How do I confirm pilotpart374163-8590503051512 fits my machine?

Compare the OEM or reference part number, machine model, engine model, and serial number. You can also submit a fitment inquiry before ordering.

In Stock

Bare Cylinder Block 3938366 for Cummins Engine ISB4.5 QSB4.5 4BT 4B3.9

For Cummins Cylinder Block

Cylinder Block QSB4.5 for Cummins

OEM / REF: QSB4.5SKU: pilotpart374163-8590503051512

Bare Cylinder Block 3938366 for Cummins Engine ISB4.5 QSB4.5 4BT 4B3.9 is a Cylinder Block replacement part for Cummins Cab & Body Parts, categorized under Cab & Body Parts > Cylinder Block. Use OEM part number QSB4.5 and confirm machine model, engine model, and serial details before checkout.

Stock: In stock
Condition: New
Fitment: Cummins Engine Spare Parts
Category: Cylinder Block

Fitment support before you order
Worldwide delivery options

In stock — ready to order

$1,549.00USD/EA

Estimated delivery by quantity

Estimated delivery windows
Qty	Estimated delivery
1	Oct 22 – Oct 29
10	Oct 20 – Oct 27
50	Oct 18 – Oct 25

Estimates from today; confirm exact lead time before payment.

Quantity

Buy online now or add to your quote list for bulk pricing and fitment confirmation.

Confirm fitment before ordering →

Lead times can vary by freight route and customs. Contact support for expedited shipping.

Cylinder Block Description

This Cylinder Block is indexed for Cummins s : Cummins ISB4.5, QSB4.5, 4BT, 4B3.9, 4BTA, QSB5.9 30 CM550. Compare reference number QSB4.5 against the label on your existing Cummins component before ordering.

Additional cross references on file: 4B3.9, 4BTA, 3938366. If your machine plate shows a different number, submit a fitment inquiry with photos before checkout.

Part Numbers and Cross References

QSB4.54B3.94BTA3938366

Applications

Cummins s : Cummins ISB4.5, QSB4.5, 4BT, 4B3.9, 4BTA, QSB5.9 30 CM550

Fitment Notes

Brand or application signal: Cummins Engine Spare Parts
Product family: Cylinder Block
System category: Engine Spare Parts > Cylinder Components > Cylinder Block
Recommended verification: OEM number, engine model, serial number, old part photos, and dimensions.

Shipping & Returns

Availability: InStock
Shipping: Shipping quotes can be confirmed before payment for heavy or urgent orders.
Returns: Returns are easier when fitment is confirmed before ordering.
B2B support: Bulk, fleet, and repair-shop requests can be handled through the inquiry form.

Frequently Asked Questions

How do I confirm this part fits my machine?

Match the OEM or reference number first, then verify machine model, engine model, serial number, connector layout, mounting points, and old part photos.

Can I order if my part number is not listed?

Yes. Send the old part number, machine plate, and photos through the fitment inquiry form. Support can review possible replacements or alternatives.

Is this an OEM part?

Products are indexed as replacement parts unless explicitly marked otherwise. Always compare reference numbers and confirm fitment before purchase.