GMC SIERRA 3500 HD Engines & Components

Mahle Original Valve Cover Grommets GS33466

Valve Cover Grommet, Rubber, Buick, Cadillac, Chevy, GMC, Hummer, Saab, Set of 8

Part Number: MAH-GS33466

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Chevrolet Performance Valve Springs 12706568

Valve Spring, L76/L92 Style,.520 Max lift, Single Beehive, 1.290 in. o.d., 1.230 in. Coil Bind, 1.800 in. Installed Height, Each

Part Number: NAL-12706568

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ATP Graywerks Harmonic Balancers 102171

Harmonic Balancer, Internal Balance, Nodular Iron, Buick, Cadillac, Chevy, GMC/Hummer/Isuzu, Small Block, Each

Part Number: ATP-102171

3.0 out of 5 stars ( 2 )

Estimated Ship Date: May 12, 2026 if ordered today

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Estimated Ship Date: May 12, 2026 if ordered today

Dura-Bond High Performance Cam Bearings CH-25-2

Cam Bearings, Direct Replacement, Bi-metal, Lead-Based Micro Babbitt, Chevy, Small Block LS, Position 2 or 4, Each

Part Number: DUR-CH-25-2

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Hastings Piston Ring Sets 2M5170020

Piston Rings, Plasma-moly, 4.020 in. Bore, 1.2mm, 1.5mm, 2.5mm Thickness, 8-Cylinder, Set

Part Number: HSN-2M5170020

1.0 out of 5 stars ( 1 )

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Melling Valve Springs VS-1688

Engine Valve Spring, Stock Replacement V

Part Number: MEL-VS-1688

Not Yet Reviewed

Estimated Ship Date: May 27, 2026 if ordered today

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Estimated Ship Date: May 27, 2026 if ordered today

Dorman Oil Line Block-Off Plate Kits 99971

Oil Line Block-Off Plate, Aluminum, Natural, Cadillac, Chevrolet, GMC, Hummer, Pontiac, Kit

Part Number: RNB-99971

2.0 out of 5 stars ( 1 )

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Cloyes Gear Camshaft Phasers VC143

Engine Variable Valve Timing (VVT) Sprocket

Part Number: CLO-VC143

Not Yet Reviewed

Estimated Ship Date: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today

PRW Billet Steel Timing Sets 5034611

PRW Billet Steel Timing Sets 5034611

Timing Chain and Gear Set, Roller, Single Roller, Billet Steel Sprockets, Chevy, GMC, Small Block LS, Set

Part Number: PQX-5034611

Not Yet Reviewed

Estimated Ship Date: Jul 1, 2026 if ordered today

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Estimated Ship Date: Jul 1, 2026 if ordered today

Cloyes Replacement Timing Chains 9-131-5

Replacement Timing Chain, True Roller, Chevy, Pontiac, 0.005 in. Reduced Center, Each

Part Number: CLO-9-131-5

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Fluidampr Harmonic Dampers 760131

Harmonic Balancer, Chevy, GMC, 6.6L Duramax, Internal Balance, Steel, Black, Each

Part Number: FLU-760131

Not Yet Reviewed

Estimated Ship Date: Jun 5, 2026 if ordered today

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Estimated Ship Date: Jun 5, 2026 if ordered today

Need It Sooner? We recommend these similar substitute parts:

ATI Super Damper Diesel Harmonic Balancers ATI917378

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Sealed Power Cam Bearings 2115M

Cam Bearings, Steel Backed Babbitt, Chevy, Set

Part Number: SLP-2115M

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ACDelco GM Genuine Parts Idler Pulleys 12611935

Idler Pulley, Replacement, Serpentine, Steel, Black, Buick, Chevy, GMC, Pontiac, Saturn, Each

Part Number: ADO-15-4983

Not Yet Reviewed

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Pacific Performance Engineering Aluminum Oil Pans 114052020

Oil Pan, Aluminum, Black, 5 qt., Chevrolet, GMC, 6.6L, Diesel, Each

Part Number: PPE-114052020

5.0 out of 5 stars ( 2 )

Estimated Ship Date: May 22, 2026 if ordered today

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Estimated Ship Date: May 22, 2026 if ordered today

Dorman Timing Covers 635-517

Timing Covers, 1-Piece, Plain, Aluminum, Natural, Gaskets Included, GM, Each

Part Number: RNB-635-517

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ACDelco GM Genuine Parts Automatic Transmission Fluid Filler Tube Seals 15796802

Transmission Fluid Dipstick Components, GM Genuine Parts Dipstick Tube Grommet, Cadillac, Chevrolet, GMC, Hummer, Each

Part Number: ADO-15796802

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Radium Engineering Catch Can Kits 20-0233-FL

Catch Can, PCV, 7 oz. Capacity, -10 AN O-Ring, Billet Aluminum, Black, Cadillac, Chevy, GMC, Kit

Part Number: RDM-20-0233-FL

Not Yet Reviewed

Estimated Ship Date: May 18, 2026 if ordered today

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Estimated Ship Date: May 18, 2026 if ordered today

Dorman Idler Pulleys 419-602

Idler Pulley, Serpentine, Steel, Black, Each

Part Number: RNB-419-602

4.43 out of 5 stars ( 7 )

Estimated Ship Date: Today

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PRW Billet Steel Timing Sets 5034622

Timing Chain and Gear Set, Roller, Double Roller, Billet Steel Sprockets, Chevy, GMC, Small Block LS, Set

Part Number: PQX-5034622

Not Yet Reviewed

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Trans-Dapt Performance Oil Cooler Sandwich Adapters 1327

Adapter, Oil Filter, Sandwich, Aluminum, Natural, 22mm x 1.5mm Thread, 3/8 in. NPT Inlet/Outlet, Each

Part Number: TRD-1327

1.0 out of 5 stars ( 1 )

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Fel-Pro Headbolt Kits ES72344

Cylinder Head Bolts, Steel, Factory Upgrade, 12-Point Heads, GM, 6.6L Duramax, Torque-To-Yield, Single Head Only, Kit

Part Number: FEL-ES72344

5.0 out of 5 stars ( 2 )

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ACDelco Engine Oil Pump Relief Valves 12608835

Pressure Relief Valves, Engine Oil Pump Relief Valves, Designed for 6.0L L96 Engines, Cadillac, Chevrolet, GMC, Hummer, Pontiac, Each

Part Number: ADO-12608835

5.0 out of 5 stars ( 2 )

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Granatelli Motor Sports Valve Covers 640365

Valve Covers, Stock Height, Centerbolt, Cast Aluminum, Natural, Avanti, Buick, Cadillac, Chevy, GMC, Hummer, Pontiac, Saab, Chevy Small Block LS, Pair

Part Number: GRN-640365

Not Yet Reviewed

Estimated Ship Date: May 26, 2026 if ordered today

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Estimated Ship Date: May 26, 2026 if ordered today

Melling M-Select Class 3 Camshafts 22307

Engine Camshaft, High Performance Camshaft

Part Number: MEL-22307

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King SI-Series Main Bearings MB5766SI

Main Bearings, SI-Series, Standard Size, Bi-metal, Silicon Aluminum, Chevy, 4.8, 5.3L, Set of 5

Part Number: KGB-MB5766SI

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