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Question on previous owner using 87 octane

Old 12-04-2005, 04:22 PM
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Question on previous owner using 87 octane

I know you're not supposed to use 87 octane in the LT1, I use nothing but 93 and 94 for my car. But, when I purchased the car from the previous owner, she said she used 87 once in a while [she had other cars to drive, so I know this car was a good day driver. And I know the car was babied, was almost mint condition with only 29k on it]. I've since done the usual tune-up since purchase [new plugs, oil change, tranny fluid. Haven't gotten new wires yet since I'm waiting to get the OVC wires for the LT's].

When I drive the car, even when driving hard, I do not feel any loss of power or anything peculiar or weird sounds. Just wondering if there could have been any damage done to the motor from running 87 in it?
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Old 12-04-2005, 04:50 PM
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Re: Question on previous owner using 87 octane

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Old 12-04-2005, 05:13 PM
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Re: Question on previous owner using 87 octane

If it runs on 87 and your not getting any knocking,then run 87 and save the change for performance parts.
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Old 12-04-2005, 06:00 PM
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Re: Question on previous owner using 87 octane

If it runs on 87, you may not hear any knocking, but you are losing performance. It will be running with a lot of knock retard. And that is what protected the engine from damage when the previous owner used the low grade fuel.
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Old 12-04-2005, 08:35 PM
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Re: Question on previous owner using 87 octane

The LT1 will run on 87 without hurting it. But it will be retarding timming due to knock, and therefor loosing power. I run 89 in my 94 and have no knock retard at all. I've verrified this several times with a scanner.
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Old 12-04-2005, 09:00 PM
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Re: Question on previous owner using 87 octane

Don't worry about it.
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