Thanks for all the work and the video. We ran a 4.3 in a "compact demolition derby car. We had a 85 4.3. TBI. I modified the intake to run a Rochester 2BBL. The only portwork I done was down just past where the runners turned. I also put some grooves in places to help atimise the fuel. Of course using the "SWAG THEORY ".total advance was 34 degrees. Initial was around 8-10 where ever it started the best.Also had a cheap torque cam. Ran great and ran it at 5 derbies. Just changed the head gaskets 1 time. Of course ran Mobil 1 racing oil. Won 2-3 times can't remember. The last one was the most exciting to watch ever.
That is good and advice for anyone with interest in the Automotive industry. I don't want to create a conflict with older generation technicians. But experienced techs, no matter our age, use that technique on a daily basis. That's what newer technicians gain with experience unless they are already familiar with using their hands. Experience brings tactile finesse.
Great project/article. Hot Rod magazine did an article on these engines a while back, before the typhoon engines came out. They did say the head flow on this engine would be a problem.
w41duvernay When you see the factory SyTy heads you’ll ask why, why would anyone design a head so poorly. 😳. Thankfully there were much better options available after the fact. The Turbo 4.3 could have been refined making it awesome if GM hadn’t abandoned the idea, look at all the hype both GM and Ford are getting for the Turbo cars now! This power could have been ours from the factory back in the late 80’s in the GN’s and through the 1990’s in the SyTy platform. GM dropped the ball. 😵. Thanks for talking with me have a safe Turkey Day!
HeadFlowInc I too agree GM dropped the ball on not improving on the turbo 4.3. I have one sitting in my garage now that I’ve been wanting to build on eventually. Any idea if the marine intake would be of any benefit on a ‘99 engine with the turbo?
Backyardmech1 I’ve seen people use the Marine intake setup with boost many times. I think you have more choices with throttle bodies. There’s definitely benefits
HeadFlowInc I have no doubt throttle body has more choices. You could do heads and cams without reprogramming an ECU and the 96 and newer OBDII standard that has to be kept. Thanks for the quick response. I’m just looking for ideas to keep a truck “streetable” with forced induction and keeping legal on the street via monkey at the inspection station with a computer. As of now I have a stock engine with the goodies added on like an MSD, headers, bored and ported throttle body, and MFI injection setup with engine out exhaust. Runs strong, but not a v8.
Jason Farquhar 4.3 are decent until you get above 550hp, then they get really expensive. The factory crankshaft isn’t very strong especially if they have the split Rod journals. NASCAR 4.3 forged crankshaft are like $2800 bare casting if you can find one. 😳 This Turbo build started flexing/bending the OEM SyTy Nodular iron crankshaft at 600+ hp. In a mild application the 4.3 can be a strong runner! I think the heads from this Turbo build are for sale right now. JD
Jason Farquhar Did you know GM made a V8 4.3 L99 on the LT1 platform? It was available for a short time starting around 1994. The baby LT1 had a short 3.00” stroke crankshaft. If someone wanted, they could use the 3.00” stroke crankshaft in a LT1 350 block to build a GM “302 CID” 😉
@@HeadFlowInc Cheap v6 stroker. Offset grind a 4.3 v6 crank and put some radius on the crank grind to 2" rods use 229 bearings might have to chamfer bearing depending on radius and use the 4.3 v8 "baby lt1" con rods to make up the stroke difference for a cheaper or with stock parts v6 stroker.
How would this motor be for a 2001 Chevy S10 It is AZR2 package please please comment back looking to put a little bit of power under the hood Thank you very much for this video
Honestly, for the money it takes to Turbo a 4.3 you get way more return on investment doing a 4.8/5.3 swap w/turbo. This 4.3 made 650+ HP which ended up bending the stock crankshaft wiping out a Main bearing, nothing broke before we found the issue. I don’t know if the newer style 4.3 engines might be stronger? JD
I'd be hard press to think it will make 600 to the wheels may at the crank 425 at the wheels on 12 to 15 boost! Im spit balling would love to see the dyno on this bad boy
No way that engine would make 600 rwhp @ 14# of boost, we were talking crankshaft HP. With a driveline loss of 30% the AWD guys generally see 600 tire would be $$$ +- 855 crank hp.. Honestly, he kept breaking parts and never got it all the way tuned or optimized before switching to the LS 5.3 setup. The new driveline has been built where he says it will hold up! Leaving with Zero boost on a 1.88 60' it ran a 7.61 1/8th mile race weight 3800# That;s no where near it's potential. On the 7.61 pass at roughly 12# boost it calculated to 570ish HP at the crank, no telling what kind of power she could have made around 20-24# Definetly enough power to break the factory crankshaft surely... lol Looking for big gains this time, shhhh it's a secret!
Virtually all and any improving to the vortec head is going to be in the bowl area and getting a good quality valve seat done.. you will gain nothing by a gasket match. install a 2.02 valve and get the throat to about 90% of the seat area and theres your best benefit.. but in reality, to hit 600 you will need the bowtie or the brodix head and about 25-30 psi
Well, I appreciate your sharing of information on valves and throat percentages. I’m not sure if you realize we exceeded 600hp well under the boost you thought necessary. Max boost we ran was 18-20# before it bent the crankshaft and wiped a main bearing. I’m not sure what your background is with porting or building high HP engines, but I will say your partial right. Clearly my cylinder heads were flowing much better than you expected. JD
I just took on a fun little 4.3 projects in my shop. I've done v8 boosted stuff for many years and this one has me excited a little.. going with a common pin crank odd fire and bowtie 18 degrees. have to custom fab a sheet metal intake. this will be twin turbo deal. Wish the aftermarket gave these mini sb a little more attention.
@@pablojanski.2559 I never claimed 600 whp, 600hp crankshaft. I will warn you, the split rod journal crankshafts won’t hold much over 650hp crankshaft very long at all. We ran a factory “Nodular Iron” SyTy specific crankshaft with H-beams and Forged pistons. We got lucky, the crankshaft bent before breaking and we caught it! The only option for high HP 4.3 builds uses the very hard to find NASCAR 4.3 forged crankshafts. When we looked the raw casting ranged from $2800-3500.00 😳😳😳. I’d think you could order a custom crankshaft but who knows the cost. The 4.3 could have been an awesome platform if it would of had aftermarket support. JD
What would you recommend I do for a 04 silverado with 4.3 v6 I don't think I will go with a turbo just want a little more power while keeping somewhat stock parts
TX militia You’d be surprised how much more useable power you will get having your truck professionally tuned. You’ll gain HP & TQ plus the power will be on demand not delayed. The factory doesn’t tune for max power, plus there are power enrichment parameters and delays severely reduce performance. 👍 I’m not sure if you would want/need a cam swap, depends how you intend to use the truck.
It you aren't the type that must have a turbo, a professional tune will make a big difference, especially in the low end TQ, throttle response, and power high and low, it will be a big difference if done properly, along with trans tuning for auto transmission, I'd start there, maybe atleast a performance muffler, or exhaust, and a K&N filter, or cold air intake, the tune will pull it all together! Get rid of the p.e. delay, with the tune!
I have heard of a Honda B16 making 500hp at 19psi so i would hope this would make more with over 2 1/2 times the displacement. Granted it will not spin to as high of an RPM
Unfortunately once he exceeded 600-650 hp it started flexing the factory crankshaft and smeared a main bearing! We caught the issue before any major damage occurred, the Typhoon is now Turbo 5.3 LS. JD
Great video. I'm gettin a stock remanufactured 85 v6 4.3 throttle body injection for my caprice(same engine). I'm not a racer, just want more power, noticeable power. Any parts suggestions ?
Normally I say camshaft is the best choice for making more power. The factory cams are so conservative and designed for fuel mileage they leave a lot of potential. I don’t know how hard it will be to tune a 1985 TBI setup, I’ve never had any success with them. In comparison a regular carburetor, dual plane intake and an HEI runs circles around the TBI and any decent mechanic can tune it. JD
Great video. Any advice on power upgrade for '85 chevy caprice 4.3 v6 early throttle body injection?. It is in the shop getting motor replaced with same type of motor.
Jamal Cole Sorry, the old 1985 4.3 are before the better fuel injection setups, so I'm not sure how tough it would be to Turbo. If you could Turbo your 4.3 it's the best power adder but will require Premium fuel only. Is your 85 still carburetor?
HeadFlowInc Sorry for the very late reply. Its throttle body injected. As of now im more concerned of this trans leak. Most likely front pump seal leak.
We ended up building the block without the balance shaft. Richard bought the other balance shaft block because it had aftermarket splayed main caps but found out it uses a different camshaft. I don’t remember what year it was. JD
David Pinkham I’m trying to find out, all the 4.3’s we built were between 1991-1993 non-counter shaft engines. I’ve heard the Newer 4.3’s are pretty strong.
David Pinkham Ok, to run the SyTy intake on the “Vortec” 4.3 heads you’ll need to have the heads adapted to accept the older manifold bolt pattern. It’s not a big deal just locating, drilling and tapping the holes. Also check the intake port alignment before committing, I think there may be an issue with port height needed to seal a gasket.
HeadFlowInc thanks for the replies. Someone also told me on a Facebook group that the syty headers will fit but a crossmember needs o be cut? Would u know about that?
meyaw Abdulaziz The stock crankshaft is a weak design. It’s hard to say for certain but anything over 500hp at the crankshaft would definitely be a gamble. What people forget is the Torque is very high on boosted applications and Torque does the most damage. JD
I am actually considering a blown 4.3 v6...for reference does anyone have any idea what stock crank and rods can handle....not looking for 600hp on first try...just need to know starting point....with stock rotating assembly....
I think it depends on which generation 4.3 you’re using. In out build at 650 hp crankshaft it bent the crankshaft and wiped a main bearing. Thank goodness it didn’t break and take everything with it. JD
@@HeadFlowInc Thanks for the info...I got a 91 4.3 out of a 4x4 s10 blazer...there are centrifugal superchargers , 4-71 roots and turbos available..whichever I would be quite happy with 400 to 450 hp...that would be a good square one start. I'll have to check out the other videos, for tips, and parts. I might need to ask for part info from time to time...thanks again....
Rod Wesling A flow bench is a great tool for validating port work and efficiency. Having heads flowed isn’t mandatory unless you want/need to verify the heads. If it’s your first time working a set of particular heads then yes it’s good to flow them. After you’ve established a proven port for a given head there’s no reason to flow every head unless it’s to help sell them.
Honestly I’m not super familiar with the 4.3 but application is everything. I’m not sure what a good option would be if the SyTy intake wasn’t available. Also verify what bolt pattern your heads have for the intakes to make sure they’re compatible without extra machining costs. There’s some later model 4.3 engines making good power you could look into. JD
GHSTTHERENEGADE BOOST and head flow will get the 1000 hp, but don't waste time with a factory block. A set of good casting aluminum heads would be a good platform.
Paul Gale we ended up not using the balance shaft block, the valve train we had doesn't fit the balance shaft block. Instead we built a different 4.3 block 1992 Syclone with the 2 bolt nodular main caps and ARP studs. We used a different set of H-beams and Forged pistons you see in the shaft engine.
Logan Milliner Plumb a Turbo on the engine and tune it! The amount of Boost will dictate the required fuel injector size. Also the amount of Boost has to do with octane required. Decide what kind of power you want to make.
Logan Milliner That's why I asked how much power do you want? Low boost the ring gaps are fine stock, but when you get above say 5-7# then yes you'll need to set the ring gaps wider matched to the boost level.
what about that fuel "spider" setup that everyone is always calling a nightmare for anyone trying to get any decent power from? How complicated is it to just scrap it and bypass it with a after market fuel injection setup?
DonkeyTeeth you could 1, either marine swap it which will be about a thousand for the intake on eBay, or you could buy a dual plane Edelbrock carbureted intake and weld injector bungs in them and put a Holley elbow with a 90mm throttle body for about 500-600$
blackericdenice LOL, you have no idea what you’re talking about comparing a 1993 power plant to a 2020 Ford GT. But hey, if you feel empowered feel free to contact all those Syclone and Typhoon owners to pass on your opinion, I’m sure they will all be happy! 😉👍
@@HeadFlowInc When someone say, "You don't know what you're talking about" They are just trying to get me to think I'm wrong. What about a 1987 Ferrari F40. It had a 2.9 twin Turbo v8 and made 478 hp or 2.7 hp per cuin. If that engine was a 4.3. It would make 707 hp. Like side earlier. You are just trying to make a big deal.
@@blackericdenice apples to oranges. These are not "modern" dohc cylinder heads. They do not flow air anywhere close to the engine examples you listed. So yes, lots of port work has to be done. These were never engineered with 600hp in mind. It's not magic
AFdesigns The 4.3's can make 1100 hp but it takes an expensive aftermarket crankshaft and block to hold the power. Do a search for MrSyclone to see what he does with the 4.3
@AFdesigns It's all about your wallet size. If you wanted to build a 3500hp 4 banger you could, but it would be stupidly expensive. @HeadFlowInc Nice build, is it finished yet?
GoffFamilyRacing33 Oh yeah it was done and we tried tuning it until it smoked the Mad Dog stage 3 700r4! We were making good power running 7.61 1/8th mile 3800# race weight and that's with ZERO boost on the launch! 7.61 = 11.94 1/4 mile Richards currently swapping the 700r4 to a 4L80e with PTC 3500 converter, 2 step, upgrading to an 8.5" rear w/Caltracs. The plan is to get into the 10's this year!!! 7.00 1/8 is equal to a 10.99 1/4 Being able to launch under Boost alone will get is low 11's so getting 10's are very doable.
Thanks for all the work and the video. We ran a 4.3 in a "compact demolition derby car. We had a 85 4.3. TBI. I modified the intake to run a Rochester 2BBL. The only portwork I done was down just past where the runners turned. I also put some grooves in places to help atimise the fuel. Of course using the "SWAG THEORY ".total advance was 34 degrees. Initial was around 8-10 where ever it started the best.Also had a cheap torque cam. Ran great and ran it at 5 derbies. Just changed the head gaskets 1 time. Of course ran Mobil 1 racing oil. Won 2-3 times can't remember. The last one was the most exciting to watch ever.
"Your fingers will tell you everything you need to know. " That's priceless information for today's "Technicians" that do not know what a mechanic is.
Put that on some merch!
That is good and advice for anyone with interest in the Automotive industry. I don't want to create a conflict with older generation technicians. But experienced techs, no matter our age, use that technique on a daily basis.
That's what newer technicians gain with experience unless they are already familiar with using their hands. Experience brings tactile finesse.
sex life advice
A 4.3 is just like a V8 5.7 small block with 2 cilinders cut off
Josh 98 Sort of, the crankshaft has split/rotated rod journals makes the crankshaft weak. You can use 350 pistons in a 4.3 though! 👍
Great project/article. Hot Rod magazine did an article on these engines a while back, before the typhoon engines came out. They did say the head flow on this engine would be a problem.
w41duvernay When you see the factory SyTy heads you’ll ask why, why would anyone design a head so poorly. 😳. Thankfully there were much better options available after the fact. The Turbo 4.3 could have been refined making it awesome if GM hadn’t abandoned the idea, look at all the hype both GM and Ford are getting for the Turbo cars now! This power could have been ours from the factory back in the late 80’s in the GN’s and through the 1990’s in the SyTy platform. GM dropped the ball. 😵. Thanks for talking with me have a safe Turkey Day!
HeadFlowInc I too agree GM dropped the ball on not improving on the turbo 4.3. I have one sitting in my garage now that I’ve been wanting to build on eventually. Any idea if the marine intake would be of any benefit on a ‘99 engine with the turbo?
Backyardmech1 I’ve seen people use the Marine intake setup with boost many times. I think you have more choices with throttle bodies. There’s definitely benefits
HeadFlowInc I have no doubt throttle body has more choices. You could do heads and cams without reprogramming an ECU and the 96 and newer OBDII standard that has to be kept. Thanks for the quick response. I’m just looking for ideas to keep a truck “streetable” with forced induction and keeping legal on the street via monkey at the inspection station with a computer. As of now I have a stock engine with the goodies added on like an MSD, headers, bored and ported throttle body, and MFI injection setup with engine out exhaust. Runs strong, but not a v8.
Backyardmech1 Even adding mild boost 5-10# would be a good start. I’m not sure what the rules are for passing a smog test though. 🤔
My dad's doing. 327 right now but he asked why not a 4.3? Why don't people beef those up more often instead of a 350. Theyre nice motors.
Jason Farquhar 4.3 are decent until you get above 550hp, then they get really expensive. The factory crankshaft isn’t very strong especially if they have the split Rod journals. NASCAR 4.3 forged crankshaft are like $2800 bare casting if you can find one. 😳
This Turbo build started flexing/bending the OEM SyTy Nodular iron crankshaft at 600+ hp.
In a mild application the 4.3 can be a strong runner! I think the heads from this Turbo build are for sale right now. JD
Jason Farquhar Did you know GM made a V8 4.3 L99 on the LT1 platform? It was available for a short time starting around 1994.
The baby LT1 had a short 3.00” stroke crankshaft.
If someone wanted, they could use the 3.00” stroke crankshaft in a LT1 350 block to build a GM “302 CID” 😉
I've put 300k on a 93 Astro van then on my current 4.3 S10 I have 160k hard miles pulling a trailer
@@HeadFlowInc Cheap v6 stroker. Offset grind a 4.3 v6 crank and put some radius on the crank grind to 2" rods use 229 bearings might have to chamfer bearing depending on radius and use the 4.3 v8 "baby lt1" con rods to make up the stroke difference for a cheaper or with stock parts v6 stroker.
Ima put one in a pontiac fiero with a 60mm turbskie for fun. Just gonna send it.
OrganicbacOn I’m going same way in my4.3
What no videos?
I like the way you think sir...👍🏻
How would this motor be for a 2001 Chevy S10 It is AZR2 package please please comment back looking to put a little bit of power under the hood Thank you very much for this video
Honestly, for the money it takes to Turbo a 4.3 you get way more return on investment doing a 4.8/5.3 swap w/turbo.
This 4.3 made 650+ HP which ended up bending the stock crankshaft wiping out a Main bearing, nothing broke before we found the issue.
I don’t know if the newer style 4.3 engines might be stronger? JD
I'd be hard press to think it will make 600 to the wheels may at the crank 425 at the wheels on 12 to 15 boost! Im spit balling would love to see the dyno on this bad boy
No way that engine would make 600 rwhp @ 14# of boost, we were talking crankshaft HP. With a driveline loss of 30% the AWD guys generally see 600 tire would be $$$ +- 855 crank hp.. Honestly, he kept breaking parts and never got it all the way tuned or optimized before switching to the LS 5.3 setup. The new driveline has been built where he says it will hold up! Leaving with Zero boost on a 1.88 60' it ran a 7.61 1/8th mile race weight 3800# That;s no where near it's potential. On the 7.61 pass at roughly 12# boost it calculated to 570ish HP at the crank, no telling what kind of power she could have made around 20-24# Definetly enough power to break the factory crankshaft surely... lol Looking for big gains this time, shhhh it's a secret!
Well you lost a bet
Virtually all and any improving to the vortec head is going to be in the bowl area and getting a good quality valve seat done.. you will gain nothing by a gasket match. install a 2.02 valve and get the throat to about 90% of the seat area and theres your best benefit.. but in reality, to hit 600 you will need the bowtie or the brodix head and about 25-30 psi
Well, I appreciate your sharing of information on valves and throat percentages. I’m not sure if you realize we exceeded 600hp well under the boost you thought necessary. Max boost we ran was 18-20# before it bent the crankshaft and wiped a main bearing.
I’m not sure what your background is with porting or building high HP engines, but I will say your partial right.
Clearly my cylinder heads were flowing much better than you expected. JD
@@HeadFlowInc at the wheels?
I just took on a fun little 4.3 projects in my shop. I've done v8 boosted stuff for many years and this one has me excited a little.. going with a common pin crank odd fire and bowtie 18 degrees. have to custom fab a sheet metal intake. this will be twin turbo deal. Wish the aftermarket gave these mini sb a little more attention.
@@pablojanski.2559 I never claimed 600 whp, 600hp crankshaft.
I will warn you, the split rod journal crankshafts won’t hold much over 650hp crankshaft very long at all. We ran a factory “Nodular Iron” SyTy specific crankshaft with H-beams and Forged pistons. We got lucky, the crankshaft bent before breaking and we caught it!
The only option for high HP 4.3 builds uses the very hard to find NASCAR 4.3 forged crankshafts. When we looked the raw casting ranged from $2800-3500.00 😳😳😳. I’d think you could order a custom crankshaft but who knows the cost.
The 4.3 could have been an awesome platform if it would of had aftermarket support. JD
What would you recommend I do for a 04 silverado with 4.3 v6 I don't think I will go with a turbo just want a little more power while keeping somewhat stock parts
TX militia You’d be surprised how much more useable power you will get having your truck professionally tuned. You’ll gain HP & TQ plus the power will be on demand not delayed. The factory doesn’t tune for max power, plus there are power enrichment parameters and delays severely reduce performance. 👍
I’m not sure if you would want/need a cam swap, depends how you intend to use the truck.
@@HeadFlowInc it's gonna be a daily driver work and back mostly but I want to add H/P definitely
TX militia Definitely Tune! 👍
@@HeadFlowInc ok thanks
It you aren't the type that must have a turbo, a professional tune will make a big difference, especially in the low end TQ, throttle response, and power high and low, it will be a big difference if done properly, along with trans tuning for auto transmission, I'd start there, maybe atleast a performance muffler, or exhaust, and a K&N filter, or cold air intake, the tune will pull it all together! Get rid of the p.e. delay, with the tune!
Kind of a long shot, but anyone know where I can find a intake manifold like this?
I have heard of a Honda B16 making 500hp at 19psi so i would hope this would make more with over 2 1/2 times the displacement. Granted it will not spin to as high of an RPM
Unfortunately once he exceeded 600-650 hp it started flexing the factory crankshaft and smeared a main bearing! We caught the issue before any major damage occurred, the Typhoon is now Turbo 5.3 LS. JD
Your on dude I'm doing mine now
Dang UA-cam kept these videos hidden from me
How your 4.3 going
Great video. I'm gettin a stock remanufactured 85 v6 4.3 throttle body injection for my caprice(same engine). I'm not a racer, just want more power, noticeable power. Any parts suggestions ?
Normally I say camshaft is the best choice for making more power. The factory cams are so conservative and designed for fuel mileage they leave a lot of potential.
I don’t know how hard it will be to tune a 1985 TBI setup, I’ve never had any success with them. In comparison a regular carburetor, dual plane intake and an HEI runs circles around the TBI and any decent mechanic can tune it. JD
Great video. Any advice on power upgrade for '85 chevy caprice 4.3 v6 early throttle body injection?. It is in the shop getting motor replaced with same type of motor.
Jamal Cole Sorry, the old 1985 4.3 are before the better fuel injection setups, so I'm not sure how tough it would be to Turbo. If you could Turbo your 4.3 it's the best power adder but will require Premium fuel only.
Is your 85 still carburetor?
Put 350 in it
HeadFlowInc Sorry for the very late reply. Its throttle body injected. As of now im more concerned of this trans leak. Most likely front pump seal leak.
Thats not a 4.3. Unless its swapped you got a 3.8 like the GN had.
Balance shaft engine ? I thought that was post 93
We ended up building the block without the balance shaft. Richard bought the other balance shaft block because it had aftermarket splayed main caps but found out it uses a different camshaft. I don’t remember what year it was. JD
Will the syty manifold fit on a 2004 Silverado with the 4.3?
David Pinkham I’m trying to find out, all the 4.3’s we built were between 1991-1993 non-counter shaft engines.
I’ve heard the Newer 4.3’s are pretty strong.
David Pinkham Ok, to run the SyTy intake on the “Vortec” 4.3 heads you’ll need to have the heads adapted to accept the older manifold bolt pattern. It’s not a big deal just locating, drilling and tapping the holes. Also check the intake port alignment before committing, I think there may be an issue with port height needed to seal a gasket.
HeadFlowInc thanks for the replies. Someone also told me on a Facebook group that the syty headers will fit but a crossmember needs o be cut? Would u know about that?
David Pinkham Not sure, it must be related to where the manifolds dump on the crossover. It must not be to bad if people have done it? 🤔
i have a 2001 astro van...
how far can reliably boost the thing using stock crankshaft....
meyaw Abdulaziz The stock crankshaft is a weak design. It’s hard to say for certain but anything over 500hp at the crankshaft would definitely be a gamble. What people forget is the Torque is very high on boosted applications and Torque does the most damage. JD
@@HeadFlowInc yes its what destroy the drive train mainly engine and transmission
I am actually considering a blown 4.3 v6...for reference does anyone have any idea what stock crank and rods can handle....not looking for 600hp on first try...just need to know starting point....with stock rotating assembly....
I think it depends on which generation 4.3 you’re using. In out build at 650 hp crankshaft it bent the crankshaft and wiped a main bearing. Thank goodness it didn’t break and take everything with it. JD
@@HeadFlowInc Thanks for the info...I got a 91 4.3 out of a 4x4 s10 blazer...there are centrifugal superchargers , 4-71 roots and turbos available..whichever I would be quite happy with 400 to 450 hp...that would be a good square one start. I'll have to check out the other videos, for tips, and parts. I might need to ask for part info from time to time...thanks again....
Do you recommend Flowing the heads ? Thanks Rod
Rod Wesling A flow bench is a great tool for validating port work and efficiency. Having heads flowed isn’t mandatory unless you want/need to verify the heads. If it’s your first time working a set of particular heads then yes it’s good to flow them. After you’ve established a proven port for a given head there’s no reason to flow every head unless it’s to help sell them.
Where can I get this?
D. Hernandez If you mean the intake you could try looking in the SyTy online forums. Those intakes came on the Syclone and Typhoons. JD
@@HeadFlowInc what intake manifold would be the best upgrade?
Honestly I’m not super familiar with the 4.3 but application is everything. I’m not sure what a good option would be if the SyTy intake wasn’t available. Also verify what bolt pattern your heads have for the intakes to make sure they’re compatible without extra machining costs. There’s some later model 4.3 engines making good power you could look into. JD
@@HeadFlowInc I'm not trying to race it or anything even close. Just want it to run perfectly and get great gas mileage.
So to make 1k of horse and 900 of torque what exactly are we looking at in cost and builds?
GHSTTHERENEGADE BOOST and head flow will get the 1000 hp, but don't waste time with a factory block. A set of good casting aluminum heads would be a good platform.
I've heard of a guy who built a quad turbo 4.3 putting out 2300 horse.
What intake manifold is that ??
GM oem SyTy or Syclone and Typhoon Turbo 4.3 intake manifold. Two piece intake setup with the upper plenum and lower. JD
@@HeadFlowInc SyTy lower will work with 96+ vortec heads?
Iirc it takes modification to bolt on.
@@sovietunion3572 www.tyclone.com/syty/wrench-it/vortec-heads-syclone-typhoon-conversion/
Where are you located ?
Raymore, Mo. just South of Kansas City.
Is that a 93 block with the balance shaft? Awesome build !
Paul Gale we ended up not using the balance shaft block, the valve train we had doesn't fit the balance shaft block.
Instead we built a different 4.3 block 1992 Syclone with the 2 bolt nodular main caps and ARP studs.
We used a different set of H-beams and Forged pistons you see in the shaft engine.
What model of pistons are those?
Jeffrey Andrew Meade Those are Speed Pro Forged Pistons. SBC 350 .030
Thanks!
What base is that? it looks stock
Robert Frank Fully ported SyTy lower intake we matched to a Renz Fab upper.
what would the requirements needed to turbo my 2002 4.3?
Logan Milliner Plumb a Turbo on the engine and tune it! The amount of Boost will dictate the required fuel injector size. Also the amount of Boost has to do with octane required. Decide what kind of power you want to make.
HeadFlowInc im just worried about piston ring gap and all the other small details that go into it
Logan Milliner That's why I asked how much power do you want? Low boost the ring gaps are fine stock, but when you get above say 5-7# then yes you'll need to set the ring gaps wider matched to the boost level.
HeadFlowInc ah okay thanks! i was. probably going to run 6 lbs max nothing too serious
is there a way to change out the stock spyder injectors? maybe switch to a carb. is that a possibility?
How much for this build?
I don't know for sure, I can try to ask Richard
HeadFlowInc ok thanks
sumpunkster
As best as we can recall, it may not include all the tiny stuff and machine shop but the total cost was around $6000
@@HeadFlowInc ....ahhh....not what i wanted to hear but thanks
what about that fuel "spider" setup that everyone is always calling a nightmare for anyone trying to get any decent power from? How complicated is it to just scrap it and bypass it with a after market fuel injection setup?
DonkeyTeeth I've not used the Spider injection only the direct port style.
DonkeyTeeth Marine intake swap.
DonkeyTeeth you could 1, either marine swap it which will be about a thousand for the intake on eBay, or you could buy a dual plane Edelbrock carbureted intake and weld injector bungs in them and put a Holley elbow with a 90mm throttle body for about 500-600$
600 hp from a boosted 4.3 with a cam does not need all porting. You are just trying to make a big deal. Ford new GT make 647 from a 3.5 v6.
blackericdenice LOL, you have no idea what you’re talking about comparing a 1993 power plant to a 2020 Ford GT. But hey, if you feel empowered feel free to contact all those Syclone and Typhoon owners to pass on your opinion, I’m sure they will all be happy! 😉👍
@@HeadFlowInc When someone say, "You don't know what you're talking about"
They are just trying to get me to think I'm wrong.
What about a 1987 Ferrari F40. It had a 2.9 twin Turbo v8 and made 478 hp or 2.7 hp per cuin. If that engine was a 4.3. It would make 707 hp. Like side earlier. You are just trying to make a big deal.
@@blackericdenice apples to oranges. These are not "modern" dohc cylinder heads. They do not flow air anywhere close to the engine examples you listed. So yes, lots of port work has to be done. These were never engineered with 600hp in mind. It's not magic
@@benruether8294 Upload a video of you installing a cam and i may believe you.
Ive seen a twin turbo 4.3 1200hp here on UA-cam
Josh Duttarer Mr Syclone I think has the fastest Turbo 4.3
1100hp gtr´s are v6s
AFdesigns The 4.3's can make 1100 hp but it takes an expensive aftermarket crankshaft and block to hold the power. Do a search for MrSyclone to see what he does with the 4.3
Yeah way out of my price range
@AFdesigns It's all about your wallet size. If you wanted to build a 3500hp 4 banger you could, but it would be stupidly expensive. @HeadFlowInc Nice build, is it finished yet?
GoffFamilyRacing33 Oh yeah it was done and we tried tuning it until it smoked the Mad Dog stage 3 700r4! We were making good power running 7.61 1/8th mile 3800# race weight and that's with ZERO boost on the launch!
7.61 = 11.94 1/4 mile
Richards currently swapping the 700r4 to a 4L80e with PTC 3500 converter, 2 step, upgrading to an 8.5" rear w/Caltracs. The plan is to get into the 10's this year!!!
7.00 1/8 is equal to a 10.99 1/4
Being able to launch under Boost alone will get is low 11's so getting 10's are very doable.
4.3L Syclone cam out in 1992. That's way back when the R32 was making 300
Purty