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1958-59 Oldsmobile 371 J2 3x2 Triple Carburetion Tri-power Air Cleaner

$1,999.00 $1,899.00

This item is out of stock

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Ultra-rare OEM late 1958-59 Oldsmobile J2 371 3x2 Triple Carburation Air Cleaner. This assembly has been refinished in low-gloss black to present a period correct image. The offset and differently sized snorkels with correct inserted oval ends are in excellent condition and specific to the Oldsmobile models. The exterior features a GM licensed reproduction Air Cleaner Service Decal that replaces the originally located silk screen.  This assembly is specific to late 58 and all 59 Triple Carburation models in that it was an update to the oil bath models used early on in the program. Note that all of the carburetor flanges are the 2 1/8" diameter; later GM models introduced the larger center flange, as well as a myriad of differing snorkel locations and base plate indentations for the Cadillac/Pontiac/Chevrolet divisions.


An OEM lid featuring a single carburetor mounting hole enhances the assembly and features an Olds J2 Rocket decal (loosely installed-to be added by owner as desired). To complete the package, an NOS Fram high performance air filter and period correct wing nut are included. Note that the Oldsmobile lid was flat - it did not feature either a starburst pattern or multiple holes to mount to the external carburetors like the earlier 57 models from Chevrolet/Pontiac/Cadillac. 

While the intake manifold and carburetors were available in much larger numbers due to economies of scale within Olds (and other GM models for the carbs), the air cleaner was limited exclusively to the actual triple carburation models. As such, it is highly coveted and rare to find them- especially in excellent condition.

The last two pictures illustrate OEM and aftermarket air cleaners; original assemblies transcend both value and desire to collectors with classic car price points clearly demonstrating the difference.

This assembly is in excellent condition and will enhance your restoration. Best of all, it is a very rare and genuine GM part! 

For further information on the restoration process and options, please contact us.




This assembly is correct for the following 1958-59 Rocket 371 3x2 engines:


Super 88, Super 98, Starfire Ninety-Eight, Golden Rocket 88, Holiday 88, Fiesta Wagon


This assembly is a one-year only piece due to the size and nature of the snorkels. The J2 option was released in 57 and extended into 59 - purported total production of around 2,500 units. The earlier versions used a batwing oil bath filter, while late 57-59 models used the more conventional paper filter updated assembly. The Starburst lid with 3 wing nuts was used during the late 57-58 model years, paralleling similar tops on Cadillac, Chevrolet, and Pontiac tri-power assemblies. 




The assembly will fit factory 2GC/2G triple carburation Rochester carburetors with a 2 1/8" diameter flanges. If you have modified your carburetors, intake manifold or valve covers, please inquire first prior to bidding to ensure fitment is correct. Return requests for non-fitment will not be honored.





The assembly will ship within one day (usually the day of payment) with shipping/tracking information provided.



This assembly is guaranteed to match the item description – customers have up to 14 days to return the assembly after receipt if it is not as described.



Assemblies must be returned in the original packing – customers are responsible for return shipping charges. A refund will be issued upon receipt of the inspected assembly. Returns for non-fitment will not be honored – please ask questions first.



In the event of shipping damage, customers must save all packaging and send 5 digital pictures so Musclecar Air Cleaners can initiate a shipping damage claim.



We ship with


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Estimated shipping costs:

            US  $15-$30

            Canada / Hawaii / Alaska $45 +/-

            Scandinavia  $55 or less

            Australia  $85 or less