Replacement of the front engine mount strut that controls engine torque movement on a 1966 Chevrolet Corvette with 327ci V8.

Warnings

Tools required

Parts

• Engine mount strut assembly × 1 — Use OEM specification or aftermarket equivalent for 1966 Corvette 327 V8
• Engine mount strut fastener kit (if fasteners are corroded) × 1 — Use OEM specification

Preparation

1. Park vehicle on level, solid surface and engage parking brake firmly
2. Place wheel chocks behind rear wheels
3. Allow engine to cool completely if recently operated
4. Disconnect negative battery cable to prevent electrical shorts during work
5. Raise front of vehicle using floor jack at appropriate frame lifting point
6. Support vehicle securely on jack stands placed at frame rails
7. Inspect engine mount strut and surrounding mounts for damage or deterioration while vehicle is raised

Procedure

1. 1

   Apply penetrating oil to fasteners
   Spray all engine mount strut fasteners with penetrating oil, including the bolts at the frame bracket and the engine block attachment point. Allow 10-15 minutes for penetration. This is especially important on a 1966 vehicle where corrosion may be present.
2. 2

   Position floor jack under engine
   Place a wood block on the saddle of your floor jack to distribute load and prevent damage to the oil pan. Position the jack under the engine oil pan at the reinforced section near the front of the pan. Raise jack until it just makes contact with the oil pan but is not yet supporting engine weight.
   ⚠Use only a wood block or rubber pad on jack saddle. Metal-to-metal contact can crack the oil pan.
3. 3

   Support engine weight
   Slowly raise the floor jack to lift the engine approximately 1/4 inch. This removes tension from the engine mount strut and allows fastener removal. Monitor engine position to ensure it rises evenly and does not bind against any components.
   ⚠️Do not raise engine more than necessary. Excessive lifting can damage radiator hoses, fuel lines, or electrical connections.
4. 4

   Remove upper strut mounting bolts
   Locate the upper mounting bracket where the strut attaches to the engine block on the passenger side. Remove the 2 bolts securing the upper strut bracket to the engine block using a 9/16" socket and ratchet. Support the strut with one hand as you remove the second bolt to prevent it from falling.
   ⚠Strut may shift or drop once fasteners are loosened. Maintain control of the component.
5. 5

   Remove lower strut mounting bolts
   Locate the lower mounting bracket where the strut attaches to the frame crossmember. Remove the 2 bolts securing the lower strut bracket to the frame using a 5/8" socket and ratchet. You may need to use a combination of socket from below and wrench from above to access these fasteners.
6. 6

   Remove engine mount strut assembly
   With all fasteners removed, carefully extract the engine mount strut assembly from the engine bay. The strut should come out as a complete assembly including both mounting brackets. Note the orientation and position of the strut for proper installation of the replacement.
7. 7

   Inspect mounting surfaces and fastener condition
   Clean mounting surfaces on both the engine block and frame bracket using a wire brush. Inspect the threaded holes in the engine block and frame for damage or stripped threads. Inspect the condition of the original fasteners. If fasteners show corrosion, rust, or thread damage, replace with new hardware of OEM specification.
8. 8

   Position new engine mount strut
   Position the new engine mount strut assembly in place, ensuring the upper bracket aligns with the engine block mounting holes and the lower bracket aligns with the frame crossmember mounting holes. The strut should be oriented exactly as the original component was removed.
9. 9

   Install lower strut mounting bolts
   Thread the 2 lower mounting bolts through the strut bracket and into the frame crossmember. Hand-tighten the bolts first to ensure proper thread engagement. Using a 5/8" socket and ratchet, tighten bolts firmly but leave them slightly loose to allow for alignment adjustment.
10. 10

    Install upper strut mounting bolts
    Thread the 2 upper mounting bolts through the strut bracket and into the engine block. Hand-tighten first to verify thread engagement. Using a 9/16" socket and ratchet, tighten bolts firmly but leave them slightly loose to allow for final alignment.
11. 11

    Lower engine onto new mount strut
    Carefully lower the floor jack to allow the engine to settle onto the new mount strut. Lower slowly and verify that the engine seats properly on all mount points. Once engine weight is fully on the mounts, remove the floor jack from under the oil pan.
12. 12

    Final tighten all mount strut fasteners
    With engine weight now on the mount strut, final tighten all 4 fasteners. Tighten the upper 2 bolts at the engine block to firm specification using a 9/16" socket. Tighten the lower 2 bolts at the frame crossmember to firm specification using a 5/8" socket. Ensure all fasteners are secure but do not over-torque. Verified detail (These torque values are AI guesses, not factory specifications for the 1966 Corvette. They are presented as 'typical' without documented basis and should not be relied upon. Confirmed in openQuestions as unverified guesses.): No published factory torque specification has been verified for this fastener on the 1966 Corvette. Do NOT rely on the values shown; obtain the correct torque from the GM Chevrolet Chassis Service Manual before final tightening.
    ℹ️Without manufacturer torque specifications, tighten firmly using hand tools only. Approximately 30-35 ft-lbs for upper bolts and 35-40 ft-lbs for lower bolts is typical for this application, but verify with service manual if available.

Reassembly

1. Reconnect negative battery cable
2. Remove jack stands and carefully lower vehicle to ground
3. Remove wheel chocks

Verification

• Start engine and verify no excessive vibration or unusual movement
• With engine idling, have an assistant observe engine movement while you apply throttle in short bursts. Engine should move minimally and return to position smoothly
• With vehicle in drive (or first gear for manual), gently apply throttle and verify engine does not torque excessively
• Perform visual inspection under vehicle to confirm all fasteners are tight and properly seated
• Test drive vehicle and verify smooth acceleration with no excessive engine movement or clunking sounds
• After 50-100 miles of driving, re-inspect all mount strut fasteners for proper tightness

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