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View Full Version : How do you identify what year the block/Olds 350 is?


Absolut87
12-15-2002, 10:41 PM
I recently purchased an Olds 350 Rocket from a guy. It's been completely rebuilt, the guy did a wonderful job! When I asked him, he said that the block(Olds 350 engine) is a 1984 block. Now, correct me if I'm wrong, but weren't the only 350 engines in '84, diesel?? Please correct me if I'm wrong, but he said it was an Olds 350 rocket from a 1984. When I told him that I thought only 350's that came from '84 were diesels, he said it wasn't a diesel but an Olds 350 Rocket. (Sorry if I keep repeating myself!) When I asked him again what the year was, he told me it came out of a '84 Olds 98. Were Olds 350 Rockets stock in Olds 98's? What classifies an Olds 350 as a "Rocket"?? How would I find out what year this engine really is? Is there somewhere on the engine block that will let me know what year this is, and in fact if it is an Olds 350 Rocket??

Thanks, ~Andy

foureverolds8
12-15-2002, 11:25 PM
According to my book YES the 350 could have been a 1984
ROCKET= a name that Oldsmobile labeled their V8 all of them.
The yr= locate the carb number, head numbers,intake numbers,and block numbers. That will get you closer the finding out the yr.
and in fact if it is an Olds 350 Rocket?? yes it is ,.................. but I assume that you might be referring to the hi comp 350?!?!?!.

H/O W40
12-16-2002, 06:57 AM
Once a again, the work rocket refers to an old advertising term and means nothing. If the 0lds faq is correct they stopped making 350's in 1980. I bet you have a 307! Are you sure it's an olds. I think 98's could have had a 350 Chevy. Tell us the head #'s is it 5a? Look at the side of the block, the cid will be stamped down by the oil pan.

Karlb
12-16-2002, 12:21 PM
Being an Olds with Over-Head Valves makes a motor a Rocket.

don71
12-16-2002, 03:56 PM
In order to find the year of the block, you need to find a small machined pad on the drivers side. It is located just below the head and near the front . Usually the power stearing pump and bracket is in the way to see it clearly.
If you find the spot, There should be some numbers stamped on it. It should look like this, 3M0000000( nine digits. )
3 means olds -M means Lansing Mich. X would mean kansas city, the assembly plant and so on. The third number will be the year. In your case it should be 4- for 1984. The other numbers should match the VIN from the car the motor came from.
If there is doubt on which brand of motor is, an olds will have 5 or 10 bolts on each valve cover. If it has 4 bolts, its a chevy. Oh and don't forget that big ole honking oil fill tube......if it has one its probably and olds.

Absolut87
12-17-2002, 09:32 AM
thanks for the help Don71! What would the third digit be if it's pre-1980?

don71
12-17-2002, 04:58 PM
It just repeats......4 could be 74 or 84 ........0 could be 70 or 80. As posted above the carb number and other casting numbers can narrow it down pretty close. Then you can feel confident at what you really have.
there is another post here in RWD tech , just recently on how to identify these blocks.

Absolut87
12-22-2002, 12:02 AM
What years and models did the Olds 350 come in???? What my delemna is (the reason why I was wondering what year my engine is..) is when looking for parts, lets say oil filter and other accessories for the engine, do you need to know the year of the Olds 350 or are all parts/accessories the same for all the Olds 350's, regardless of the year????

Ryan Michelotti
12-22-2002, 08:26 AM
NO GASOLINE 350's in 1984......ONLY DIESEL

I'm willing to bet you have a 307.

I hope you didn't pay too much.

What heads are on there? 1984 307's should have 5A heads.

Ryan

Ryan Michelotti
12-22-2002, 08:28 AM
Also, next to the Oil Fill Tube, in front of the intake, behind the water pump/timing plate. There is a number cast into the engine, WHAT IS IT? That will DEFINITLY tell us what it is.

Ryan

Absolut87
12-22-2002, 05:56 PM
Thanks Ryan, but I don't believe it's a 307. The guy only claimed it was a 1984 Olds Rocket 350 because it came out of a 1984 Olds 98. He did completely rebuild a 350 because he knows the difference between a 307 and 350! He wasn't for sure what year Olds 350 was put in the 1984 Olds 98.


Originally posted by Ryan Michelotti
NO GASOLINE 350's in 1984......ONLY DIESEL

I'm willing to bet you have a 307.

I hope you didn't pay too much.

What heads are on there? 1984 307's should have 5A heads.

Ryan

H/O W40
12-22-2002, 07:03 PM
Originally posted by Absolut87
He did completely rebuild a 350 because he knows the difference between a 307 and 350! He wasn't for sure what year Olds 350 was put in the 1984 Olds 98.




What are the head numbers? Does the block have 350 cast on the side of the block. It may not be a 350.

foureverolds8
12-22-2002, 07:47 PM
Been a week now and Absolut87 has came up with no numbers. The guy only claimed it was a 1984 Olds Rocket 350 because it came out of a 1984 Olds 98. People do lie?!?!

WE CAN NOT GUESS AS TO WHAT YR THIS ENGINE IN QUESTION IS WITHOUT NUMBERS.......... WE NEED NUMBERS.:rolleyes: :rolleyes:

ROLLY'S ROYCE
12-22-2002, 08:17 PM
I learned the hard way, not that I thought I had a 350, but the opposite....I thought it was a 307 because of what the engine label "said" was in the car....not thinking that anyone might have switched power plants somewhere over the course of 20 years it took a broken solonoid on the starter and new "307" solonoid that didn't fit and a few scratches of the head saying what the ...$&#^ is happening...then a quick look at the side of the block to see and feel the BIG 350

Rolly

Ryan Michelotti
12-22-2002, 09:03 PM
THERE IS NO SUCH THING AS A "1984 Olds Rocket 350"

Only "Rocket" offered in 1984 was the aptly named Bottle Rocket 307.

It very well may have come from a 1984 car, and it very well could have been swapped out for a 350 but the fact of the matter is: The VERY last year for a 350 Rocket was in 1980. PERIOD.

I beleive I know what I'm talking about.

Until you can give us some numbers, instead of defending a guy that may very well be screwing you, we can't help you!

The guy has already lied to you, about either the year, or displacement of the engine, possibly both.

Get the numbers, post them, and we can help you.

Ryan

ROLLY'S ROYCE
12-22-2002, 09:22 PM
Ryan your right the last year for 350 Olds was 1980. Head #'s 3A, I know here is a pic of mine!


Note the Brass plugs to block off the A.I.R. holes for the air polution rig featured on the 350 77-80 Oldsmobile engines!

Cutlass84
12-22-2002, 09:27 PM
Can i borrow that for a while?

ROLLY'S ROYCE
12-22-2002, 09:57 PM
Cutlass 84 That car of yours is just one awsome looking car. I love 'em I use to have an 83 and an 82. The 83 was a Calis, buckets console all gauges....body quit on me up here with all the salt and **** on the roads...I took the motor out and put it in an 82 Cutlass Brougham...it had a 267 with a worn cam youd swear a Chevette had more power ha ha....I sold it to my bud at work had too many Olds'....so says the'ol lady, kept the big 98 still love my Cutlass' though one of the best looking cars ever!

Rolly

PS that motor has over 240,000mi on her
I know it's a 305 Chevy...still the car is an
OOOOOOOOOOOLLLLLLLLLDDDDDDDDSSSS!

Absolut87
12-23-2002, 12:06 PM
Hey, GIVE ME A BREAK, ALRIGHT?! I'm in Michigan right now seeing my other half of my family, and my engine is in IOWA, so ya, I can't really go look at them this second now can I?! I'm just asking questions so I know what to look for when I get home!!!!



Originally posted by foureverolds8
Been a week now and Absolut87 has came up with no numbers. People do lie?!?!

WE CAN NOT GUESS AS TO WHAT YR THIS ENGINE IN QUESTION IS WITHOUT NUMBERS.......... WE NEED NUMBERS.:rolleyes: :rolleyes:

Absolut87
12-23-2002, 12:16 PM
Hey, RELAX!!!!!!!!! I know that the there's no such thing as an '84 Olds 350 Rocket, duh! If you've read what I said, I claimed that the only 350 made in '84 was a Rocket!! Also, I was asking what came in a '84 Olds 98, if it could have been an Olds 350 Rocket, that's all you had to do was say YES or NO! Don't be a jackA**, people are trying to learn and they don't want to when you are unkind! Also, nobody said before you, that the last year a 350 came in was in 1980, you didn't need the smarta** PERIOD comment!!!! The guy also knows what he's talking about! He knows its a 350 but wasn't sure what year it was since it was in a '84 Olds 98! and I'm not defending him! Give me a chance to get back to IOWA and check the numbers! I'm just getting all the information I need so I know what to look for when I get home



Originally posted by Ryan Michelotti
THERE IS NO SUCH THING AS A "1984 Olds Rocket 350"

Only "Rocket" offered in 1984 was the aptly named Bottle Rocket 307.

It very well may have come from a 1984 car, and it very well could have been swapped out for a 350 but the fact of the matter is: The VERY last year for a 350 Rocket was in 1980. PERIOD.

I beleive I know what I'm talking about.

Until you can give us some numbers, instead of defending a guy that may very well be screwing you, we can't help you!

The guy has already lied to you, about either the year, or displacement of the engine, possibly both.

Get the numbers, post them, and we can help you.

Ryan

Absolut87
12-23-2002, 12:21 PM
Sorry, mis-typed sentence. What I meant to type instead of this..
[QUOTE]If you've read what I said, I claimed that the only 350 made in '84 was a Rocket!![QUOTE] ... was "If you've read what I said, I claimed that the only 350 made in '84 was a DIESEL!!

ROLLY'S ROYCE
12-23-2002, 01:00 PM
It's hard on the computer because of the lack tone that you hear in a persons voice, I'm sure there was no harm meant...these guys are just razzin' you thats all they are good guys and know what they are talking about just having a little fun thats all....if you want to learn these are the guys to ask....trust me

Absolut87
12-23-2002, 05:01 PM
Ok guys, I had my dad check the numbers on the block...

The cast # that was next to the oil fill tube, in front of the intake and behind the water pump/timing plate... 39558, (thanks Ryan!).

The intake says "Oldsmobile" right on the Intake. It's # is 411990.

The head #'s, (3a), next to the valve cover is 411929.

The valve covers have 10 bolts on each, so that makes it an Olds engine, Thanks don71!

Ok, now that I HAVE NUMBERS, can you guys tell me what they mean?? The guy at Advance Auto Parts and also at an Oldsmobile dealer said it was a 350 Rocket by the numbers I gave them!

I also want to apologize for lashing out at certain people! It was wrong and I promise never to do that again to my fellow Olds Luvers!

Thanks for all your help,
~Andy

foureverolds8
12-23-2002, 08:03 PM
395558 = 1968-1974 block
411929 = 1973-1976

411990 is listed under the bb olds 400 or 455?!?!
sure its not 411880? if it is then it 1974-1977

taking all this into consideration I would guees it to be a 1973-1974

ALSO when I said "People do lie?!?!" I meant the guy you got it from could have. ANYTHING IS POSSIBLE. I WAS TOLD MY CUTLASS HAD A 403 IN IT WHEN I BOUGHT IT! but its only a 307:( :(

Ryan Michelotti
12-23-2002, 08:46 PM
Yes, I think it's a 73-74 Oldsmobile 350 engine as well.

You can know FOR SURE by checking the stamped number on the block.

As you look at the FRONT of the engine, on the right hand side, there is a flat 'pad' below the head casting #, it will have a engine/VIN number stapmed in it. It will look like this 3M4xxxxxxx

The 3 means Oldsmobile, M means Lansing, Michigan (although there were OTHER plants that they came from, and 4 means 1974
The rest of the numbers are the Vehicle VIN# or sequence number, not sure on that one.

Ryan

foureverolds8
12-23-2002, 09:56 PM
Originally posted by Ryan Michelotti

As you look at the FRONT of the engine, on the right hand side, there is a flat 'pad' below the head casting #, it will have a engine/VIN number stapmed in it. It will look like this 3M4xxxxxxx
The 3 means Oldsmobile, M means Lansing, Michigan (although there were OTHER plants that they came from, and 4 means 1974
The rest of the numbers are the Vehicle VIN# or sequence number, not sure on that one.
Ryan

Ok now this has really bugged me for awhile now.....
heres my numbers... 34D150571
3 means Oldsmobile, M means Lansing, Michigan ?????????????

fe3xl
12-24-2002, 05:35 AM
Originally posted by foureverolds8


Ok now this has really bugged me for awhile now.....
heres my numbers... 34D150571
3 means Oldsmobile, M means Lansing, Michigan ?????????????

Not to step on anyones foot, but according to the Olds FAQ, the block VIN is in the format "ABCXXXXXX", where A is the division (3 means Olds), B is the year (4 could be 1974 or 1984, but I believe it to be 1974, as no gas 350's were used past 1980. C is the Assembly (or casting) plant, and I have no idea what plant D would be. M would be Lansing, B=Baltimore, X=Kansas City, Z=Fremont. "XXXXXX" should be the individual unit number, or serial number. Anybody know what plant "D" would indicate?

don71
12-24-2002, 07:54 AM
ok...we all now know where to find these codes and what they mean. I also can not find what D means. Are you sure it is a D?
I will keep searching for it and post what if any thing I find.
Here are some more letters to add to what we know.
G- Framingham MA
E-Linden NJ
K- leeds plant in kansas city a few miles from the X plant (fairfax plant)
There is a web site that allows you to input your VIN and find info on it. I'm still searching for it.

skeeter88
12-24-2002, 08:07 AM
I believe that D stands for Doraville, GA

Thats where my '76 Salon was builit

foureverolds8
12-24-2002, 10:29 AM
Sorry absolutely87 I didnt mean to start a thread in your thread, but I was curious to the number I came up, that I had not been able to decode.

correct fe3xl a 1974 olds 350 :D according to other numbers I have been able to decode. Its really not too important as to where it was made, but I would like to know, so if you come up with the what the D means, I can add that to the list of what I do know about the engine.

And don71 I am 99.8% it is a D, could be a O though or maybe a B?!?! When ya find that web site I would like to have it too

THANX!!!!!!!!! skeeter88 I will add that to my list :D :D

Karlb
12-24-2002, 12:12 PM
Ryan slipped on the order of the digits, but fe3xl caught it.

Absolut87: Those heads were used on 77+ blocks, and it is unlikely that anyone would take the effort to open the bolt holes on an early block to make them work. The intake should also have a number cast into it by one of the front runners. That would do more for me than the 6 digit number. The block code you gave is missing a number. There should also be a large number cast after the 6 digit blcok number; that number would help.

Foureverolds8: Looks like a 1974 block from the plant skeeter88 listed.

Cutlass84
12-24-2002, 02:47 PM
Originally posted by ROLLY'S ROYCE
Cutlass 84 That car of yours is just one awsome looking car.

Thanks for the kind words Rolly.

-Paul

Rob
12-25-2002, 01:30 AM
Originally posted by Absolut87
Ok guys, I had my dad check the numbers on the block...

The head #'s, (3a), next to the valve cover is 411929.

The valve covers have 10 bolts on each, so that makes it an Olds engine, Thanks don71!

Thanks for all your help,
~Andy

The heads should be number 8 heads, not 3A's. 411929 is the casting numbers from #8 heads. Those should appear just under the center bolt hole in the valve cover on the outside of the heads, which should be visible with the valve cover on. 10 bolt valve covers indicate 76 and earlier heads. I'd guess the heads are original. Look in FRONT OF THE #1 SPARK PLUG and there should be the number 8. Good luck.

Absolut87
12-29-2002, 01:11 PM
Ok, the 9-digit number (stamped # just below driver side head near the front) reads... 35D175301. Can anyone tell me what each number/letter means??

The other numbers are as follows:

*Oldsmobile intake # 411990
*Heads (#8, thanks Rob!) #411929
*I found another number, # 39558, that was in front of the intake on the block.

Karlb
12-29-2002, 01:45 PM
3 - Olds
5 - 1975
D - Doraville plant(GA)
The last six I believe should match the last six digits of the VIN of the car it was originally in.

blackmac03
07-23-2007, 03:53 PM
i just have a question i have a 82 olds cutlass and i just order a 1978 olds motor from advance auto and they sent me a chevy motor which he said was a L type, and to get the right motor he has to order a R type is that what i need a R type motor..or is he just guessing what i need...and do i have to do a lot of changes to make it fit i currently have a olds 307 in it..anybody can help cus i dont know much about engines

svnt442
07-23-2007, 03:56 PM
The R indicates the letter in the VIN of the car. L in the VIN meant chevy and R meant Olds.

scottb
07-23-2007, 04:12 PM
If you get the correct 350 R (Olds) engine it will slide right in with no changes. The Chevy 350 is laid out very differently and would be a more difficult swap, hold out for the Olds engine.