New Camshaft Assembly for Cummins QSB / ISB Engines | 3954099

New Cummins QSB / ISB Camshaft Assembly – 3954099 | 3979506

Bring reliable timing and power back to your Cummins QSB or ISB engine with this brand new camshaft assembly, precision-built to OEM specifications. Designed for durability and smooth engine operation, this camshaft ensures accurate valve control and long service life, even in heavy-duty environments.

Fits: Cummins QSB and ISB diesel engines
Part numbers: 3954099, 3979506
Brand new: 100% new — not remanufactured or used
OEM-quality manufacturing: Machined for exact fitment and performance
Precision-ground lobes: Guarantees optimal valve timing and minimized engine wear
Ready to install: Direct replacement with no modifications required
Ideal for: Heavy-duty trucks, construction equipment, agricultural machinery, and industrial rebuilds

Upgrade your Cummins engine with a new QSB/ISB camshaft built for dependable performance and maximum uptime.

Cross Reference:

Manufacturer	OEM Number
CUMMINS	3979506
CUMMINS	4896421
CUMMINS	3954099

Weight	11.34 kg
Dimensions

We offer free standard ground shipping within the USA! If you need your parts in a hurry and would like to get them overnighted or expedited, please give us a call !

NOTE - CUT OFF TIME FOR SAME DAY SHIPPING IS 3PM CENTRAL TIME. ORDERS PLACED AFTER 3PM WILL SHIP OUT NEXT BUSINESS DAY. NEXTDAY SHIPMENTS THAT DO NOT ARRIVE ON TIME ARE NON-REFUNDABLE.

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

NOTE - All open orders will have a 20% restocking fee. All returns will have a shipping fee.

1 YEAR WARRANTY

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New Camshaft Assembly for Cummins QSB / ISB Engines | 3954099 | 3979506

$345.00

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Designed for durability and smooth engine operation, this camshaft ensures accurate valve control and long service life, even in heavy-duty environments.\u003c\/p\u003e\n\u003cul data-start=\"693\" data-end=\"1189\"\u003e\n\u003cli data-start=\"693\" data-end=\"741\" class=\"\"\u003e\n\u003cp data-start=\"695\" data-end=\"741\" class=\"\"\u003e\u003cstrong data-start=\"695\" data-end=\"703\"\u003eFits\u003c\/strong\u003e: Cummins QSB and ISB diesel engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"742\" data-end=\"780\" class=\"\"\u003e\n\u003cp data-start=\"744\" data-end=\"780\" class=\"\"\u003e\u003cstrong data-start=\"744\" data-end=\"760\"\u003ePart numbers\u003c\/strong\u003e: 3954099, 3979506\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"781\" data-end=\"837\" class=\"\"\u003e\n\u003cp data-start=\"783\" data-end=\"837\" class=\"\"\u003e\u003cstrong data-start=\"783\" data-end=\"796\"\u003eBrand new\u003c\/strong\u003e: 100% new — not remanufactured or used\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"838\" data-end=\"915\" class=\"\"\u003e\n\u003cp data-start=\"840\" data-end=\"915\" class=\"\"\u003e\u003cstrong data-start=\"840\" data-end=\"869\"\u003eOEM-quality manufacturing\u003c\/strong\u003e: Machined for exact fitment and performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"916\" data-end=\"1005\" class=\"\"\u003e\n\u003cp data-start=\"918\" data-end=\"1005\" class=\"\"\u003e\u003cstrong data-start=\"918\" data-end=\"944\"\u003ePrecision-ground lobes\u003c\/strong\u003e: Guarantees optimal valve timing and minimized engine wear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1006\" data-end=\"1081\" class=\"\"\u003e\n\u003cp data-start=\"1008\" data-end=\"1081\" class=\"\"\u003e\u003cstrong data-start=\"1008\" data-end=\"1028\"\u003eReady to install\u003c\/strong\u003e: Direct replacement with no modifications required\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1082\" data-end=\"1189\" class=\"\"\u003e\n\u003cp data-start=\"1084\" data-end=\"1189\" class=\"\"\u003e\u003cstrong data-start=\"1084\" data-end=\"1097\"\u003eIdeal for\u003c\/strong\u003e: Heavy-duty trucks, construction equipment, agricultural machinery, and industrial rebuilds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1191\" data-end=\"1303\" class=\"\"\u003eUpgrade your Cummins engine with a \u003cstrong data-start=\"1226\" data-end=\"1250\"\u003enew QSB\/ISB camshaft\u003c\/strong\u003e built for dependable performance and maximum uptime.\u003c\/p\u003e\n\u003cp\u003eCross Reference:\u003c\/p\u003e\n\u003ctable style=\"width: 100%;\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 49.9106%; 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Designed for durability and smooth engine operation, this camshaft ensures accurate valve control and long service life, even in heavy-duty environments.\u003c\/p\u003e\n\u003cul data-start=\"693\" data-end=\"1189\"\u003e\n\u003cli data-start=\"693\" data-end=\"741\" class=\"\"\u003e\n\u003cp data-start=\"695\" data-end=\"741\" class=\"\"\u003e\u003cstrong data-start=\"695\" data-end=\"703\"\u003eFits\u003c\/strong\u003e: Cummins QSB and ISB diesel engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"742\" data-end=\"780\" class=\"\"\u003e\n\u003cp data-start=\"744\" data-end=\"780\" class=\"\"\u003e\u003cstrong data-start=\"744\" data-end=\"760\"\u003ePart numbers\u003c\/strong\u003e: 3954099, 3979506\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"781\" data-end=\"837\" class=\"\"\u003e\n\u003cp data-start=\"783\" data-end=\"837\" class=\"\"\u003e\u003cstrong data-start=\"783\" data-end=\"796\"\u003eBrand new\u003c\/strong\u003e: 100% new — not remanufactured or used\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"838\" data-end=\"915\" class=\"\"\u003e\n\u003cp data-start=\"840\" data-end=\"915\" class=\"\"\u003e\u003cstrong data-start=\"840\" data-end=\"869\"\u003eOEM-quality manufacturing\u003c\/strong\u003e: Machined for exact fitment and performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"916\" data-end=\"1005\" class=\"\"\u003e\n\u003cp data-start=\"918\" data-end=\"1005\" class=\"\"\u003e\u003cstrong data-start=\"918\" data-end=\"944\"\u003ePrecision-ground lobes\u003c\/strong\u003e: Guarantees optimal valve timing and minimized engine wear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1006\" data-end=\"1081\" class=\"\"\u003e\n\u003cp data-start=\"1008\" data-end=\"1081\" class=\"\"\u003e\u003cstrong data-start=\"1008\" data-end=\"1028\"\u003eReady to install\u003c\/strong\u003e: Direct replacement with no modifications required\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1082\" data-end=\"1189\" class=\"\"\u003e\n\u003cp data-start=\"1084\" data-end=\"1189\" class=\"\"\u003e\u003cstrong data-start=\"1084\" data-end=\"1097\"\u003eIdeal for\u003c\/strong\u003e: Heavy-duty trucks, construction equipment, agricultural machinery, and industrial rebuilds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1191\" data-end=\"1303\" class=\"\"\u003eUpgrade your Cummins engine with a \u003cstrong data-start=\"1226\" data-end=\"1250\"\u003enew QSB\/ISB camshaft\u003c\/strong\u003e built for dependable performance and maximum uptime.\u003c\/p\u003e\n\u003cp\u003eCross Reference:\u003c\/p\u003e\n\u003ctable style=\"width: 100%;\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 49.9106%; text-align: center;\"\u003e \u003cstrong\u003eManufacturer\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 49.9106%; text-align: center;\"\u003e\u003cstrong\u003eOEM Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 49.9106%;\"\u003eCUMMINS\u003c\/td\u003e\n\u003ctd style=\"width: 49.9106%;\"\u003e3979506\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 49.9106%;\"\u003eCUMMINS\u003c\/td\u003e\n\u003ctd style=\"width: 49.9106%;\"\u003e4896421\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 49.9106%;\"\u003eCUMMINS\u003c\/td\u003e\n\u003ctd style=\"width: 49.9106%;\"\u003e3954099\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e"}

Engine Serial Number

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SKU: 3954099 Category: Camshaft & Rocker Arms CUMMINS

New Camshaft Assembly for Cummins QSB / ISB Engines | 3954099 | 3979506

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New Camshaft Assembly for Cummins QSB / ISB Engines | 3954099 | 3979506

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