Skip to main content


The official club for enthusiasts of the

Oldsmobile Cutlass Supreme SX

..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... .....

As of November 22, 2016 there are 682 cars in the Cutlass SX Registry!
Oldsmobile and other car enthusiasts will find the content on this website interesting and entertaining. Members have access to factory documents, magazine articles and more!

The SX455 Club is the official resource club for the Oldsmobile Cutlass SX. Since 2005, we have been registering and documenting everything there is to know about these rare muscle cars. All visitors to this web site have access to general information about these cars.

You add your Cutlass SX to the official SX455 Registry for free or your can join our club for a small membership fee and have access to all the hidden content, data and documents only available to dues paying SX455 members. We invite you to join the SX455 Club.

Most muscle car experts will agree that Oldsmobile reached its pinnacle in 1970, the same year Oldsmobile introduced a notchback intermediate called the Cutlass Supreme.

In 1970 and 1971 this new Oldsmobile was available with a special option called the Y79 Performance Package and the car was named the Cutlass Supreme SX or more commonly called The Cutlass SX. The car featured a 455ci engine, a 400 Turbo Hydra-matic transmission, a cutout rear bumper with dual exhaust, special SX badges on the fenders and other goodies not found on a standard Cutlass Supreme. It was a 442 in disguise!

In 1970 there were three 455ci engine options for the Cutlass SX. In 1971 there was only one Cutlass SX engine. These engines offered up to 365HP and 510lbs of torque!

The production numbers for this two-year-only (1970 & 1971) model are less than half of the highly collectable Oldsmobile 442 models, plus many of the Cutlass SX cars were sent to the junk yard crusher before the car became collectable. Finding or seeing a Cutlass SX is rare.

ALL 1970 and 1971 standard Cutlass Supremes and the Cutlass SX models had same basic VIN codes, so identifying a real Cutlass SX can be difficult. This website will help you identify a real Cutlass SX. SX455 Club Members have access to Spotter Tips, Tech & Spec Data, and other helpful, informative and entertaining information. 

If you are thinking about purchasing a Cutlass SX,
do your research before you make an offer.

The Cutlass SX is certainly a unique and rare General Motors muscle car, and will continue to gain in popularity and value as more collector car enthusiasts discover these great cars. Sophisticated styling, luxury options and big block performance make the Cutlass SX a great gentleman's muscle car. Thanks for visiting our club web site.

 FREE - Add a car to the Cutlass SX Registry
FREE SX Registry Form

Print, Complete and Return the From
Note - The Free SX Registration does not give you access to the tons of content and data on this site.
If you want to access the all the information on this site, please choose a membership option below.  


Click Here to Join SX455 Today


Annual SX455 Club Membership $25. For Cutlass SX Owners
SX455 Members get their car added to the official SX Car Registry. You'll get a User Name and Password to access ALL the data, Olds factory documents, literature and CutlassSX magazine articles on You can upload unlimited photos of your car to your member profile page, post questions to the club message board, and more!

One Year Web Site Access 
$25. For non Cutlass SX owners

You will get a User Name and Password to access ALL the data. If you are thinking about buying a Cutlass SX be sure to check out the Spotter Tips, Tech and Spec Section and Price Guide of the site. Plus tons of Olds factory documents, literature and articles filled with great information.

Register Your Cutlass SX $10. Add your car to the SX455 Registry

The SX455 Club documents all 1970-1971 Cutlass SX cars. Since Oldsmobile did not keep records on these cars, registering your Cutlass SX helps to develop and maintain a history of these rare cars. Register your Cutlass SX and you'll receive a User Name and Password allowing you one month access to ALL the info, literature and data on

SX Reseach: 30 Day Web Site Access $15. For non Cutlass SX owners is the ultimate Cutlass SX resource. You will receive a User Name and Password giving you access to all the data on this web site. Discover how to identify a real Cutlass SX via the Spotter Tips and Tech & Spec info. Access official GM literature, magazine articles, build sheets, and other data. Plus you can post questions to the Message Board. Tons of great content for any car hobbyist or Oldsmobile enthusiasts!




Add a car to the
SX455 Registry

Click On Link
SX Registry Form

Print, Complete & Return Form
Email | Fax | US Mail


   Get  Access To:

SX Spotter Tips

Build Sheet Info

Tech & Spec Info 

Magazine Articles

Factory Literature

SX Price Guide

Member Directory

Message Board

Plus much more