Valve Job - Complete

Complete valve job procedure for 2005 Dodge Viper 8.3L V10, including cylinder head removal, valve service, machining, and reinstallation with timing chain service.

Warnings

Tools required

Parts

• Cylinder head gasket set (complete) × 1 — Use OEM specification
• Valve cover gaskets × 2 — Use OEM specification
• Timing cover gasket × 1 — Use OEM specification
• Intake manifold gasket set × 1 — Use OEM specification
• Exhaust manifold gaskets × 2 — Use OEM specification
• Valve stem seals × 20 — Use OEM specification
• Cylinder head bolts (TTY) × 1 — Use OEM specification - do not reuse
• Timing chain tensioner O-rings × 2 — Use OEM specification
• Camshaft position sensor O-ring × 2 — Use OEM specification
• Coolant × 1 — Zerex G-05 HOAT
• Engine oil and filter × 1 — 0W-40 full synthetic

Fluids

• Zerex G-05 HOAT 50/50 — 19 qt
• 0W-40 full synthetic — 11 qt

Preparation

1. Position vehicle on level surface and engage parking brake.
2. Disconnect negative battery cable and isolate it from the terminal.
3. Remove engine cover panels and belly pans for access.
4. Drain cooling system completely into appropriate container by opening radiator petcock and removing lower radiator hose.
5. Drain engine oil and remove oil filter.
6. Relieve fuel system pressure by removing fuel pump fuse and cranking engine until it stalls.
7. Remove air intake system including air box, intake tube, and throttle body connection.
8. Tag and photograph all vacuum lines, electrical connectors, and hose routing before disconnection.
9. Support engine with fixture or hoist as motor mounts will be loaded during head removal.

Procedure

1. 1

   Remove Valve Covers
   Disconnect ignition coil connectors and remove all 10 coil packs from both banks. Remove PCV hoses and breather connections from valve covers. Remove valve cover bolts in reverse sequence (outside-to-inside pattern) and lift covers off. Note the integrated spark plug tube seals in the covers.
2. 2

   Remove Intake Manifold
   Disconnect fuel rails from manifold (release pressure fittings by pressing retainer tabs). Disconnect throttle cable and cruise control cable if equipped. Remove all intake manifold bolts working from outside toward center. The long-runner intake manifold is a single assembly on this engine. Carefully lift manifold away and inspect plenum gaskets for condition.
3. 3

   Remove Exhaust Manifolds
   Working from underneath, disconnect exhaust pipes from both manifolds at the collector flanges. Remove heat shields if present. Remove exhaust manifold nuts working from cold (outer) ends toward hot (center) positions. The manifolds are cast iron and may require penetrating oil if fasteners are corroded. Keep left and right bank hardware separated.
4. 4

   Remove Accessory Drive Components
   Remove serpentine belt by releasing automatic tensioner. Remove alternator and set aside with wiring attached. Remove power steering pump mounting bolts and secure pump out of the way without disconnecting hoses. Remove A/C compressor mounting bolts and support compressor without disconnecting refrigerant lines. Remove belt tensioner assembly.
5. 5

   Remove Timing Cover and Set TDC
   Rotate crankshaft to Top Dead Center (TDC) on cylinder #1 using breaker bar on crankshaft bolt. Verify timing marks on camshaft sprockets align with marks on timing cover. Remove timing cover bolts in sequence and carefully pry cover away from block using plastic pry points (not sealing surfaces). Inspect timing chain for wear and stretch. Mark chain-to-sprocket relationship with paint pen on both camshaft sprockets.
6. 6

   Lock Timing Chain and Remove Camshaft Sprockets
   Install timing chain keeper tool or zip-tie chain to prevent it from dropping into timing case. Remove the timing chain tensioner(s) by unbolting and carefully extracting (note: tensioners are spring-loaded). Confirm the exact number of tensioners and chain configuration against the factory service manual for this engine. Hold each camshaft with wrench on hex section and remove camshaft sprocket bolts. Carefully slide sprockets off camshafts while keeping chain supported and maintaining its position on the crankshaft sprocket.
7. 7

   Remove Rocker Arms and Pushrods
   Remove rocker arm bolts and lift off rocker assemblies. This engine uses a shaft-mounted rocker system; verify the exact number of shaft pedestals per bank against the factory service manual. Keep rockers organized by cylinder number. Remove all pushrods and store them in order in a numbered rack. Inspect pushrod ends and rocker contact surfaces for wear scoring or galling. Measure pushrod length and straightness with dial indicator - replace if bent more than 0.010 inch.
8. 8

   Remove Cylinder Heads
   Remove cylinder head bolts in reverse of tightening sequence (outside-to-inside, spiral pattern). Verify the exact cylinder head bolt count per head against the factory service manual before proceeding. Carefully break heads loose from block using plastic pry points in designated lifting areas. Lift heads straight up to avoid damaging deck surface. Place heads on clean padded work surface with combustion chambers facing up. Immediately cover exposed cylinder bores with clean shop towels to prevent debris entry.
9. 9

   Disassemble Cylinder Heads for Machine Work
   Using valve spring compressor, compress each valve spring and remove keepers with magnetic tool. Release compressor and remove retainer, spring, and valve. Keep all components organized by cylinder and intake/exhaust position. Remove and discard all valve stem seals. Inspect valves for burning, pitting, and stem wear. Measure valve stem diameter and compare to service limits. Clean all carbon from combustion chambers and valve guides using appropriate chemicals and brushes.
10. 10

    Machine Shop Services
    Transport cylinder heads to qualified machine shop for the following services: valve grinding to proper seat angle (typically 45 degrees), valve seat reconditioning or replacement, valve guide inspection and replacement per factory wear-limit specifications, cylinder head surface milling to restore flatness within the OEM-specified maximum material-removal limit (verify exact limits in the service manual), pressure testing for cracks, and valve spring pressure testing. Request machine shop to clean heads thoroughly after machining. Provide machine shop with OEM valve seat specifications and minimum/maximum head milling limits for the 8.3L V10.
11. 11

    Inspect and Clean Engine Block
    With heads removed, thoroughly clean cylinder head deck surfaces using plastic gasket scraper - do not use metal tools that could score aluminum. Clean all bolt holes with thread chaser and compressed air. Inspect deck surface for flatness using precision straightedge and feeler gauges - maximum allowable warpage is 0.002 inch over any 6-inch span. Check cylinder bore condition at top edge for ridge wear. Rotate crankshaft and inspect all rod bearings and main bearings while accessible. Stuff clean rags into cylinders and cover block with plastic sheeting.
12. 12

    Reassemble Cylinder Heads with New Valves
    Once heads return from machine shop, install new valve stem seals on all guides using appropriate driver tool - tap into place until seated. Lubricate valve stems with assembly lube or engine oil. Insert valves into guides. Install valve springs with dampener side toward head (if directional). Compress springs and install keepers, ensuring they seat properly in valve stem grooves. After all valves are installed, tap each valve stem lightly with plastic hammer to verify keeper seating. Check installed spring height with caliper - should be within 0.030 inch of specification.
13. 13

    Install Cylinder Heads
    Remove protective coverings from cylinder bores and verify bores are clean. Install new head gaskets on block, checking for correct orientation (FRONT marking visible). Head gaskets are NOT interchangeable left-to-right - verify correct bank. Apply light oil to NEW cylinder head bolt threads and underside of bolt heads. Carefully lower cylinder heads onto block, aligning dowel pins. Install all head bolts finger-tight. Torque cylinder head bolts in the factory-specified sequence and to the exact multi-stage torque plus torque-angle values listed in the OEM service manual for the 8.3L V10. Do not use generic values — verify each stage and the final angle against factory documentation. Work from center bolts outward in spiral pattern.
    Torque spec

    Cylinder Head Bolts65 Nm (48 lb-ft)
14. 14

    Install Pushrods and Rocker Assemblies
    Rotate crankshaft to position each cylinder at base circle (valve closed) before installing rocker for that cylinder. Install pushrods in their original positions, seating ball ends into lifter sockets. Apply assembly lube to rocker arm contact points and pushrod tips. Install rocker shaft assemblies with oil feed holes facing downward. Tighten rocker arm bolts to specification with corresponding camshaft lobe pointing away from rocker (base circle position) to avoid preloading valves. Verify all pushrods rotate freely after installation.
    Torque spec

    Rocker Arm Bolts30 Nm (22 lb-ft)
15. 15

    Reinstall Camshaft Sprockets and Time Engine
    Verify crankshaft is still at TDC for cylinder #1. Align camshaft sprockets with timing marks on timing cover (or reference marks on chain if marked during removal). Hold each camshaft steady with wrench on hex section and install sprocket bolts, torquing to specification. Install both timing chain tensioners with tensioner pins or clips installed to keep them compressed. Remove pins/clips after tensioners are bolted in place, allowing chain tension. Verify all timing marks align correctly. Rotate engine two complete revolutions by hand and recheck timing mark alignment.
    Torque spec

    Camshaft Sprocket Bolts80 Nm (59 lb-ft)

    Timing Chain Tensioner Bolt25 Nm (18 lb-ft)
16. 16

    Install Timing Cover
    Clean timing cover mating surfaces thoroughly. Install new timing cover gasket or apply RTV silicone bead as specified by OEM procedure (typically 3mm bead in cover groove). Install timing cover and hand-start all bolts. Tighten 8mm timing cover bolts to specification in proper sequence (typically center-outward pattern). Allow RTV to cure per manufacturer instructions before adding coolant if RTV was used.
    Torque spec

    Timing Cover Bolts - 8mm25 Nm (18 lb-ft)
17. 17

    Reinstall Accessory Drive Components
    Reinstall A/C compressor and torque mounting bolts to specification. Reinstall power steering pump and torque mounting bolts. Reinstall alternator. Install belt tensioner assembly. Install new serpentine belt following routing diagram (typically found on fan shroud or radiator support).
18. 18

    Install Exhaust Manifolds
    Clean exhaust manifold mating surfaces on cylinder heads. Install new exhaust manifold gaskets. Apply anti-seize compound to exhaust manifold stud threads. Install exhaust manifolds and start all nuts finger-tight. Torque manifold nuts to specification working from hot (center) positions toward cold (outer) ends to prevent warping. Install heat shields if equipped. Reconnect exhaust pipes to manifold collectors with new gaskets.
    Torque spec

    Exhaust Manifold Nuts30 Nm (22 lb-ft)
19. 19

    Install Intake Manifold
    Install new intake manifold gaskets on cylinder heads, ensuring proper orientation and alignment with ports. Carefully lower intake manifold assembly into position, seating it evenly on both banks. Install all intake manifold bolts and torque in proper sequence (center-outward pattern) to specification. Reconnect fuel rails ensuring retainer clips fully engage. Reconnect throttle cable and adjust if necessary. Reconnect all vacuum lines and electrical connectors per photographs taken during disassembly.
    Torque spec

    Intake Manifold Bolt25 Nm (18 lb-ft)
20. 20

    Perform Valve Lash Adjustment
    This engine uses hydraulic roller lifters and does NOT require valve lash adjustment. There is no adjustable pushrod seat and no lash specification. Rocker arm/shaft assemblies are simply torqued to specification per Step 14. Verify each rocker was installed with its cam lobe on the base circle and confirm all pushrods rotate freely. No feeler-gauge lash check is performed on this engine.. Recheck lash after adjustment. Repeat for all 20 valves.
21. 21

    Install Valve Covers and Final Assembly
    Install new valve cover gaskets in valve cover grooves. Apply small dab of RTV at camshaft cap corners where gasket meets. Carefully position valve covers on heads, ensuring gaskets remain in place. Install valve cover bolts and torque in sequence (center-outward) to specification. Install all ignition coils and reconnect coil connectors. Reconnect PCV and breather hoses. Install air intake system. Install new engine oil filter and fill engine with correct quantity of fresh 0W-40 synthetic oil. Refill cooling system with Zerex G-05 HOAT coolant. Reconnect negative battery cable. Install engine covers and belly pans.
    Torque spec

    Valve Cover Bolts10 Nm (7 lb-ft)

Reassembly

1. Reassembly follows disassembly in reverse order with the following critical points:
2. Use only NEW cylinder head bolts - these are torque-to-yield and cannot be reused
3. Follow all torque specifications and sequences exactly as specified
4. Verify timing marks align correctly after camshaft sprocket installation and after rotating engine two full revolutions
5. Adjust valve lash to specification on all cylinders before final valve cover installation
6. All gaskets and seals must be replaced - do not reuse old gaskets
7. Allow RTV silicone to cure fully before filling cooling system if used on timing cover

Verification

• Before starting engine: Verify all electrical connectors are reconnected, all hoses are properly routed and secured, and no tools or rags remain in engine compartment
• Check that cooling system is filled to proper level and system has been burped of air pockets
• Verify engine oil level is correct on dipstick
• Perform initial start: Engine should start normally and idle smoothly without unusual noises, valve train clatter should subside within 15-30 seconds as oil pressure builds
• Check for coolant, oil, or exhaust leaks while engine is running at idle
• Allow engine to reach operating temperature and verify cooling fans cycle normally
• After initial warm-up cycle, shut down engine and allow to cool, then recheck cylinder head bolt torque (check for loosening) and retorque if necessary
• Perform test drive to verify normal power delivery and smooth operation through RPM range
• Recheck all fluid levels after test drive and inspect for any new leaks
• After 500 miles, recheck valve lash adjustment and adjust if needed - new valve seats may settle slightly during break-in

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