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Old 06-18-2019, 11:50 AM
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88falcon 88falcon is offline
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Fuel Grade

Hey all just curious on what grade or octane of fuel everyone runs in their 351s and 350s

I usually run ethanol free unleaded, and will occasionally mix some premium in, I honestly can't tell a difference in 87 or 91 octane.

Anyone have a preference and for what reasons?

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Old 06-18-2019, 11:53 AM
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I am running rec 90. Ethanol free 90 octane. It’s what we have locally.
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Old 06-18-2019, 11:54 AM
jharmon203 jharmon203 is offline
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Quote:
Originally Posted by 88falcon View Post
Hey all just curious on what grade or octane of fuel everyone runs in their 351s and 350s

I usually run ethanol free unleaded, and will occasionally mix some premium in, I honestly can't tell a difference in 87 or 91 octane.

Anyone have a preference and for what reasons?

Have a good day



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Use what's called for in your manual. I run mid-grade because that's what my engine's manual says to use. It typically what the engine is designed for.
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Old 06-18-2019, 11:56 AM
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Originally Posted by jharmon203 View Post
Use what's called for in your manual. I run mid-grade because that's what my engine's manual says to use. It typically what the engine is designed for.
My boats an 88 I don't have the manual.

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Old 06-18-2019, 12:00 PM
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Your motor is likely relatively low compression (<10:1) so 87 would be fine. Although it will run better with ethanol free.

I bet it would be even better on AV gas. 100 octane with lead.
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Old 06-18-2019, 12:03 PM
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Originally Posted by lakedrum03 View Post
Your motor is likely relatively low compression (<10:1) so 87 would be fine. Although it will run better with ethanol free.

I bet it would be even better on AV gas. 100 octane with lead.
That sounds expensive lol

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Old 06-18-2019, 12:03 PM
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I do run 87 octane ethanol free and havent had any issues I was just curious if others did anything different.
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Old 06-18-2019, 12:17 PM
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Quote:
Originally Posted by lakedrum03 View Post
Your motor is likely relatively low compression (<10:1) so 87 would be fine. Although it will run better with ethanol free.

I bet it would be even better on AV gas. 100 octane with lead.
$11 a gallon. Seems reasonable. Lol
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Old 06-18-2019, 03:20 PM
LDA6339 LDA6339 is offline
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$11 a gallon. Seems reasonable. Lol
But think of how much you save when your GPH goes down?
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Old 06-18-2019, 04:12 PM
curver900 curver900 is offline
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whatever is ethanol free is what i use anywhere from 91 to 93... I have only seen 87 once..
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