LT1-LT4 Modifications 1993-97 Gen II Small Block V8

13.3:1 to high for 97 octane???

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Old Jun 1, 2021 | 04:26 PM
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From: Cuyahoga falls ohio
Default 13.3:1 to high for 97 octane???

Can anyone tell me what the minimum octane requirement would be for an lt4 with 13.3:1 compression?

I know the reverse flow cooling system will help with this but not sure if it is enough.

I have found 97 at a local gas station but the next step is $8 gal race fuel.

If 97 will not work what ratio of 97 would I have to mix with 110?
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Old Jun 8, 2021 | 12:58 AM
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Originally Posted by 97ta388stroker
Can anyone tell me what the minimum octane requirement would be for an lt4 with 13.3:1 compression?......
What cam you runnin'?

KW
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Old Jun 8, 2021 | 07:44 PM
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Lt4 hot cam.
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Old Jun 17, 2021 | 10:31 PM
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Originally Posted by 97ta388stroker
Can anyone tell me what the minimum octane requirement would be for an lt4 with 13.3:1 compression?

I know the reverse flow cooling system will help with this but not sure if it is enough.

I have found 97 at a local gas station but the next step is $8 gal race fuel.

If 97 will not work what ratio of 97 would I have to mix with 110?
If you have E85 available in your area, that compression will work fine with that fuel, it’s 105 octane, resists detonation, and it’s cheap. Are you building a new engine? If so any reason you are running the Hotcam? It may not have the later intake opening needed for that compression on pump 97? Much better options available, especially if you go custom.
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