Car of the Week: 1970 Olds Cutlass Supreme

By Brian Earnest

It took about 37 years for his “baby” to officially became full grown, but it was definitely worth the wait for Ken Rinear.

Rinear bought his 1970 Oldsmobile Cutlass Supreme convertible back in 1996. At the time, the car was strictly for kicks, and the Perkasie, Pa., native had no aspirations of doing anything with the car beyond keeping it running and enjoying some top-down cruising in the summertime.

It’s funny how plans change and goals get adjusted when a guy gets infatuated with the car, however. Sixteen years later, Rinear has pretty much reinvented his Olds twice, turning it from a “decent No. 3 driver” to a top AACA award winner, then remaking it again as a biceps-flexing 455 “SX” muscle machine.

Along the way the car has served as the model for a Danbury mint replica, carried Miss America pageant contestants and even gotten its own nickname from the other car guys who know Rinear and his Olds. “Everybody knows it as ‘Baby.’ That’s what it’s called. Everybody calls it that,” Rinear laughs.

Rinear says that handle was hung on the car when he took the Olds to Thornton Classics in Bethlehem, Pa., for some work not long after he bought it. The Thornton shop specializes in high-end muscle machines, particularly Olds 4-4-2s, and there always were a lot of big-block GM cars in the vicinity whenever Rinear was around. “I told them it was the baby brother of all those big-blocks,” he said. Rinear took a lot of razzing about not having a big-block in his Cutlass Supreme, but he was not about to mess with the factory 350 that was still in the car. He had other ideas, and over time they all came to fruition.

“I never planned to do a frame-off restoration, but little by little, I re-did everything,” he says. “I kept doing a little here and there, and then I had a little accident with it and busted it up and had to replace a door and fender, and that’s when I got it stripped and repainted and decided to put everything back together the way it was supposed to be.” That included painting the wheels correctly, putting wide oval tires on the car, replacing the exhaust with the factory correct equipment and detailing the car from top to bottom. Rinear achieved his AACA First Junior award in 2002 and advanced all the way up to Senior Grand National honors in 2006. By that point, the car’s Pearl White interior had been redone, new seat covers, convertible top and door panels were in place, and a working factory 8-track player had been added.

“Everything on the car was pristine,” Rinear said.

The car’s resume continued to grow in 2003 and 2004 when it was selected to carry Miss Michigan and Miss Missouri in the Miss American Pageant Parades in Atlantic City. The pageant has since been moved out of Atlantic City, but Rinear has been able to continue his parade duties in the annual Miss New Jersey parade.

The crowning moment for the car may have come when the Danbury Mint called the Thorntons looking for a 1970 Cutlass to copy. The Thorntons passed along Rinear’s number. “I was in my office in Warminster one day in, I guess, ’05,” he recalled. “I had bought one or two of the Danbury models, and I get a call one day from them and I figure, ‘OK, they’re probably trying to get me to buy a few more models.’ Well, they had gotten the phone number and called Troy Thornton and he told him if they wanted a Cutlass convertible, call Ken. So a lady came over and saw it and a couple weeks later they came and photographed car … They probably spent three or four hours photographing the car and taking video of it and measuring everything. Then when they came out with [the model], it was a limited edition and only 5,000 were made. I didn’t get paid anything, of course, but I got a couple of the models for free. The only bad thing was I had pleaded with them to keep it red, but they had done a 4-4-2 convertible in Rallye Red, so that’s why the made the model Twilight Blue.”

The Rallye Red and  Twilight Blue were among the more than 20 original factory colors that were available on the 1970 Cutlass Supremes, which again occupied the top rung of Oldsmobile’s popular Cutlass lineup.  The Supreme nameplate was introduced in 1966 and for 1970 was built with GM’s A-body and was competing with ever-growing personal luxury car segment.

The Supremes were offered as two- and four-door holiday hardtops and as convertibles. More than 26,000 Supremes were built for the model year, but only 4,867 of those were ragtops, which carried a base price of $3,335.

Unlike some of GM’s other midsize offerings — namely the Monte Carlo and Grand Prix — the Supremes had much in common with the base Cutlass offerings and shared many of the same body and chassis pieces. The most obvious design difference was in the roofline; the Supremes had a notchback profile while the base Cutlass series had a sloping fastback design. Under the hood was a 350-cid four-barrel V-8 that produced 310 hp.

The Supremes were a little fancier inside than their base Cutlass siblings, and buyers could get either Strato bucket seats or a notchback bench in front.

If you wanted to rev up your Cutlass Supreme and impress your friends at the track, you could dial up the “SX” package, which basically turned it into a 4-4-2 in disguise. The Package included the W-32 455-cid, 365-hp big-block, Rallye suspension, cutout rear bumper and a different dual exhaust.

Rinear finally began to warm up to the idea of a big-block when his original engine began having problems after it had turned over 100,000 miles.

“The piston rings on one piston all broke,” he said. “I have a buddy, and he’s not a fan of small-blocks, and he’d say, ‘Look, you’ve got all the awards you can get, it’s time to move up to a big-block.’ So I did all the research on W-32 option, and that’s what I had them do. I always wanted to get a big muscle car so I told him to do it … I don’t call it a clone, I call it an upgrade. I had them take the motor out and put the new motor and correct trans in there… When it was done it was 100 percent factory-correct ‘SX’ W-32.”

The car has a much different personality and feel these days with the jumbo engine. Linear jokes that it’s also a lot thirstier, but he doesn’t seem to mind. It hasn’t stopped him from rolling up 6,000 miles since the 455 was installed. He figures there will be a lot more on the way, too.

“With that Code OG trans — which is a Turbo 400 with a higher stall converter … it has a lot firmer shifts and shifts at a lot higher RPM, so that’s going to affect your mileage,” he said. “Of course, the power is unbelievable … The 8 miles a gallon can be a little tough take. I’d say I went from 13 to 15 mph with the 350 to 8 to 10 with the big-block. But if I’m only driving 2,500 miles a year, ah, I just budget a 1,000 bucks a year for gas. I don’t worry about it!”

At this point, after years of tinkering and upgrading the Cutlass Supreme, Rinear admits there isn’t much left he can do. He’s thought about putting a dual-gate shifter in it, but he’s not sure. “Maybe I will, maybe I won’t,” he concluded. “Most of the time, I just put it in drive and just cruise.”

The idea of ever parting with the Olds and possibly starting over with a new car isn’t particularly appealing, Rinear says. Car and driver long ago formed a bond that’s pretty close to permanent.

“People would think I’m was crazy if I ever sold it,” he said. “It’s a part of my life. It’s a part of my family. And the car’s got personality. The only time it ever acts up is if I start talking about selling it!”


Related Story:

Another great 1970 Cutlass Supreme


If you don’t subscribe to , you’re missing out on the only weekly magazine in the car hobby. And we’ll deliver 54 issues a year right to your mailbox every week for less than the price of a oil change! Click here to see what you’re missing with !


Got a car you’d like us to feature as our “Car of the Week“? We want to hear from you! E-mail us and tell us all about it.


Muscle Cars — Inside & Out

Need to do some homework on a muscle car? Check out this great package — three resources in one package from the publishers of Firsatsaatleri.

7 thoughts on “Car of the Week: 1970 Olds Cutlass Supreme

  1. Charlie Self

    Great car! I hope those wide oval tires are longer lived than the ones on the ’68 Barracuda 340S I used to own. Eight thousand miles was about the maximum then…in ’68 and ’69.

    1. Ken Rinear

      It became a running joke at the shop. But when I had them do the upgrade I did all my homework on the “SX” W-32 option to insure that everything was factory correct. (In fact I have to correct one minor visible mistake that only the true Olds guys would recognize. Not a big deal.) Now it is a high powered muscle machine.

  2. Dan

    I am a dyed in the wool Olds man, but, it’s a clone, and not all ’70 Sx’s were W32’s, in fact very few were, until Febuary of 1970 they were two bbl equipped, then changing over to the 4 bbl for the remainder of the year, plus the whole of the 1971 run of SX’s.

    1. Ken Rinear

      I did not represent it as an original car. As I stated to the writer, I do not call it a CLONE! (My priviledge.) It is an authentic upgrade. Correct motor, correct OG trans and all Oldsmobile. The original SX option was the L-33 with a 455-2V and an OD trans then they upgraded it to the L-31 with a 455-4V and an OD trans, (Delta powertrain). As for the W-32 option, that was available for the entire model year; 455-4V 442 engine with OG 442 TH400 automatic trans. This is exactly how I did the upgrade. All engine, transmission, electrics, suspension and appearance items were correctly installed. As far as the 1971 model year is concerned there was no longer a W-32 but was a 455-4V with an OD trans. (The standard Delta powertrain.)

  3. Andrew AKA drcutlass

    Hey Ken,,The only information I have about the Cutlass SX, I read in the book “The Cars Of Oldsmobile” by Denise Castille. I was always surprised that the SX only had a 2bbl,,now you’re letting me know that there was actually a change to it,, to a 4bbl in the same model year,,,I did not know that,,very cool,,you seem to really have done your homework and you know what you’re talking about.
    I have an all original (except paint job) un-restored,,,un-molested,,1970 Cutlass Supreme in near perfect condition parked in my garage next to my fully restored 1970 Vista Cruiser. It has the vinyl top with the “border” and Strato bucket seats with center floor shift console,and deluxe steering wheel. It’s got the 310 hp 350 Rocket, THM 350 trans,,,and it doesn’t leak not even one drop of any of the fluids,,runs like brand new!! Being that this car is so sweet,,the only plans I have for it is to re chrome the bumpers, paint it with a sweet base coat/clear coat paint, new vinyl top and install my new outside door handles,,detail the engine bay,,and be done with it,,,Just really liked you car and wanted to post a reply,,,would be cool to correspond further with you if there was a way to exchange contact info,,,,,,I’m on under the user name drcutlass Maybe I’ll see you there…….

  4. Harper Riley

    I have a 1970 Cutlass Supreme Convertible that is 100% original, passed down from my grandpa. I’ve been a car guy my whole life but I’m only 18. The car is in extremely good condition after sitting in a garage for about 25 plus years. In the past couple years, there has been a small amount of rust developing on the underside right below both doors. My goal was to tough up the paint and chrome and fix the rust. Anyone know how much I should be looking to spend on this (ball park figure)?


This site uses Akismet to reduce spam. .