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Old 09-11-2004, 01:57 PM   #1 (permalink)
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**230 Hp 4.3**

anybody know any more about this engine

http://www.classicairboats.com/pages/230hpV6spec.html

I would love to buy one and stick it in my toy Is there any difference between a marine engine and a regular engine?
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Old 09-11-2004, 02:14 PM   #2 (permalink)
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Main differences are usually the cam, more compression, and total lack of emissions equipment, in most marine apps, the 4.3 is fed by a Q-Jet...
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Old 09-11-2004, 02:23 PM   #3 (permalink)
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220/230HP model is MPI The carb feed 4.3 is only a 2BBL and 190 HP
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Old 09-11-2004, 02:40 PM   #4 (permalink)
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I built a 4.3 for a toyota, we used vortec heads and the biggest COMP cam they list in the online catalog with a 600 cfm holley vac sec. It made 272 hp and 300 ft lbs of torque. We used flat top 4 valve relief pistons and a edelbrock intake running the factory header type manifold. Only thing I would do differently is to run a 390 cfm Holley vac sec cause at 6000 its only pulling about 370 cfm.

I say go for it, its more then you need in a toyota.
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Last edited by TPIJeep; 09-11-2004 at 04:11 PM. Reason: Found Dyno Sheet, Updated
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Old 09-11-2004, 02:41 PM   #5 (permalink)
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we used a couple of their 5.7Ls in one of our boats...very easy setup but I think I would rather pay almost the same price and get one of the advance adapters engines (or something similar)...we paid about $3500 each but we usually get a killer price break so I dont know what normal price would be...to give you an idea, we pay $9K-$12.5K for brand new merc 250 outboards and I believe they list for somewhere around $20K-$25K...

EDIT: The one thing that is nice about these merc engines is they are fully self contained...even the computer mounts on the engine. In a recent one of the HP mags (dont know which one for sure) they had a guy that built a 4.3L and got reliable 300HP for around $3K (that includes everything but the original block)
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Old 09-11-2004, 04:18 PM   #6 (permalink)
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I want to stick with my tbi unit I have on the 4.3 that is in the truck right now. I know I will have to get the ecm reprogramed but for rock crawing fi is the only way to go.

I would like to just get a strong reliable(200+hp) 4.3 that will still work with the stock tbi. If anyone can find any info on building one to get that kind of power from a tbi I would be happy. I have searched the net for about a week now and can't find any good info on what cam,heads, comp. ratio...ect to get a strong 200 hp.
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Old 09-11-2004, 04:31 PM   #7 (permalink)
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Quote:
Originally Posted by TOY 2
I want to stick with my tbi unit I have on the 4.3 that is in the truck right now. I know I will have to get the ecm reprogramed but for rock crawing fi is the only way to go.

I would like to just get a strong reliable(200+hp) 4.3 that will still work with the stock tbi. If anyone can find any info on building one to get that kind of power from a tbi I would be happy. I have searched the net for about a week now and can't find any good info on what cam,heads, comp. ratio...ect to get a strong 200 hp.
The combo I used with about a 9:1 compression will work fine with your TBI and make at least 250 hp. Just get the PROM reprogrammed for the cam specs..
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Old 09-11-2004, 06:28 PM   #8 (permalink)
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dont 4.3's come stock with 200 hp?
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Old 09-11-2004, 06:54 PM   #9 (permalink)
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dont 4.3's come stock with 200 hp?
yes,but not the tbi motor he is asking about.150hp.
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Old 09-11-2004, 07:24 PM   #10 (permalink)
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those motors kick ass, they are the same as the volvo boats, which are just 4.3's with volvo badgeing, they sound like v-8's with duals and flows. and makes you think there is one under the hood. well worth the money.
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Old 09-11-2004, 08:16 PM   #11 (permalink)
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Quote:
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The combo I used with about a 9:1 compression will work fine with your TBI and make at least 250 hp. Just get the PROM reprogrammed for the cam specs..

So use the Vortec heads a big cam and lower the compression to 9:1 Did you have your 4.3 dynoed?
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Old 09-11-2004, 09:16 PM   #12 (permalink)
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Yes I dynoed the 4.3 on my dyno. we used stock vortec heads, port matched the intake, and used cast flat top 4 valve relief pistons. I used a comp cam High Energy Series.. Part number 18-124-4 268 duration and .454 lift with roller rockers. The comp ratio came out to around 9:1-9.3:1. If you find a good PROM burner it will be all good. You need to flow about 375 cfm thru the Throttle body. We built this motor for under 1200 and that included the cores on the heads, the valve job, new valves, new pistons, rings, bearings boring the block .030 over, cam, lifters, roller rockers, and full gasket set.
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Old 09-11-2004, 09:47 PM   #13 (permalink)
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do you have a write up on this rebuild?What do you mean by "vortec heads"? are you talking about 96 and newer heads? I searched the part # you gave for the cam and could not find anything? Did the engine idle fine with that cam? or should I go with a milder cam for rock crawling? Do you know by chance what cfm the stock throttle body flows? I hope I'm not being a thorn in your side Thanks for all your help
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Old 09-11-2004, 10:02 PM   #14 (permalink)
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The cam is listed here http://www.compcams.com/Technical/Cu...ML/124-127.asp last one under the High Energy series.. I have no write up, we build to many motors to write about all of them..

The heads are vortec style, same combustion chamber shape as the v-8 vortec, I believe its the 96 and up, kidney shaped chamber. The motor will idle at 650 rpm and really has very little lope. Its in a Yota that we will soon link out for crawlin'
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Old 09-12-2004, 12:08 AM   #15 (permalink)
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I believe they started using Vortec 4.3s in 94.
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Old 09-12-2004, 12:49 AM   #16 (permalink)
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Actually the 4.3 was called, "Vortec" in 1985. But the "Vortec" heads you guys are referring to started in late 1992 or so on the vin code "W" engines.
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Old 09-12-2004, 01:19 PM   #17 (permalink)
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could I use a trottle body off of a 305 or 350 to get the cfm that I will need? If that won't work could I just buy an adjustable fuel regulator and turn up the fuel delivered to the engine? I'm assuming that my secound suggestion would not work because it still wouldn't get enough air
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Old 09-12-2004, 05:36 PM   #18 (permalink)
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check this out

http://www.speedomotive.com/4.3%20ch...t%20master.htm


Looks like these engines are easy to get hp out of
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Old 09-13-2004, 12:20 PM   #19 (permalink)
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could I use a trottle body off of a 305 or 350 to get the cfm that I will need?
The only difference in the 4.3, 305, and 350 TBI units is the injectors (and of course the chip in the computer).

Pete
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Old 09-13-2004, 04:40 PM   #20 (permalink)
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who makes the intake that you are using to put the carb intake on vortec heads?

I would like to use vortec heads with on my tbi motor - I think I would just need a t-body adapter and a chip burned.

any inputs?
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Old 09-13-2004, 05:02 PM   #21 (permalink)
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The only difference in the 4.3, 305, and 350 TBI units is the injectors (and of course the chip in the computer).

Pete


so your saying that the 350 throttle body flows the same cfm as the 4.3 throttle body?
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Old 09-13-2004, 05:17 PM   #22 (permalink)
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so your saying that the 350 throttle body flows the same cfm as the 4.3 throttle body?
Yes that is right. Holley sells a replacement TBI unit that is larger to flow more air and turbo city sells a rebuilt one that they bore out to flow more air also. The key part of a EFI motor is get as much air in it as possible and the computer will add the fuel it needs.
I would like to know more about adding the vortec heads myself. Arent the intake bolt at a different angle?
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Old 09-13-2004, 05:34 PM   #23 (permalink)
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I have a 99' motor in my yota right now ~190 hp and am looking for more power. My buddy has an 89 tbi motor with the edelbrock performer intake and cam in his similarly set up motor and it seems to pull just as hard as my truck if not harder.

I want to remove my throttle plate, get a cam ( dont now what is available as far as specs) and get my computer reprogrammed to ditch the emissons.
Who does the best reprogramming for the money?
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Old 09-13-2004, 06:35 PM   #24 (permalink)
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hopefuly TPIJeep will chim in on the vortec head question

here are some links for tuning your 4.3 that I found

http://cybrvanr.tripod.com/intake.htm

I know it is about a van but it has some good info about the larger throttle body from holley. If you click on the picture it will give you the spec's on the throttle body

http://www.cfm-tech.com/gm_tbi_fuel_pressure.htm

This is a good one about tuning the fuel mixture to get the best power from a stock throttle body. I think if you combined the holley throttle body and the adjustable fuel reg. with a K&N filter you would get a noticable power differance
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Old 09-13-2004, 06:52 PM   #25 (permalink)
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We used the Edelbrock performer intake and redrilled the heads to accept the older non vortec bolt pattern. You can use your factory intake and just have the heads redrilled. The Stock TB should be fine, like I said 375 cfm is more then enough flow for a streetable 4.3.

Good Luck
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