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Old 10-01-2007, 05:27 PM   #1
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Proper octane to use on a 305 TPI
My gas station has 93, 89 and 87 octane. Which gasoline should be used for a 90 Firebird Formula 305 TPI? I looked in the Pontiac manual but I didnt find the answer.
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Old 10-01-2007, 05:45 PM   #2
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Re: Proper octane to use on a 305 TPI
the lowest octane to avoid knock
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Old 10-01-2007, 05:48 PM   #3
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Re: Proper octane to use on a 305 TPI
87 should do fine on a stock motor.
Last edited by TexasSilhouette; 10-01-2007 at 07:32 PM. Reason: Incapable of operating a keyboard correctly
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Old 10-01-2007, 06:03 PM   #4
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Re: Proper octane to use on a 305 TPI
87 should do fine on a stock engine
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Old 10-01-2007, 07:13 PM   #5
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Re: Proper octane to use on a 305 TPI
Oops, I stand corrected. Not sure where the "9" came from. 87 should be fine.
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Old 10-01-2007, 07:13 PM
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