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

1.5 rr vs 1.6 rr's on 280xfi 383 lt1...

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Old 04-24-2018, 09:24 PM
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Default 1.5 rr vs 1.6 rr's on 280xfi 383 lt1...
I am wondering how much of a power difference id see from upgrading from 1.5 to 1.6 rr's. Set up is LE heads, 280xfi on top of a 383 stroker.
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Old 04-24-2018, 09:34 PM
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unlike most cams published lift the XFI grind lift shown for its specs assume a 1:6 RR, not 1:5

I would, and did, get 1:6 RR with the XFI
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Old 05-01-2018, 12:12 AM
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1.6, all day long.......

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Old 05-01-2018, 09:31 AM
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The more demand for air, the more significant the gains will be.
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