any information would help. 1970 cutlass supreme
#1
any information would help. 1970 cutlass supreme
i have had some local oldsmobile guys in my area give me some information on my vehicle, but looking to find more. From what i have gathered, they only made 396 of these factory builds from 1964-1972.
1970 Cutlass Supreme 70k miles
factory build:
350 4 barrel
4 speed MANUAL transmission
bucket seats
12 bolt posi
dual exhaust
mag wheels
any additional help would help.. i am also thinking about selling the car, any values would help, thank you!
you can email me at: bjradovich@gmail.com
1970 Cutlass Supreme 70k miles
factory build:
350 4 barrel
4 speed MANUAL transmission
bucket seats
12 bolt posi
dual exhaust
mag wheels
any additional help would help.. i am also thinking about selling the car, any values would help, thank you!
you can email me at: bjradovich@gmail.com
#4
Pretty car. The L74 310 HP 350 4bbl was the standard engine that came in the Cutlass Supreme in 1970. Base trans was a column shifted 3spd manual, but your 4spd was an available option that is pretty rare. As you might imagine, most got the optional automatic. The styled steel wheels are SuperStock I wheels, also an available option. The rear axle may have 12 bolts on the cover, but it is not the normal Chevy 12-bolt. That is a Type O axle used under all 1970 Cutlii and unique to Oldsmobile. It shares nothing with the Chevy axle and actually only has an 8.5" ring gear held to the carrier with ten bolts. A real 12-bolt has an 8.875" ring gear held with twelve bolts.
Good luck with the car.
Good luck with the car.
#7
#8
a guy i found on a forum, had a letter from oldsmosbile, his dad had the same build as mine, and he sent me a screen shot of it, and it stated on there, from oldsmobile, there were on 396 of them made from 1964-1972.. if i remember correctly, the 4 speed is the M20, ill have to check again..
#9
The Cutlass Supreme was not available in 1964, so there's something about your characterization that's not quite right. Would be interested in knowing exactly what the letter says.
Anyway, I have numbers from the GM Heritage Center.....but only through June 1970; July is missing. Tell me the tranny and I'll give you a ballpark how many were built among all Cutlass Supremes, but for now 679 M20s were built among all Cutlass Supreme body styles through June. I'd venture to guess just over 700 were built in total.
M21 numbers are less than a third of that.
Anyway, I have numbers from the GM Heritage Center.....but only through June 1970; July is missing. Tell me the tranny and I'll give you a ballpark how many were built among all Cutlass Supremes, but for now 679 M20s were built among all Cutlass Supreme body styles through June. I'd venture to guess just over 700 were built in total.
M21 numbers are less than a third of that.
#11
Build sheet, I reckon.
A rule of thumb is the rear gears will determine what tranny it has. I'd have to look at the chart to see but if it has AC, it's prob M20; lower gears would get M21, but I don't know where that cusp is.
A rule of thumb is the rear gears will determine what tranny it has. I'd have to look at the chart to see but if it has AC, it's prob M20; lower gears would get M21, but I don't know where that cusp is.
#16
LOVE your car. Original code 19 black?
Best info I can give you so far is from a 1982 letter from Helen Earley: 71 1970 Supreme convertibles were built with the M-21. Hardtops and M-20s can't be much more widespread than that.
Also, the 396 number is for 1971 Supremes and came from Bill VanLuven at the GM Heritage Center in 2004. Not sure if it is for hardtops and/or convertibles or if it includes M-20 and/or M-21s.
I'll see what else I can find in my V Code archives....
Terry
Best info I can give you so far is from a 1982 letter from Helen Earley: 71 1970 Supreme convertibles were built with the M-21. Hardtops and M-20s can't be much more widespread than that.
Also, the 396 number is for 1971 Supremes and came from Bill VanLuven at the GM Heritage Center in 2004. Not sure if it is for hardtops and/or convertibles or if it includes M-20 and/or M-21s.
I'll see what else I can find in my V Code archives....
Terry
Last edited by vette442; August 15th, 2016 at 12:13 PM.
#17
And yes, since A/C required a 3.23 or lower numerical axle ratio, that's an M20. The M21 required 3.42 or 3.91 and thus could not be ordered with A/C.
#19
The number thru June 1971 is actually 394 M-20s in all 4200 series Supremes (hardtops and convertibles). All of these were 350 cars. (No 455/M20s in standard Supremes until 1972's V Codes). 394 was 0.6% of production.
No M-21s were installed in 4200 series Supremes in 1971.
I wish I had exact numbers for 1970 but your car is rare.
Terry
#20
Terry, didn't see your previous post till now.
It's interesting about the email from 2004 because, when I went to the GMHC with Kurt several years ago, they were missing all the July pages for 1967 and 70-72. By a stroke of luck, we found July '71 in the wrong place, but didn't have any luck finding the rest. I will have to ask my contact if he knows this gentleman because clearly something happened between 2004 and, let's say, 2011.
So I have the July 1971 page for M20 and it shows 396 for series 4200. And, indeed, production through June 1971 was 394.
I've never seen anything that would derive an option by body style. Helen must have been looking at something, but it's not anything I've seen at the GMHC.
It's interesting about the email from 2004 because, when I went to the GMHC with Kurt several years ago, they were missing all the July pages for 1967 and 70-72. By a stroke of luck, we found July '71 in the wrong place, but didn't have any luck finding the rest. I will have to ask my contact if he knows this gentleman because clearly something happened between 2004 and, let's say, 2011.
So I have the July 1971 page for M20 and it shows 396 for series 4200. And, indeed, production through June 1971 was 394.
I've never seen anything that would derive an option by body style. Helen must have been looking at something, but it's not anything I've seen at the GMHC.
#22
Please keep in mind that the 0.6% is for 1971 M20 Cutlass Supremes. That's an aggregate that can't be divided by body style - it's for total production, which was 396, plus I imagine a standard rate of error, but I could be wrong about that.
For 1970, the percentage for M20 is 0.9% and M21 is 0.3%. That's through June 1970. We currently have no way of knowing how many more were built in July. All you have is a rule of thumb but, remember, this is for all Cutlass Supremes and can't be applied by body style - to do so would be statistically incorrect.
For 1970, the percentage for M20 is 0.9% and M21 is 0.3%. That's through June 1970. We currently have no way of knowing how many more were built in July. All you have is a rule of thumb but, remember, this is for all Cutlass Supremes and can't be applied by body style - to do so would be statistically incorrect.
#23
There is a little rust on the bottom two inches of the quarter panels and bottom inch of the fenders. Should I leave it original? I ordered quarter panel skins and fender patch panels. I was gonna have a guy fix them and paint the entire body (keeping the original color of course). Or is that a waste of money? Thank you
#24
There is a little rust on the bottom two inches of the quarter panels and bottom inch of the fenders. Should I leave it original? I ordered quarter panel skins and fender patch panels. I was gonna have a guy fix them and paint the entire body (keeping the original color of course). Or is that a waste of money? Thank you
Last edited by csouth; August 16th, 2016 at 12:02 PM.
#26
Sharp car. Definitely leave it as original as possible. Any parts removed for any reason and not reused should be stored. In other words dont turn in the cores if you need a water pump starter etc...That assumes those parts are OEM to the car. If you do the rust repair make sure its done 100% correctly. There is many body butchers out there. Or leave it alone for a professional restorer to do.
Whats the under carriage look like? Where was the car purchased? Where did it originate from?
As for pricing it would not be in 70K miles 442 4 speed territory. It all depends on condition, originality and lack of rust. Snap a bunch of detailed pics of the under carriage, inside the trunk with the mat removed, door seams and metal portions of the front and rear dash, (Also include the rust you described). If these areas are clean you have a real good car and should get the higher end of the dollar scale. Look up the going rate for a 70 Cutlass. Add 10% for 4 speed and 5% for the rare Code 19 paint. I would be comfortable comparing this to a code 19, 70 SX from a price point give or take few thou.
Whats the under carriage look like? Where was the car purchased? Where did it originate from?
As for pricing it would not be in 70K miles 442 4 speed territory. It all depends on condition, originality and lack of rust. Snap a bunch of detailed pics of the under carriage, inside the trunk with the mat removed, door seams and metal portions of the front and rear dash, (Also include the rust you described). If these areas are clean you have a real good car and should get the higher end of the dollar scale. Look up the going rate for a 70 Cutlass. Add 10% for 4 speed and 5% for the rare Code 19 paint. I would be comfortable comparing this to a code 19, 70 SX from a price point give or take few thou.
#27
#28
The car has been garage kept in Minnesota its entire life. Duluth Mn to be exact. I will attach some pics of the trunk and under carriage. Once again, nothing has been touched on this car. There is a little surface rust on the under side, but I think a wire brush will remove a lot of it, I just don't want to touch it until I know what the correct thing to do is.
#32
Does it have a rear sway bar? If so the rear lower control arms are "boxed" and not just an open C channel. Rallye pack is the gauge package...tac clock combo, oil temp gauges verses idiot lights.
This looks like a solid car so far.
This looks like a solid car so far.
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