Gasket illustration – not the actual part
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Gasket illustration – not the actual partDiesel Parts Direct logo

Aftermarket parts may appear slightly different, including the packaging.

Cummins6CTA / ISC / QSCUpper Gasket Sets

DS-4089978 Upper Engine Gasket Kit For Cummins Engines

Compatible With ISC8.3 and QSC8.3 Engines

OEM #: 4089978SKU: DS4089978

Ships in 1-2 days

$411.95

Taxes and Shipping are calculated at checkout

Special Order Item - not eligible for return

Non-Returnable

The DS-4089978 Upper Engine Gasket Set can be used in the following engine models:

  • ISC
  • QSC: 2005 High Pressure Common Rail (HPCR) CM850
  • QSL9: High Pressure Common Rail (HPCR) CM850
SKU DS4089978
OEM Number 4089978
Part Type Top Gasket Sets
OEM Brand CUMMINS

Aftermarket warranty

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  • Orders are processed the same or next business day
  • Expedited shipping options available at Checkout
  • If same-day shipping is critical, please call to confirm availability

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Call any of our friendly Parts Dept. Specialists with your engine serial number, and we can quickly verify whether this part is the correct part for your engine — no guesswork.

Phone: 888.687.0539

Don't know how to find your engine serial number? Go to our Engine Help Center for assistance.

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