 for $1,000 (warning! picture is exciting):

http://www.carcraft.com/techarticles/ccrp_1009_cheap_turbos_from_ebay_on_a_350_small_block_engine
.


'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O
#1007642 - 07/16/14 12:38 AM Re: 4.3 build [Re: mike0806]  
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mike0806 Offline
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waldoboro me
Sounds like this could get REALLY expensive

#1007667 - 07/16/14 04:02 AM Re: 4.3 build [Re: mike0806]  
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joyride Offline
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Tacoma, Wa
https://www.youtube.com/watch?v=fnreD9aTRYY
http://youtu.be/pE-PhX5R8zw

I don't know what all his setup is but apparently its stroked out to be a 309 v6, which is pretty cool if you ask me but doing something different like that, costs $$$.

It's actually what I was going for with my 4.3l build. I thought it'd be cool to be different instead of just dropping a v8 in it but for the same price i spent on that v6 i could've made a ton more power and had a lot more fun with it going with a v8. I think my motor and all the machine work, porting and polishing the vortec heads, 3 angle valve jobs and what not came out to be like $5500 or so. That is reusing the stock heads, crank, rods, intake manifold, distributor, coil, etc.

I think you'd have to try out quite a few swap meets or browse online a lot to find the stroker crank, and some brodix heads that I don't think are made any longer...

If you have time and money to build that motor on the side and are more patient than I would be then go ahead. It'd be pretty damn awesome to have a turbo v6 that's not a Typhoon, Syclone, or GN smoke v8's all day long...lol


Brian

Had an 88 Monte SS in HS, sold that!
07' MC SS black, all stock (for now)
85' Monte SS project car. Flat Black, 305 w/ LT headers, drop spindles, CPP 2 inch A-body rear springs, 18" Boss 338s
http://www.youtube.com/watch?v=HeKFlFEG_Bk&feature=share&list=UUiPzUj6CEffDt2J4Rv0Iwfw
#1007684 - 07/16/14 12:32 PM Re: 4.3 build [Re: mike0806]  
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mike0806 Offline
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waldoboro me
Ive got plenty of time to look up parts since im not gonna be working on the car until i have most of the parts i need to start my restoration. Thanks for all the advice. $5500 wasnt as much as i was thinking. I agree that a V8 would produce a ton more power for that but its gonna be cool to have a V6 that will keep up, if not beat, V8s. Plus its different

#1007686 - 07/16/14 12:39 PM Re: 4.3 build [Re: mike0806]  
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mike0806 Offline
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waldoboro me
I want this car to be a cruiser as well so is this possible with what im trying to pull off with the V6?

#1007721 - 07/16/14 09:07 PM Re: 4.3 build [Re: mike0806]  
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joyride Offline
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Tacoma, Wa
Well I had $5500 just into my motor...If you're gonna want a turbo'ed or even TT'ed v6 that's gonna smoke v8s i'm not sure how streetable that's gonna be at all....lol


Brian

Had an 88 Monte SS in HS, sold that!
07' MC SS black, all stock (for now)
85' Monte SS project car. Flat Black, 305 w/ LT headers, drop spindles, CPP 2 inch A-body rear springs, 18" Boss 338s
http://www.youtube.com/watch?v=HeKFlFEG_Bk&feature=share&list=UUiPzUj6CEffDt2J4Rv0Iwfw
#1007726 - 07/16/14 10:50 PM Re: 4.3 build [Re: mike0806]  
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mike0806 Offline
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waldoboro me
Lol...id hate to do all that work just to make it a trailer queen. If i do it i wanna be able to cruise with it and if i wanna have some fun i can

#1007748 - 07/17/14 08:08 AM Re: 4.3 build [Re: mike0806]  
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BuzzLOL Offline
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Toledo, Ohio
Originally Posted By: mike0806
Sounds like this could get REALLY expensive


. If you want to just throw money at it, go nutso with HP, use only all new parts, and hire everything done, yes, would be expensive...

. If you can do most of the work yourself, satisfied with like reasonable 400-500 HP and turbo big torque, can scrounge used low-mileage turbos, TBI's, injectors, and most other parts from the junkyard, stay at 4.3L, do your own cutting and welding on piping, then it won't be so bad...

. The low priced S.S. turbo headers in that low priced turbo article I posted above could be used, just chop off one tube on each side... re-read that article 3 or 4 times to get the turbo theory down cold... take some notes so you don't forget important stuff when planning your project out... definitely go twin turbos... get used ones off wrecked low mileage vehicles, not worn out ones... those used turbos prolly better quality than cheap eBay turbos... they came with 50,000 - 100,000 mile warranties... and they come cheap with all the extra parts... grab it all...

. Mildly built turbo cars are more daily drivable streetable than big cammed V8's... here's the turbo 3.5L car I drove daily back in the 1960's (25+ MPG):

https://www.youtube.com/watch?v=iieDedNEYuI

.


'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O
#1007752 - 07/17/14 12:31 PM Re: 4.3 build [Re: mike0806]  
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502SS Offline
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502SS  Offline
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Carson City, Michigan
Buzz is correct. A mild built turbo car can be very streetable. Look at the turbo Buick cars. My last turbo Buick (an '87 Turbo T) went 11.2x@122 with a single small turbo, got great MPG, had A/C, and could cruise highway speeds without issue with the 3.42 gears and 2004R trans.


'83 Cutlass...project cheap...11.40's so far on a budget

'76 Jeep CJ5...430 SBC on spray
#1007768 - 07/17/14 04:34 PM Re: 4.3 build [Re: mike0806]  
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joyride Offline
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Tacoma, Wa
Actually they're right I don't know why I said that. Turbo motors take lower compression so they're obviously more streetable than a big cammed v8 like Buzz mentioned.


Brian

Had an 88 Monte SS in HS, sold that!
07' MC SS black, all stock (for now)
85' Monte SS project car. Flat Black, 305 w/ LT headers, drop spindles, CPP 2 inch A-body rear springs, 18" Boss 338s
http://www.youtube.com/watch?v=HeKFlFEG_Bk&feature=share&list=UUiPzUj6CEffDt2J4Rv0Iwfw
#1007774 - 07/17/14 05:56 PM Re: 4.3 build [Re: mike0806]  
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Ole Blue Offline
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Lugoff, SC
Originally Posted By: mike0806
I want this car to be a cruiser as well so is this possible with what im trying to pull off with the V6?
When I had the catalytic convertor and A.I.R. system disconnected form my 4.3, it ran GREAT. Was actually asked if I had an 8 cylinder in it.

#1007801 - 07/17/14 11:54 PM Re: 4.3 build [Re: mike0806]  
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mike0806 Offline
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waldoboro me
Thanks for all the confidence guys. I was begining to get discouraged there for a sec. I guess my next question is can i use any turbo of a gas car or are there only special ones that will work? Dont mean to sound dumb or anything but im new to the turbo scene. Ive always been a supercharger kind of guy but i think with what i want to pull off a turbo is the way to go

#1007826 - 07/18/14 09:43 AM Re: 4.3 build [Re: mike0806]  
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BuzzLOL Offline
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. Main concern is a turbo big enough... for instance, if twin turboing a 4.3L V6, want each turbo to be off a 2.15L or slightly larger 4-banger... which is totally easy to find these days... a turbo charger is just a supercharger driven by exhaust instead of a belt... of course, each has its own operating characteristics... two small turbos usually have less turbo lag/more responsive than one big heavy turbo...

. In the link I posted above, the gauge on the console is vacuum/pressure... left of center is vacuum, when the needle swings right of center it's into boost... and you can definitely feel it... if you've never driven a turbo car, I'd suggest taking one for a test drive... it's like having two different kinds of engines, depending where that needle is...

< Ole Blue: "When I had the catalytic convertor and A.I.R. system disconnected form my 4.3, it ran GREAT. Was actually asked if I had an 8 cylinder in it." >

. I seem to recall the '86-'88 EFI 4.3L V6 rated at 155 HP and the base 305" V8 rated at 145 HP... and later 4.3L's rated up to 200 HP...


'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O
#1007909 - 07/19/14 01:28 AM Re: 4.3 build [Re: mike0806]  
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Stig Offline
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Stig  Offline
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Midlothian VA
Check out the Syclone/Typhoon forum - http://www.syty.net/forums/index.php .

Your best bet is to run a setup from a Syclone or Typhoon or build something similar.

As a former Syclone owner, I will say that parts to build the 4.3 are becoming less and less common. Around 10 years ago there was a crazy amount of support for turbo 4.3 V6 builds, but almost all of that support no longer exists. It's actually near impossible to find a stroker kit for a 4.3 nowadays. I've looked into it and the company that was making the stroker kits a few years ago no longer exists. So if you want a stroker crank now you have to get one used or have one custom made (though someone please correct me if I'm wrong). The 4.3's also have some reliability issues once you start to get into some decent boost levels, and you'll need to run meth injection or E85 to keep the engine from detonating.

If you want to build one, a turbo 4.3 with vortec heads would be the best way to go. Get all the forged parts that you can find, like pistons and rods. The stock crank is good to something like 500 horsepower going from memory, but the rods and pistons in the 4.3 are pretty weak. I would also look into getting a set of V6 Vortec heads to help with potential detonation issues. If you run a computer controlled fuel injection unit from another car like a syclone/typhooon or whatever else, you'll also need some type of standalone computer harness.

To be completely honest here, it's much easier and more cost effective to just drop in a v8 crate engine.

Last edited by Stig; 07/19/14 01:29 AM.


85 Monte Carlo SS(Sold)
91 GMC Syclone (Sold)
95 Subaru Impreza (Sold)
#1007981 - 07/20/14 04:35 AM Re: 4.3 build [Re: mike0806]  
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joyride Offline
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Tacoma, Wa


Brian

Had an 88 Monte SS in HS, sold that!
07' MC SS black, all stock (for now)
85' Monte SS project car. Flat Black, 305 w/ LT headers, drop spindles, CPP 2 inch A-body rear springs, 18" Boss 338s
http://www.youtube.com/watch?v=HeKFlFEG_Bk&feature=share&list=UUiPzUj6CEffDt2J4Rv0Iwfw
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