Cylinder Head Resurface

Remove, resurface, and reinstall cylinder heads on a 2008 Dodge Viper 8.4L V10, including valve train disassembly, head removal, machine shop preparation, and reassembly with new gaskets.

Warnings

Tools required

Parts

• Cylinder head gasket set (left and right) × 1 — Use OEM specification
• Valve cover gaskets × 2 — Use OEM specification
• Intake manifold gaskets × 1 — Use OEM specification
• Exhaust manifold gaskets × 2 — Use OEM specification
• Coolant temperature sensor O-ring × 1 — Use OEM specification
• Spark plugs × 10 — Use OEM specification
• Valve stem seals (if replacing) × 20 — Use OEM specification

Fluids

• 0W-40 full synthetic engine oil — 11 qt
• Mopar HOAT coolant 50/50 — 19 qt

Preparation

1. Park vehicle on level surface and engage parking brake.
2. Disconnect negative battery cable and secure away from terminal.
3. Remove engine cover if equipped.
4. Drain engine coolant 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 running engine until it stalls, then crank for 5 seconds.
7. Label all electrical connectors, vacuum lines, and hoses with tape and marker for reinstallation reference.
8. Take photographs of routing for ignition wires, hoses, and harness positions.

Procedure

1. 1

   Remove intake manifold assembly
   Disconnect throttle body electrical connector and remove throttle body. Disconnect fuel rail and injector electrical connectors. Remove fuel rail bolts and carefully lift fuel rail with injectors as an assembly. Disconnect vacuum lines, PCV hoses, and coolant hoses from intake manifold. Remove intake manifold bolts in reverse of tightening sequence (start from outside, work toward center). Carefully lift intake manifold away from engine. Inspect and clean mating surfaces.
2. 2

   Remove valve covers
   Disconnect ignition coil electrical connectors and remove all 10 individual coil packs. Remove valve cover bolts from both left and right covers. Gently pry valve covers loose using plastic pry tool at designated pry points. Remove valve covers and set aside. Remove and discard valve cover gaskets.
3. 3

   Remove exhaust manifolds
   Spray exhaust manifold studs and nuts with penetrating oil and allow to soak. Disconnect oxygen sensor electrical connectors. Remove exhaust manifold nuts from both left and right manifolds. Remove exhaust manifolds and set aside. Remove and discard exhaust manifold gaskets. Inspect studs for damage and replace if threads are stripped or studs are loose.
4. 4

   Remove rocker arm assemblies
   Using a permanent marker or scribe, mark each rocker arm shaft assembly with cylinder number and bank identification (left/right). Remove rocker arm shaft bolts in sequence from outside to inside to prevent shaft binding. Carefully lift each rocker arm shaft assembly as a complete unit. Place assemblies on clean workbench maintaining orientation. If individual rocker arms will be removed from shafts, mark each rocker arm position before disassembly.
5. 5

   Remove pushrods
   Remove all pushrods and place in numbered holder or cardboard template maintaining exact order and orientation. Mark each pushrod with cylinder number and position (intake/exhaust). Inspect pushrods for wear, bending, or damage. Roll each pushrod on flat surface to check for straightness. Set aside in protected area.
6. 6

   Remove cylinder head bolts
   Using breaker bar and appropriate socket, loosen cylinder head bolts in reverse of the tightening sequence (working from the outside inward, per the manufacturer's specified pattern). Remove all cylinder head bolts from both heads. Inspect bolts for necking, stretching, or thread damage. If bolts show any signs of stretching or if specified as TTY by manufacturer, discard and obtain new bolts. Keep left and right bank bolts separated if reusing.
7. 7

   Remove cylinder heads
   Check that all bolts, hoses, and connections have been removed from cylinder heads. Gently tap cylinder heads with plastic mallet to break gasket seal. Insert non-marring pry bar into designated pry points (never between sealing surfaces) to lift heads. Carefully lift cylinder head straight up to prevent damage to deck surface. Support head weight properly - heads weigh approximately 50-60 lbs each. Place heads on wood blocks or head stands with combustion chambers facing up. Remove and discard cylinder head gaskets. Cover engine block openings with clean shop towels to prevent debris entry.
8. 8

   Clean and inspect cylinder head mating surfaces
   Using plastic or brass scraper, carefully remove all old gasket material from cylinder head mating surfaces. Do not use metal scrapers that could gouge aluminum surfaces. Clean surfaces with approved gasket remover solvent. Use compressed air to blow away debris from bolt holes and coolant passages. Inspect head surfaces for cracks, especially between valve seats and around coolant passages. Place straight edge across head surface and use feeler gauge to check for warpage. Measure in multiple directions. If warpage exceeds 0.004 inches across entire surface or 0.002 inches in any 6-inch span, resurfacing is required.
9. 9

   Prepare heads for machine shop
   If valve work is required, disassemble valve train using valve spring compressor. Compress valve springs and remove keepers using magnetic tool. Remove retainers, springs, and seals. Mark each valve with cylinder number and position before removal. Pull valves from combustion chamber side. Keep all components organized by cylinder location. Transport cylinder heads to machine shop with instructions for resurfacing amount needed based on warpage measurements. Request minimum material removal to achieve flat surface. Typical removal is 0.003-0.010 inches. If heads are warped beyond maximum cut limit (typically 0.020 inches total material removal over head life), replacement heads are required.
10. 10

    Clean engine block deck surface
    With cylinder heads removed, carefully clean engine block deck surfaces using plastic scraper. Remove all old gasket material without scratching deck surface. Clean bolt holes using thread chaser or tap to remove any thread sealant or debris. Use compressed air to blow out bolt holes completely - coolant or oil in blind holes will cause improper torque readings. Stuff clean shop rags into cylinder bores to catch any cleaning debris. Place straight edge across block deck and check for warpage using feeler gauge. If block deck warpage exceeds 0.002 inches, block resurfacing may be required (consult machine shop).
11. 11

    Inspect and clean additional components
    Inspect all pushrods for wear, scoring, or bending. Inspect rocker arms for wear on valve stem contact point and pushrod seat. Check rocker arm shafts for scoring or wear. Inspect lifters for scoring or flat spots (if accessible). Clean intake manifold mating surfaces thoroughly. Inspect intake manifold for cracks. Clean all bolt threads with wire brush. Apply light oil to all fastener threads unless thread sealer is specified.
12. 12

    Reassemble valve train in cylinder heads
    If valves were removed, reassemble valve train after heads return from machine shop. Install new valve stem seals on valve guides using appropriate driver tool. Lubricate valve stems with assembly lube or engine oil. Insert each valve into its original guide position. Install valve springs with closer-wound coils toward cylinder head. Install retainers and compress springs. Install valve keepers using magnetic tool, ensuring keepers are fully seated in valve stem grooves. After installing keepers, gently tap valve stem end with plastic mallet to verify keepers are locked in position.
13. 13

    Install cylinder heads
    Remove shop towels from engine block openings. Verify block deck and head surfaces are completely clean and dry. Position new cylinder head gaskets on block deck, ensuring correct orientation (gaskets are typically marked 'Front' and 'Left' or 'Right'). Align gasket dowel pins with block holes. Carefully lower cylinder heads onto block, guiding heads over dowel pins. Avoid sliding heads on gasket surface. Install cylinder head bolts finger-tight in all positions. Follow manufacturer's torque sequence and specifications for final tightening. Torque in multiple stages as specified (typically 3-4 stages). If torque-to-angle specification is provided, use angle gauge for final tightening stage.
14. 14

    Install pushrods and rocker assemblies
    Lubricate pushrod ends with engine assembly lube. Install each pushrod in its original location, seating ball end into lifter socket. Rotate crankshaft to position each cylinder at base circle (lifter on heel of cam lobe) before installing rocker assembly for that cylinder. Apply engine assembly lube to rocker arm contact points. Install rocker arm shaft assemblies in original positions with identification marks matching. Install rocker shaft bolts finger-tight, then tighten in sequence from center outward to prevent shaft binding. Torque rocker shaft bolts to specification.
15. 15

    Install exhaust manifolds
    Install new exhaust manifold gaskets on cylinder head studs. Position exhaust manifolds and install nuts finger-tight. Tighten exhaust manifold nuts in spiral pattern from center outward to specification. Reconnect oxygen sensor electrical connectors.
16. 16

    Install valve covers and intake manifold
    Install new valve cover gaskets in valve cover grooves. Position valve covers on cylinder heads and install bolts. Tighten valve cover bolts in sequence from center outward to avoid gasket distortion. Do not overtighten. Install new intake manifold gaskets. Position intake manifold on cylinder heads, ensuring gaskets remain in position. Install intake manifold bolts finger-tight. Tighten in proper sequence (center to outside pattern) to specification. Reconnect all coolant hoses, vacuum lines, and PCV connections to intake manifold. Install fuel rail with injectors, torquing fuel rail bolts to specification. Reconnect fuel lines and all injector electrical connectors. Install throttle body with new gasket if required.
17. 17

    Complete final assembly
    Install new spark plugs, torquing to manufacturer's specification (verify exact value in service manual for the 8.4L V10). Install ignition coil packs and reconnect electrical connectors. Reconnect all remaining electrical connectors, hoses, and vacuum lines using labels and photographs as reference. Install new engine oil filter. Refill engine with 0W-40 full synthetic engine oil (verify exact capacity against service manual, approximately 10.5 quarts). Refill cooling system with Mopar HOAT 50/50 coolant (verify exact capacity against service manual). Reconnect negative battery cable. Install engine cover if equipped.

Reassembly

1. Install components in reverse order of removal, using new gaskets and seals throughout.
2. Follow all manufacturer torque specifications and tightening sequences precisely.
3. Use engine assembly lube on all valve train components during installation.
4. Ensure all electrical connectors are fully seated and locked.
5. Double-check that all coolant hoses and vacuum lines are properly connected and secured with clamps.

Verification

• Perform visual inspection to verify all fasteners are installed and torqued, all electrical connectors are attached, and no tools or parts remain in engine bay.
• Check that oil drain plug and filter are tight and engine is filled to proper oil level on dipstick.
• Verify cooling system is properly filled and bled of air pockets.
• Prime oil system by cranking engine with fuel pump fuse removed until oil pressure gauge shows pressure (or warning light extinguishes).
• Start engine and immediately check for oil leaks, coolant leaks, fuel leaks, or unusual noises.
• Allow engine to reach operating temperature and verify cooling fans operate normally.
• Check valve cover, intake manifold, and exhaust manifold areas for any signs of leaks.
• Road test vehicle to verify normal operation, smooth idle, proper power delivery, and no warning lights.
• After 500 miles, re-torque cylinder head bolts if specified by manufacturer (many modern engines do not require this).
• Change engine oil and filter after 500 miles to remove any break-in debris.

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