Home/All Cylinder Head Parts/5348546 Cummins ISL G 8.9L Natural Gas Loaded Cylinder Head – New
5348546 Cummins ISL G natural gas loaded cylinder head - new, JAK's Diesel
Cummins · Models: ISL G / ISL / ISL9

5348546 Cummins ISL G 8.9L Natural Gas Loaded Cylinder Head – New

Commercial diesel cylinder head. Match the listed part and engine identifiers before ordering.
Warranty DetailsJAK's DieselMay Qualify for Free Freight
$2,399.00
In Stock
Fitment details

Want us to check the fit? Share any details you have below. All fields are optional. Your request will be included with your order, and a specialist may contact you before fulfillment.

Secure Checkout Review Return Policy Warranty Details May Qualify for Free Freight
JAK'S Part #JAKS-5348546
Not sure it's the right fit? Call a specialist
(720) 445-6249
Talk to a tech or text a photo of your part tag — we'll confirm fitment before you buy
5348546 Cummins ISL G 8.9L Natural Gas Loaded Cylinder Head – New
BrandJAK's Diesel
Part CategoryCylinder Heads
Engine MakeCummins
Engine ModelISL G · ISL · ISL9
ConditionNew
Stage / TierStage 1

New, fully loaded cylinder head for the Cummins ISL G 8.9L natural gas engine, built to replace Cummins 5348546 and 5569421. Common in transit buses and refuse trucks running CNG or LNG. It arrives assembled and ready to bolt on, with no core to send back.

What's Included

  • New cylinder head casting
  • New intake and exhaust valves (Stage 1 — natural-gas valve package)
  • New valve springs, retainers and keepers
  • Valve guides and valve stem seals installed

Not included: head gasket set, head bolts, injectors, rocker assemblies. Ask us and we will quote the matching gasket set and bolt kit.

Specifications

Replaces Cummins 5348546, 5569421 and cross-references below
Engine Cummins ISL G / ISL9 G 8.9L spark-ignited natural gas
Condition New — no core
Assembly Loaded (valves, springs, retainers, keepers, guides, seals)
Valve package Stage 1 — natural-gas application
Brand JAK's Diesel

Fitment

Fits Cummins ISL G and ISL9 G spark-ignited natural gas engines (CNG / LNG). This head has spark-plug bores and is not for the diesel ISL. We confirm fitment by engine serial number (ESN) or casting number before every head ships.

Replaces / Cross-Reference Part Numbers

OEM and reman numbers: 5348546, 5348546RX, 5569421, 5569421RX, 4933817, 4933818, 4933819, 4933820, 4933820NX, 4933820RX, 4933830NX

Shipping, Core & Warranty

  • No core charge, no core return. This is a new casting, not an exchange unit.
  • Freight: ships crated by LTL freight. Freight is free to a commercial address with a forklift or dock. Residential, liftgate and terminal delivery can be quoted — call before you order.
  • Local pickup: available in Henderson, CO by arrangement.
  • Warranty: 1 year against defects in materials and workmanship.

Frequently Asked Questions

Is this head new or remanufactured?

New. It is a new casting assembled with new valvetrain components — not a rebuilt core.

Do I have to send back a core?

No. There is no core charge and nothing to return.

What else do I need to install it?

Plan on a new head gasket set and head bolts for the ISL G. They are not included. Message us and we will match the right kit to your engine serial number.

How do I confirm it fits my ISL G?

Send us your engine serial number (ESN) or the casting number from your old head. We verify fitment against 5348546 before the head ships.

Will this fit a diesel ISL?

No. The ISL G head is built for spark-ignited natural gas engines and has spark-plug bores. Diesel ISL engines use a different head.

How long does delivery take?

Heads are crated and handed to the LTL carrier in 1–2 business days. Transit is typically 2–5 business days depending on your location.

Questions? Call JAK's Diesel at (720) 445-6249. See all Cummins ISC & ISL parts or diesel cylinder heads.