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The official club for enthusiasts of the

1970 & 1971 Oldsmobile Cutlass Supreme SX


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Bob Peters
SX455 Club President
E-mail Bob Peters


Dues paying members only
Phone 702.580.8907
(10am-8pm PST)


 Become an Annual Member
Join by Mail

 Send $25 Check
Payable to: SX455

(Click link to print form)

SX455 Membership Form

Alan and Bob SX Home Bage 2019

As of July 1, 2020 there are 749 cars in the Cutlass SX Registry!
In 1970 Oldsmobile introduced a new Cutlass Supreme options called the SX Performance Package. The Y-79 option featured several 455ci engine options, 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. Order the right options and you had a 442 in disguise and avoided the high muscle car insurance premiums. At minimum you would own a rare muscle car that would only last until 1971.

The SX455 Club is the official resource for all things Oldsmobile Cutlass SX. Since 2005, we have been registering as many SX cars as possible and documenting everything there is to know about these rare muscle cars. 

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, even at the largest Oldsmobile Club of America annual nationals meet.

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. 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.

Oldsmobile and other car enthusiasts will find the content on this website interesting, informative and entertaining. You do not need to own a Cutlass SX to join If you own a Cutlass SX you can add your car to the SX Registry at no additional charge. After you join, you'll get a user name and password that will give you access to all the content and information on this web site. 

Members will find detailed information on how to identify a real Cutlass SX via our Spotter Tips and Tech & Spec pages. Your find production numbers, exterior and interior color combinations and our SX Price Guide. There are 25 Oldsmobile Factory and Dealer Memos, build sheet samples and other rare documents. You can read 16 magazine articles about the Cutlass SX dating back to 1970. View the SX Member Directory, photos more! We invite you to join SX455.

If you own a Cutlass SX, when you join SX455, you'll be able to add you car to the official Cutlass SX Registry by answering a series of questions about your car. Non SX455 members can also add your car to the SX Registry for free - see link to the form at the bottom of this page.

JOIN TODAY and gain access to ALL the information on the SX455 Web site!

Online Memberships Options (Visa, MasterCard, AMEX)

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 Cutlass SX magazine articles. 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 on the web site. 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. DO YOUR RESEACH BEFORE YOU MAKE AN OFFER!

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 our continued efforts to document 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 this site.

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!

SX455 Membership Form

Add your Cutlass SX to the Official SX Registry by printing, completing and returning the form

FREE SX Car Registry Form