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  #16  
Old 03-20-2008, 04:20 AM
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Quote:
Originally Posted by ascalise View Post
Not so, the infamous gm 5.7L diesel was a factory converted 5.7L olds gasser. The blocks were the same. They were junk! We had 3 in the family. In fact, a mechanic friend of the family converted a 5.7L diesel BACK to a 5.7L gasser. Stay away from them! 6.2's and 6.5's were decent if they were maintained. Unfortunately, GM only offered the junk 5.7 olds diesel in the passenger cars. The others were only offered in trucks and suburbans.
It is the misconception that the blocks were exactly the same as the gassers. They came from the same family tree, but in reality they were a beefer engine block compared to the same 350 gas model, with the addition they had big block sized main crank journal and on top of that had diesel specific heads.

Back in the early nineties when I was into hot rodding, I helped my friend build a 400 plus cubic inch small block gas motor using a 350 diesel block, a gasser 425 steel crank and some custom pistons. That was a fun motor, but looking back probably a waste of time. We could just dropped in a 455 in his Cutlass and called it good.

As far as being a diesel, I would consider it a good runner if it was taken care of by a competent mechanic.
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Last edited by DeliveryValve; 03-20-2008 at 04:28 AM.
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  #17  
Old 03-20-2008, 04:21 AM
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wow I've never seen such strong feelings of hatred elicited towards any car...
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  #18  
Old 03-20-2008, 04:23 AM
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Originally Posted by thesst View Post
wow I've never seen such strong feelings of hatred elicited towards any car...
Maybe you should get it just to tick people off! Flame suit on!
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  #19  
Old 03-20-2008, 04:39 AM
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well if he takes my $500 offer then no amount of abhorrence from others will make me turn down a running diesel of any type...
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  #20  
Old 03-20-2008, 05:24 AM
ForcedInduction
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Originally Posted by ascalise View Post
Not so, the infamous gm 5.7L diesel was a factory converted 5.7L olds gasser. The blocks were the same.
Not so, the 5.7L diesel was PURE DIESEL. It only shared cosmetic parts with the g@s engines.

Quote:
In fact, a mechanic friend of the family converted a 5.7L diesel BACK to a 5.7L gasser
That was popular because of the Diesel's 4 bolt main, strong block and crank.

I'll say it again, they were NOT converted g@ssers!
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  #21  
Old 03-20-2008, 06:08 AM
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$500 paid. Then it needed this and that. Now we are up to $950. Engine messes up and now we have a beautiful boat ancher.

What would be cool and maybe a lot of work is to stick a 6.5TD or even a Ford 7.3 in it.

The back end is so sexy. It's like assless.
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  #22  
Old 03-20-2008, 06:13 AM
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When GM went to build that 5.7 diesel it was a rush job. It was the late 70's and we had just had our 2nd "oil crisis". They took the drawings from the olds and based a diesel engine on those drawings.

You have to remember, if you are an automaker, it isn't like you are working in a local engine shop doing custom work. If you want to build an engine with a completely new design you have to spend lots and lots of money on facilities and production machinery in order to build it in production quantities.

If you base an engine around an established design you drastically cut down expenses AND lead time before you can get the damn thing into production

Everyone was freaked out at the time with the price of gas approching $1 a gallon. The market for an American made Diesel car was good. GM rushed into the market with the best thing they could come up with on such short notice.

They rolled the dice and lost big time. And in the process they set the US market acceptance for a Diesel powered automobile back 30 years.



They were hard to keep head gaskets in. That was what was wrong with them. Just not enough meat in the area or enough bolts holding it down.

Buy it for 500. It has to be worth about 10 cents a pound in todays scrap market. If it runs for a year you will be way ahead of the game
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  #23  
Old 03-20-2008, 06:18 AM
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Quote:
Originally Posted by asnowsquall View Post
$500 paid. Then it needed this and that. Now we are up to $950. Engine messes up and now we have a beautiful boat ancher.

What would be cool and maybe a lot of work is to stick a 6.5TD or even a Ford 7.3 in it.

The back end is so sexy. It's like assless.
I guess my timing was a little late on the last post.

Keep in mind an Olds 350 to 455 along with a Buick or Pontiac will go in one of those without too much problem.
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  #24  
Old 03-20-2008, 06:58 AM
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I had a 1980 olds 98 with the 5.7, it was very good,getting 17mpg in the city and sometimes hitting 28,29 mpg on the highway, not bad for 4300lbs.
It was very good in respect to smoothness and noise. You are looking at a 1984 which had many up grades and was better than my earlier model.
The only thing you may have a problem with is you may have problems finding the injectors or parts for the injectors which were specially made for the olds diesels.
Also, injector timing is very important ,and do not pay attention to those factory timing marks, you need a timing device to set timing to 4deg and check every year.
When the timing was set on my olds, and everything was in good order, it always started and ran great.

Good luck

Peter
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  #25  
Old 03-20-2008, 07:50 AM
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I had an 82 Buick Riveria with the diesel that wouldn't get out of its own way. I bought it with blown head gaskets and found out the heads were cracked. Found out almost all of them were cracked but didn't cause any problems. I replaced the head gaskets and the car started every time but had no power. The 260, 350 and 403 blocks were all the same as the diesel, just different bores and cranks. I replaced the diesel with a 403 from a trans am. The 403 fit perfect with no modifications except rerouting 1 wire from the injection pump to the distributor. Fuel lines fit, exhaust fit, stock 403 motor mounts fit. Cleaned Fuel system and was riding. The only problem I had with the care after the conversion was breaking front axles because of the torque of the 403.
Later I had a 83(?) Cutlass V6 diesel which served me well. It was basically the same engine with 2 less cylinders but had been refined and gave great service. It even had plenty of power. Both engines had the same injection pump design which needed rebuilds about every 100K.
I personally would run from one with the 350 diesel or just plan on replacing it as soon as you get it.

Paul
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  #26  
Old 03-20-2008, 08:05 AM
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GO FOR IT. Having owned a 1981 Caprice Classic Diesel for a awhile I loved those cars. I dont think it was as much the engineering as it was the people that bought them didnt know how to care for them. Most bought the diesels because of the oil crisis, and didnt maintain properly. I think there may have been some weaknesses but overall I didnt have any trouble with mine. It burned some oil, but started every morning even in winter without being plugged in.
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  #27  
Old 03-20-2008, 08:15 AM
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But then....

GM has build more cars that run crappy, but continue to run, than most car companies have built cars. Maybe you will get a good one.

Regards

Run-Em
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  #28  
Old 03-20-2008, 08:55 AM
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the 350 was NOT a converted gas engine,it was however based on the 350,the blocks were thicker in the cylinders,and had more nickel,the first ones were the D blocks(78-80)they had issues with breaking crankshafts,and taking out the camshafts,and headgaskets.the later blocks were the DX they cured alot of the early problems,better crank,roller cam,and different heads and intake.most of the issues with them came from poor quality fuel,consensus seems to be that they would get too much fuel injected into the cyls thus raising pressures,this it turn would stretch the headbolts.and i would say that 90 % of the ones i pulled apart had broken headbolts and most of them were the bottom bolt between the middle cyls.we have 7 or 8 of em and 2 still have the original headgaskets,the rest are on their second set,also the pumps would develop leaks over time.if you go to look at it,look right next to where the oil fill tube is,there should be a block number there with that big DX also pull the air cleaner and look at the top of the pump the top cover is held on with 3 screws,underneath the front screw should be a little tag if it says E thats the good pump with the nickel internals.if you want to make one run use the early 78-80 heads with the pencil injectors,and the early DX blocks.we had a 78 that broke a crank under warrenty and they replaced the short block only.that car was a tire smokin beast after that.and those cads were fwd the trans was basically a th200 setup for fwd they called it a th325 if i remember correctly.they should get ya 25-30 mpgs.
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  #29  
Old 03-20-2008, 09:00 AM
ForcedInduction
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Wow, anyone care to donate some punctuation, capitalization and spaces?

The 350 Diesel shares the same designs with the 350 g@sser as the OM61x shares with it's g@sser brothers, cosmetics only. Just because they are both reciprocating piston engines with cylinder blocks does not mean they are the same or one based on the other.

I say the OM61x engines are converted g@ssers because they look like an M130.



Last edited by ForcedInduction; 03-20-2008 at 09:10 AM.
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  #30  
Old 03-20-2008, 09:08 AM
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Originally Posted by Craig View Post
I just realized you are talking about one of these:



The only person I every knew who owned one of those was some second-rate wanna-be mobster in providence, RI.
I always thought those things looked not unlike a cockroach...
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