Motor needs to be replaced, need help!!!!!!

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arb905

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I took my Kon to a shop to get the intake manifold gaskets replaced. After getting it back from the shop, it developed a noticeable low end knock. Took it back to the shop to have it checked and it lost all oil pressure at idle and wouldn't get above 20psi. Shop put a manual gauge on it to confirm. Bearings are bad and motor needs to be replaced/rebuilt.

I put this in so all are aware of how I got to this point. I have the mechanical ability to do just about anything. What I don't always have is the time, which is why I took it to a shop to get the gaskets replaced.

Now that my Kon is down, I intend to make the time necessary to get it rebuilt /replaced cheap. What I am looking for are some ideas that fit within a short budget. I have several options before me and I'd like some help with making a decision. Right now I am not in the position to have the computer retuned because I won't be able to do everything I'd like to do to my Kon. So they need to be compatible with the stock tune. I intend to replace the spider injectors and put the vmax spacer in.

I can top my budget by going with a high quality rebuilt motor. Or I can get the motor rebuilt, a local machine shop quoted $1750 to do a complete rebuild. I have a local mechanic that does side work that is getting me a price to rebuild, he has suggested doing some minor milling to the heads to do a slight raise to compression, install a mild RV cam, roller tip rockers (1.5 intake, 1.6 exhaust). I may also take the time to find some inexpensive mid length headears and do some exhaust work.

I would say my budget would be in the 2500-3500 range, all depends on the time frame it takes to get it back together.

Please help me with some good ideas on what I can do to get a better running and more powerful truck without exceeding the stock computers capacity. Thank you.

Just took a look at BBP for a tune. I may go with a tune as long as it fits within my listed budget.
 
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bowtiefreak

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A new L31 (350 vortec with 4 bolt main) is about $2,100. BUT a rebuild can be fun because3 you can upgrade a few things. The catch with a rebuild is that the truck is down while they work on it ulsess you find a dirt cheap spare motor to get worked on
 
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arb905

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As luck would have it, I do have a spare long block out of a similar vehicle. Doesn't really matter because there is no oil pressure and it knocks. So the Kon is down until motor is rebuilt or replaced. I saw the replacement motor you speak of but have been looking into the 383 blocks too. Found some inexpensive long blocks and have heard rumor they will work fine with the factory computer. Just won't get the full performance until computer is tuned. Anyone heard if this is true?

I'm a power junkie and wasn't prepared to start this so soon. Had big plans, now I need to plan carefully so I don't replicate parts I intend to replace later.
 

bowtiefreak

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I just so happen to run a HT383E in mine. It ran fine without a tune but rean much better with a tune. If it is a mild 383, chances are you might have enough fuel with the stock delivery system.
 

stuntmanray385

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As luck would have it, I do have a spare long block out of a similar vehicle. Doesn't really matter because there is no oil pressure and it knocks. So the Kon is down until motor is rebuilt or replaced. I saw the replacement motor you speak of but have been looking into the 383 blocks too. Found some inexpensive long blocks and have heard rumor they will work fine with the factory computer. Just won't get the full performance until computer is tuned. Anyone heard if this is true?

I'm a power junkie and wasn't prepared to start this so soon. Had big plans, now I need to plan carefully so I don't replicate parts I intend to replace later.

i had the exact same issue. knock and no oil pressure. i got my motor rebuilt and stroked it to a 385 (.40 over & 3.75 stroke). added a race cam 281duration with .512 lisft so far im only at about 200 mi on the new engine. feels pretty good. everything is pretty much stock except for msd dist, coil wires and 6al. also i removed the resistor plate from the tb. im spinning tires before 3000rpm.. haven't been able to get its full potential because the motor isn't fully broken in but other than upgrading to a lq4 or something a 383 would be the way to go. i will be defiantly be getting a bb tune in temecula next week! cant wait!
 

jwindh1

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I wouldn't do anything outside of stock, other than exhaust and air induction, without at least getting a mail order tune. I've seen too many cases of "mild cam and head" upgrades and such with no tune, run lean and fry.

My advice is to do whatever it is that you can do and have it properly tuned. You more than likely do not know when you will get back into the motor again to make changes. When you make additional changes later on, tune it again. It doesn't make sense to me to put money into performance upgrades and then not make sure that they are functioning properly and that you are getting your full moneys worth.

I installed a set of worked heads and custom cut "mild" cam into my LT1 powered Nova. All the "experts" out there said those upgrades are within the stock tune setting and you will be fine. Of course, I had no intention of not having it dyno tuned anyway. But, first pull before making adjustments made 298rwhp and the car was running SUPER rich. At the end of the tune it turned 329.8rwhp. It is also a conservative tune.
http://www.youtube.com/watch?v=Ph2KIJh0ih8
 
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arb905

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Nice Nova. Since the Kon took a dump the money doesn't get to be used on my Nova. So if I can't get to make the Nova scream the Kon will.

Looking at the 383 option and will do the tune. Didn't realize how affordable BBP tune was.
 

jwindh1

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Nice Nova. Since the Kon took a dump the money doesn't get to be used on my Nova. So if I can't get to make the Nova scream the Kon will.

Looking at the 383 option and will do the tune. Didn't realize how affordable BBP tune was.

Good Decision all the way around, especially on incorporating the tune.
 

Ironman1979

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Ok, what I recommend is contacting Herb at (281) 546-6232 or [email protected] and price his Vortec 383 which makes 340hp and 420lbs of torque with a powerband that runs really well with a 4x4. he quoted me 2800 for built 383 shipped to kansas city it is ready to drop in with your tins and accessories. it also responds really well to a tune and headers which i found on summit for 135 collectors with o2 sensor bungs for 35.
 
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arb905

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Well guys thanks for the advice. The 1/2 made the decision for me and set up a Jasper replacement 350. Can't really complain but I will. The Kon will never see the 383 since this motor will outlast the truck. Right now I'm getting parts together to make the swap.

Headed tot he store to get beer and BBQ to feed the free help coming to pull the old motor. New motor will be here on Wednesday or Thursday.

I'll make the best of it by installing a new spider assembly. Going to plan on headers and a new exhast system soon. Also looking into the efan swap. Not sure what else I will do to it may fab up a sweet intake system or go old school and make a drop base round filter assembly, to fit the custom hood scoop in the future. After all that I'll look at doing the tune so everything is kosher.
 

Ironman1979

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:bawl: me wants to see you with a 383.. but im all for the beer and bbq.. gonna have to do that soon my self whit my kon... but i dont have many friends.. so i will probably be drinking and eating looking at it like damn.. this is gonna suck..
 

SunlitComet

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Still A very good decision. I want a 383 myself if I had the money But I have to live with the fact that although I have federal emissions, I am currently in Cali. And may stay in Cali where the GM-performance engine is off limits here.
 

sparg93

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Ironman - does Herb own his own shop? New or rebuilt?

On to transmission, do you think my '99 OBS trans can handle that amount of torque?
 

SunlitComet

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basic 4l60e is supposed to rated at a maximum of 350lbs at tranny input. so you may wear it out sooner if abused above that continuously but a built up unit would last longer and would handle more.
 

LEBROND

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I took my Kon to a shop to get the intake manifold gaskets replaced. After getting it back from the shop, it developed a noticeable low end knock. Took it back to the shop to have it checked and it lost all oil pressure at idle and wouldn't get above 20psi. Shop put a manual gauge on it to confirm. Bearings are bad and motor needs to be replaced/rebuilt.

I put this in so all are aware of how I got to this point. I have the mechanical ability to do just about anything. What I don't always have is the time, which is why I took it to a shop to get the gaskets replaced.

Now that my Kon is down, I intend to make the time necessary to get it rebuilt /replaced cheap. What I am looking for are some ideas that fit within a short budget. I have several options before me and I'd like some help with making a decision. Right now I am not in the position to have the computer retuned because I won't be able to do everything I'd like to do to my Kon. So they need to be compatible with the stock tune. I intend to replace the spider injectors and put the vmax spacer in.

I can top my budget by going with a high quality rebuilt motor. Or I can get the motor rebuilt, a local machine shop quoted $1750 to do a complete rebuild. I have a local mechanic that does side work that is getting me a price to rebuild, he has suggested doing some minor milling to the heads to do a slight raise to compression, install a mild RV cam, roller tip rockers (1.5 intake, 1.6 exhaust). I may also take the time to find some inexpensive mid length headears and do some exhaust work.

I would say my budget would be in the 2500-3500 range, all depends on the time frame it takes to get it back together.

Please help me with some good ideas on what I can do to get a better running and more powerful truck without exceeding the stock computers capacity. Thank you.

Just took a look at BBP for a tune. I may go with a tune as long as it fits within my listed budget.


Man,I'm having the same issue with my Tahoe @ 205k slight rod knock up and at times very low oil pressure;All the shops are just talking crazy anywhere from 3k to 6k to rebuild which is horrible.I found a place called Fairway Motor Exchange and for the exchange the total will be $2750 for a reman motor and 3 yr warranty that's like the cheapest I have heard period I don't what to do
 

stuntmanray385

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Still A very good decision. I want a 383 myself if I had the money But I have to live with the fact that although I have federal emissions, I am currently in Cali. And may stay in Cali where the GM-performance engine is off limits here.

im in los angeles and if you have you have your vortec stroked and make sure the cam is ground to work with the cpu it will pass smog. mine did no problem. legal smog btw!
 

SunlitComet

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good to hear. Will keep that in mind. One day I would like to buy and install the ht383e crate from gm but I have to do a lot of research on how well it will do in emissions test measurements. GM says the e-version is emissions legal just not in handful of states.
 
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arb905

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My wife found a guy a few months ago to get some quotes to fix her '67 Camaro. Just so happens when she told him about the Kon, he came to our rescue. He said he had a good friend that is a Jasper dealer. His friend sold us a motor that is the direct replacement for the Kon. I got it for under $2500. I also happen to have a few good connections and some friends came to help wrestle the motor from between the framerails. Right now both motors are sitting on engine stands next to each other and the process of swapping accessories begins.

---------- Post added at 05:38 PM ---------- Previous post was at 05:35 PM ----------

I'm also looking at Doug Thorley tri-y headers for the Kon. It appears to be the headers come with the down pipe to route it to a converter. Looks like the best price is around $700. I like their design better than the others. I'd prefer to had a mid length headers instead of the long or short ones.
 

bowtiefreak

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A brand new L31 (vortec 350 is only about 2200) basicall teh same as a rebuilt jasper. I am going with a new chevy L31 for the suburban
 

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