What is your question?
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What is your question?
Are 3.1 in a 1993 Cutlass Supreme and a 1993 3.1 Lumina non interference engines?
1 Reply
The 3.1 GM engines have timing chains But if it breaks the valves will hit the pistons and cause damage
Unless it's noisy or affects performance no replacement is required just change your oil and filter regularly
How often should they be replaced?