Remanufactured Jeep 4.6L (280 ci) stroker inline-6: a 4.0L block bored .030" over with a 4.2L-stroke (3.895") crankshaft, new forged connecting rods and new pistons. Built for 1991-2006 Cherokee XJ, Wrangler YJ/TJ/LJ, Grand Cherokee ZJ/WJ and Comanche MJ. Choose your engine year, cam and compression above. Zero miles, built to order, free shipping, no core charge.

Build time: 4-5 weeks, plus shipping.

Fitment

Confirm your engine

• Engine year and ignition: choose the group that matches your Jeep above. We build the stroker on the correct block, head and front end for your year.
• Distributor or coil rail: a distributor (round cap with plug wires) means distributor. A coil pack rail across the top of the valve cover, with no distributor, means coil rail. 1999 is a split year (Cherokee and Wrangler have a distributor, Grand Cherokee WJ has a coil rail). Confirm by VIN.
• Head casting: 7120 (1991-1995), 0630 (1996-1999/2000, distributor), 0331 (coil rail, 1999-2006).
• Not sure? Choose "Not sure" in the dropdown and call 623-204-6365 or put notes on the order.

Send us your VIN with your order to confirm fitment.

Notes

• Displacement: 3.905" bore x 3.895" stroke = 280 ci (4.6L). Stock 4.0L is 3.875" x 3.414" (242 ci).
• Rotating assembly (Clegg stroker kit): Scat/Eagle 9000 cast steel crankshaft (3.895" stroke), Eagle 5140 forged I-beam rods with ARP bolts, KB hypereutectic dish pistons, King bearings. Crankshaft assembly balanced.
• Camshaft: Clegg Stage 1 NSR cam kit standard, with Stage 2, Stage 3 and custom cam upgrades (see Cam stages below). 1999-2006 engines get the Clegg cam gear pin-and-spring bolt (cam button conversion), included.
• Cylinder head is not ported or polished.
• Reuse your own flywheel or flexplate and crank position sensor. Manual and automatic versions are different, so keep the ones that came on your Jeep.
• We pressure check and inspect every head for cracks.

Not covered

• 1987-1990 Renix 4.0L: not offered
• Larger stroker combinations (4.060" stroke crank, sometimes sold as "5.0L"): call us
• 2.5L 4-cylinder, 4.2L (258) carbureted engines, and the 2007+ Wrangler JK 3.8L V6

Compression

• 9.3:1 (recommended): Clegg's best-selling 4.6L kit, CE-J46-STR2 (KB -21cc dish pistons).
• 8.8:1 (lower compression): Clegg kit CE-J46-STR2-1 (KB -27.5cc dish pistons). Not sure which? Call 623-204-6365.

Cam stages

Every cam is a Clegg kit with new lifters, pushrods and timing set. Choose your cam and compression above.

Stage 2 and Stage 3 lift is above what the stock valve springs handle, so we install upgraded springs, retainers and locks and machine the spring seats and valve guides to fit them. All included in the +$190.

Custom / other brand cam (+$300): we can use any make of camshaft you request. Valve springs are quoted if your cam needs them. Custom grinds are non-refundable.

What to expect

• The extra stroke mainly adds low-end and mid-range torque. The engine pulls harder off idle and up hills than a stock 4.0L; it is not a high-rpm build.
• We don't publish a horsepower number for this combination. Results vary with fuel, gearing, exhaust, intake and tire size.

Every build includes

• 4.6L stroker rotating assembly installed and balanced
• Clegg Stage 1 NSR cam kit (cam, 12 lifters, 12 pushrods, timing set), or your chosen upgrade
• Stage 2 and Stage 3: upgraded valve springs, retainers and locks, with spring-seat and valve-guide machining
• 1999-2006 engines: Clegg cam gear pin-and-spring bolt
• Set of six Clegg 24 lb/hr (252cc) fuel injectors, CE-JPFI (shipped with the engine; includes the injector adapters needed on 1991-1998 engines)

Required / recommended

• Fuel injectors required: run 24 lb/hr injectors (included). The stock injectors are too small for the extra displacement.
• Tune: 1991-2006 engines generally run on the factory computer with 24 lb/hr injectors. A tune is recommended but not required. We do not tune.
• Fuel pressure: check fuel pressure at install. Your fuel pump and filter must be in good condition.
• Cooling required: the radiator, fan clutch or electric fan, thermostat and water pump must be in good condition. An upgraded radiator is recommended for towing and hot climates.
• Crank sensor and flywheel/flexplate: reuse the ones matched to your year and transmission.
• Recommended: a free-flowing exhaust. A larger throttle body is optional.

Stock version

Prefer a stock engine? See our Remanufactured Jeep 4.0L (1991-2006) listing.

What's included

• Machined, milled and polished internals (crankshaft, block, cylinder bores)
• All new bearings and parts: main and rod bearings, pistons, piston rings, connecting rods, head gasket, oil pump, timing set, camshaft and lifters
• Cylinder head fully machined: 3-angle performance valve job including seats, diamond mill finish, new valve seals

Delivery type

• Business with dock/forklift or terminal pickup: free
• Business without dock (lift gate): +$100
• Residential (includes lift gate): +$300

Shipping is free within the Continental United States to commercial addresses with a forklift/dock or terminal pickup. If the delivery address doesn't match the delivery type selected, the difference will be charged before shipping. Alaska & Hawaii: online checkout isn't available for engines shipping to AK or HI. Call 623-204-6365 for a freight quote before ordering. Approx. weight 450 lbs.

Break-in

Follow our break-in procedure.

Warranty and core

Warranty: high-performance build, sold without warranty. If something's wrong, we'll work with you case by case to make it right. See our Warranty & Refund Policy.

Core charge: none. All engines are built to order.

Returns and cancellations: this is a high-performance upgrade, so there are no refunds or returns. You can cancel within 24 hours of ordering for a full refund. Custom grind cams are non-refundable.

Questions about fitment? Contact us before ordering.