Head Gaskets - Both

Complete removal and replacement of cylinder head gaskets on both banks of the 8.0L V10 engine, including removal of intake manifold, exhaust manifolds, valve covers, and cylinder heads.

Warnings

Tools required

Parts

• Cylinder head gasket (left bank) × 1 — Use OEM specification
• Cylinder head gasket (right bank) × 1 — Use OEM specification
• Cylinder head bolt set (20 bolts) × 1 — TTY bolts - replace all
• Valve cover gasket (left) × 1 — Use OEM specification
• Valve cover gasket (right) × 1 — Use OEM specification
• Intake manifold gasket set × 1 — Use OEM specification
• Exhaust manifold gasket set × 1 — Use OEM specification
• Coolant × 24 — Ethylene glycol 50/50
• Engine oil × 11 — 10W-30 conventional
• Oil filter × 1 — Use OEM specification
• Oil drain plug crush washer × 1 — Use OEM specification
• Spark plug tube seals (if equipped) × 1 — Inspect and replace as needed

Fluids

• coolant — 24 qt
• engine_oil — 11 qt

Preparation

1. Position vehicle on level surface and engage parking brake
2. Disconnect negative battery cable and isolate it away from battery post
3. Allow engine to cool completely (minimum 4 hours)
4. Remove engine cover if equipped
5. Relieve fuel system pressure by removing fuel pump relay and cranking engine until it stalls
6. Drain cooling system completely by opening radiator drain cock and removing radiator cap
7. Drain engine oil and replace drain plug with new crush washer
8. Photograph or diagram all electrical connectors, vacuum lines, and hose routing for reference during reassembly
9. Label each component and hardware with its location using paint pen or tags

Procedure

1. 1

   Remove Air Intake System
   Disconnect air intake tube from throttle body. Loosen hose clamps and remove complete air intake assembly including air filter housing. Disconnect the intake air temperature sensor electrical connector if present (the 1992 Viper uses a speed-density system with a MAP sensor, not a mass airflow sensor). Remove fresh air duct routing to front of vehicle.
2. 2

   Disconnect Fuel System and Throttle Linkage
   Disconnect fuel supply and return lines at fuel rail using appropriate quick-disconnect tools or wrench. Cap all open fuel lines to prevent contamination. Disconnect throttle cable from throttle body and bracket. Disconnect cruise control cable if equipped. Disconnect throttle position sensor and idle air control valve electrical connectors.
   ⚠Have shop towels ready to catch residual fuel from lines. Work in well-ventilated area away from ignition sources.
3. 3

   Remove Accessory Drive Components
   Remove serpentine belt by releasing tensioner. Remove alternator (disconnect electrical connections first) and set aside with wiring attached if possible. Remove power steering pump and secure aside without disconnecting hydraulic lines. Remove A/C compressor mounting bolts and secure compressor aside without disconnecting refrigerant lines. Remove accessory drive brackets as needed for clearance.
4. 4

   Disconnect Cooling System Components
   Disconnect upper and lower radiator hoses from engine. Disconnect heater hoses at firewall connections. Disconnect coolant bypass hoses. Remove thermostat housing and thermostat. Disconnect coolant temperature sensor electrical connectors. Cap or plug all open coolant passages to prevent debris entry.
5. 5

   Remove Ignition System Components
   Disconnect the ignition coil electrical connector. Remove the distributor cap and spark plug wires, labeling each wire with its cylinder number. The 1992 Viper uses a single coil and distributor ignition system, not individual coil packs. Remove spark plug wires from all 10 cylinders. Label each wire with cylinder number to ensure correct reinstallation. Remove spark plugs from all 10 cylinders and store in order. Inspect spark plug condition and note any cylinders showing abnormal combustion.
6. 6

   Remove Intake Manifold
   Disconnect all vacuum lines from intake manifold, marking each connection point. Disconnect brake booster vacuum line. Disconnect PCV valve and hose. Disconnect fuel injector electrical connectors (10 total). Disconnect fuel rail mounting bolts and remove fuel rail with injectors as assembly. Remove intake manifold mounting bolts working from outer bolts toward center. Verify the exact intake manifold bolt count against the factory service manual before removal. Carefully lift intake manifold from engine, noting any dowel pin locations. Inspect intake manifold gaskets and mating surfaces.
   ⚠Intake manifold is heavy and awkward. Use assistant or support device to prevent dropping and injury.
7. 7

   Remove Valve Covers - Both Banks
   Disconnect any remaining electrical connectors or breather hoses attached to valve covers. Remove valve cover bolts from left bank (10 bolts) and right bank (10 bolts). Carefully break valve cover seal and remove both valve covers. Remove and discard old valve cover gaskets. Inspect valve train for proper condition, wear, or damage. Cover open valve train area with clean shop towels to prevent debris entry.
8. 8

   Remove Exhaust Manifolds - Both Banks
   Working from underneath vehicle or with vehicle on lift, disconnect exhaust pipes from exhaust manifolds at flange connections. Remove oxygen sensor electrical connectors and carefully remove oxygen sensors from manifolds if they will interfere with removal. Remove exhaust manifold mounting nuts from left bank (8 nuts) and right bank (8 nuts). Remove exhaust manifolds and discard old gaskets. Inspect exhaust manifold mating surfaces on cylinder heads for warpage or damage.
   ⚠Exhaust manifold studs may be corroded. Apply penetrating oil and allow to soak before removal. Broken studs will require extraction.
9. 9

   Support Engine and Remove Engine Mounts
   Position engine hoist with load leveler attached to engine lifting eyes or brackets. Apply slight upward tension to support engine weight. Remove engine mount through-bolts on both sides. Raise engine approximately 2-3 inches to provide clearance for cylinder head removal. Ensure all hoses, wires, and connections have sufficient slack and will not be damaged. Secure engine in this position with hoist safety locks engaged.
   ⚠️Never work under engine supported only by hoist. Use additional jack stands or support fixtures as backup safety.
10. 10

    Mark Timing Reference and Remove Timing Components
    Rotate crankshaft to bring cylinder #1 to top dead center (TDC) on compression stroke. Mark timing chain position relative to camshaft sprockets using paint pen. Mark camshaft sprocket positions relative to cylinder heads. This ensures proper timing during reassembly. Remove distributor cap and rotor, noting distributor rotor position for correct reinstallation timing. On this pushrod engine, no timing chain removal is typically required for head gasket replacement, but verify camshaft gear alignment marks are visible and documented.
11. 11

    Remove Rocker Arms and Pushrods - Both Banks
    Loosen rocker arm mounting bolts on left bank (10 rocker assemblies, one per cylinder). Remove rocker arm assemblies and store in order. Remove pushrods (10 per bank) and store in numbered sequence in cardboard template or organizer tray to maintain correct position. Repeat process for right bank. Inspect all pushrods for straightness by rolling on flat surface. Inspect rocker arms for wear at pushrod cup and valve stem contact points. Cover lifter valley with clean towels to prevent debris entry.
12. 12

    Remove Cylinder Head Bolts - Left Bank
    Working in reverse of tightening sequence (outside-in pattern), loosen cylinder head bolts on left bank in three progressive passes. Remove all 10 cylinder head bolts and discard (TTY bolts must be replaced). Store bolts separately and label as 'left bank - DO NOT REUSE'. Inspect bolt holes in block for thread damage, debris, or oil contamination. Clean bolt holes with compressed air and vacuum.
    ⚠Do not attempt to reuse torque-to-yield head bolts. Stretched bolts will not provide proper clamping force.
13. 13

    Remove Cylinder Head - Left Bank
    Carefully break cylinder head seal by gently prying at designated pry points (typically cast bosses on head). Do not pry between mating surfaces as this will damage sealing surfaces. Once seal is broken, lift cylinder head straight up and away from engine block. Head weighs approximately 50-60 lbs - use assistant or lifting device. Place cylinder head on clean padded surface with combustion chambers facing up. Cover open cylinders in block with clean shop towels to prevent debris entry.
    ⚠️Cylinder head is extremely heavy. Use proper lifting technique and assistant to prevent back injury or dropped head.
14. 14

    Remove Cylinder Head Bolts - Right Bank
    Repeat cylinder head bolt removal process for right bank. Loosen 10 head bolts in reverse of tightening sequence (outside-in) in three progressive passes. Remove all bolts and discard. Label as 'right bank - DO NOT REUSE'. Clean bolt holes thoroughly with compressed air and vacuum.
15. 15

    Remove Cylinder Head - Right Bank
    Break cylinder head seal using same careful procedure as left bank. Lift cylinder head straight up and remove from engine. Place on clean padded surface. Cover remaining open cylinders in block with clean towels.
    ⚠️Cylinder head is extremely heavy. Use proper lifting technique and assistant to prevent injury.
16. 16

    Remove Old Head Gaskets and Inspect
    Carefully remove old head gaskets from both sides of engine block. Examine gasket failure pattern - note if failure is localized (indicating possible hot spot or coolant flow issue) or general deterioration. Check for evidence of head gasket leakage between cylinders, into oil passages, or into coolant passages. Photograph gasket condition for reference. Remove any locating dowel pins and set aside for reuse if in good condition.
17. 17

    Clean and Inspect Block Deck Surfaces
    Thoroughly clean both cylinder head deck surfaces on engine block using plastic gasket scraper. Remove all traces of old gasket material without scratching or gouging surfaces. Use non-metallic wire brush for stubborn deposits. Clean with brake cleaner or degreaser and wipe with lint-free cloth. Inspect deck surfaces for warpage using precision straight edge and feeler gauge. Maximum allowable warpage is typically 0.003 inch. Check for cracks, erosion, or deep pitting. Verify all bolt holes are clean and dry - run tap through threads if needed. Inspect cylinder bores for scoring or ridge at top of bore.
    ⚠Do not use metal scrapers or power tools on aluminum surfaces. Surface damage will prevent proper head gasket sealing.
18. 18

    Inspect Cylinder Heads
    Clean cylinder head mating surfaces using same careful procedure as block. Inspect head surfaces for warpage using straight edge and feeler gauge at multiple angles (lengthwise, crosswise, and diagonally). Maximum warpage typically 0.003-0.005 inch. Check for cracks between valve seats, around bolt holes, or in combustion chambers using dye penetrant or magnetic particle inspection if available. Inspect valve seats for burning or erosion. Check valves for proper seating and stem wear. Consider having heads professionally cleaned, inspected, and resurfaced at machine shop, especially if warpage is detected or engine had overheating history.
19. 19

    Install New Head Gaskets
    Ensure both block deck surfaces and cylinder head surfaces are completely clean and dry. Install new locating dowel pins if removed. Position new left bank head gasket on block deck surface, aligning all coolant and oil passages with block openings. Verify gasket orientation using 'UP' or 'FRONT' markings on gasket. Ensure gasket is fully seated on dowel pins. Repeat for right bank head gasket. Do not apply any sealant to head gaskets unless specifically required by gasket manufacturer instructions - modern MLS gaskets typically install dry.
    ⚠Head gasket orientation is critical. Installing gasket upside-down or backwards will cause immediate failure. Verify all coolant and oil passages align before proceeding.
20. 20

    Install Cylinder Head - Left Bank
    With assistant, carefully lift left cylinder head and position over engine block, aligning with dowel pins. Lower head straight down onto gasket, ensuring gasket does not shift position. Verify head is fully seated on dowel pins and gasket. Install new cylinder head bolts (10 bolts) finger-tight in all positions. Do not tighten at this stage.
21. 21

    Torque Cylinder Head Bolts - Left Bank
    Apply light oil to threads and underside of head of new cylinder head bolts. Torque head bolts in the factory-specified sequence and to the exact multi-stage torque and torque-angle values listed in the 1992 Viper factory service manual (verify all values before proceeding; do not use estimated figures).rque. Verify each bolt has been torqued by checking witness marks.
    ⚠Head bolt tightening sequence must be followed exactly. Incorrect sequence will cause head warpage and gasket failure. Torque angle must be precise - use dedicated angle gauge, not estimated.
22. 22

    Install Cylinder Head - Right Bank
    Repeat cylinder head installation process for right bank. Position head on gasket and dowel pins, install new head bolts finger-tight.
23. 23

    Torque Cylinder Head Bolts - Right Bank
    Apply oil to new bolt threads and underside of heads. Torque head bolts in the factory-specified sequence and to the exact multi-stage torque and torque-angle values listed in the 1992 Viper factory service manual (verify all values before proceeding). Verify all bolts torqued correctly.
24. 24

    Install Pushrods and Rocker Arms - Both Banks
    Remove protective towels from lifter valley. Lubricate pushrod ends with engine assembly lube or fresh motor oil. Install pushrods for left bank in their original positions, ensuring lower end is properly seated in lifter cup. Install rocker arm assemblies in original positions. Rotate crankshaft as needed to install each rocker with cam lobe pointing away from lifter (base circle). Torque rocker arm/shaft bolts to the specification listed in the factory service manual (verify value before assembly). Repeat process for right bank pushrods and rocker arms. Verify all rocker arms move freely and pushrods are properly seated at both ends.
25. 25

    Verify Valve Lash and Timing Marks
    Rotate engine two complete revolutions by hand to verify smooth operation and that all valves are operating correctly. Check that timing marks are still properly aligned if timing components were disturbed. On this pushrod V10, verify that all rocker arms are functioning and there are no unusual clearances or binding. Listen and feel for any unusual resistance while rotating engine by hand.
    ⚠If any binding or unusual resistance is felt while rotating engine, stop immediately and investigate. Improper assembly can cause catastrophic valve-to-piston contact.
26. 26

    Install Exhaust Manifolds - Both Banks
    Install new exhaust manifold gaskets on both cylinder heads. Position left exhaust manifold on head and install mounting nuts finger-tight. Torque exhaust manifold fasteners to the specification listed in the factory service manual, working from center outward. Repeat for right exhaust manifold. Install oxygen sensors with anti-seize on threads if removed. Reconnect exhaust pipes to exhaust manifold flanges using new gaskets. Torque exhaust flange bolts/nuts to specification.
27. 27

    Install Valve Covers - Both Banks
    Install new valve cover gaskets in valve cover grooves or on cylinder head sealing surface per gasket design. Ensure gaskets are properly seated in all locations. Position left valve cover on cylinder head and install valve cover bolts. Torque valve cover bolts to the specification listed in the factory service manual in sequence (typically center outward pattern). Do not overtighten - this will distort cover and cause leaks. Repeat process for right valve cover. Reconnect any breather hoses or electrical connections to valve covers.
28. 28

    Install Intake Manifold
    Install new intake manifold gaskets on cylinder heads, aligning all port openings. Apply small bead of RTV silicone at front and rear block-to-head joints (china walls) if specified by gasket instructions. Position intake manifold on engine, carefully seating on all gasket surfaces. Install intake manifold bolts finger-tight (16 bolts). Torque intake manifold bolts to the specification listed in the factory service manual in proper sequence (typically center outward spiral pattern). Install fuel rail with injectors, torquing fuel rail bolts to specification. Reconnect fuel injector electrical connectors. Reconnect all vacuum lines to original positions using reference photos. Install PCV valve and hose. Reconnect brake booster vacuum line.
29. 29

    Install Ignition System Components
    Install spark plugs in all 10 cylinders, torquing to specification with new gaskets or seals. Install ignition coil packs in original positions (refer to labels), ensuring proper seating in valve cover wells. Reconnect ignition coil electrical connectors. Install distributor, cap, and rotor in original position, aligning rotor to the timing reference marked during disassembly.
30. 30

    Reinstall Cooling System Components
    Install new thermostat with new gasket or seal. Install thermostat housing and torque bolts to specification. Reconnect coolant temperature sensor electrical connectors. Reconnect coolant bypass hoses. Reconnect heater hoses at firewall. Reconnect upper and lower radiator hoses with new clamps if originals are worn.
31. 31

    Reinstall Accessory Drive Components and Lower Engine
    Reinstall A/C compressor mounting bolts and torque to specification. Reconnect A/C compressor electrical connector. Reinstall power steering pump and torque mounting bolts to specification. Reinstall alternator and torque mounting bolts to specification. Reconnect alternator electrical connections. Install accessory drive brackets if removed. Lower engine onto engine mounts using hoist. Install engine mount through-bolts and torque to specification. Remove engine hoist. Install serpentine belt following proper routing diagram.
32. 32

    Reconnect Fuel System and Throttle Linkage
    Reconnect fuel supply and return lines at fuel rail. Reconnect throttle cable to throttle body and bracket, adjusting for proper free play. Reconnect cruise control cable if equipped. Reconnect throttle position sensor and idle air control valve electrical connectors.
33. 33

    Reinstall Air Intake System
    Reconnect the intake air temperature and MAP sensor electrical connectors as applicable (the 1992 Viper uses a speed-density system with a MAP sensor, not a mass airflow sensor). Install complete air intake assembly including air filter housing. Connect air intake tube to throttle body and tighten hose clamps. Install fresh air duct routing to front of vehicle. Install new air filter. Install engine cover if equipped.
34. 34

    Fill Fluids and Prepare for Start
    Install new oil filter. Fill engine with approximately 8 quarts of 5W-30 motor oil (verify exact capacity against the factory service manual). Close radiator drain cock. Fill cooling system with 50/50 ethylene glycol coolant mixture (verify exact capacity against the factory service manual, approximately 11-13 quarts) through radiator fill neck and overflow reservoir. Reconnect negative battery cable. Install fuel pump relay. Turn ignition key to ON position (do not start) and cycle several times to prime fuel system and verify no fuel leaks. Check for any coolant leaks around head gasket areas before starting engine.
    ⚠Do not start engine if any fuel leaks are observed. Repair leaks before proceeding.
35. 35

    Initial Engine Start and Break-In
    Start engine and immediately verify oil pressure on gauge. Allow engine to idle and warm up to operating temperature while monitoring for any leaks at head gaskets, valve covers, intake manifold, or exhaust manifolds. Listen for any unusual valve train noise. As engine warms, cooling system will purge air - add coolant as needed to maintain proper level. Check for proper thermostat operation and heater function. After reaching operating temperature, shut off engine and allow to cool for 30 minutes. Re-check all fluid levels and top off as needed. Inspect all gasket areas for any signs of leakage.
    ⚠If oil pressure warning light remains on or gauge shows no pressure, shut off engine immediately and investigate. Do not run engine without proper oil pressure.

Reassembly

1. Reassembly is covered in the main procedure steps, performed in reverse order of disassembly
2. Always use new head gaskets, valve cover gaskets, intake manifold gaskets, exhaust manifold gaskets, and cylinder head bolts (TTY)
3. Follow exact torque specifications and tightening sequences for all critical fasteners
4. Allow engine to complete proper heat cycles before subjecting to heavy loads - avoid full throttle acceleration for first 500 miles

Verification

• Start engine and verify smooth idle with no unusual valve train noise
• Verify no coolant, oil, or fuel leaks at cylinder heads, valve covers, intake manifold, or exhaust manifolds
• Verify proper oil pressure reading on gauge (should show 25-80 psi depending on engine temperature and RPM)
• Verify cooling system maintains proper temperature and thermostat opens correctly
• Verify heater produces hot air at temperature control
• Test drive vehicle and verify normal power and performance with no misfires, overheating, or oil consumption
• After 500 miles of operation, re-inspect all gasket areas for any signs of seepage or leakage
• Monitor oil level between changes - new rings may use small amount of oil during break-in but consumption should stabilize after 1000 miles

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