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Highest compression you can get away with on stock LS3?

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Highest compression you can get away with on stock LS3?

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Apr 19, 2013 | 12:26 PM

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Highest compression you can get away with on stock LS3?

What's the highest compression you can get away with on a stock LS3? Using 93 octane, at sea level.

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Apr 19, 2013 | 02:13 PM

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A stock LS3 has 10.7. Are you talking about shaving the heads? As far as LS engines in general, Ive heard of guys getting away with close to 12 to 1 WITH a spot on tune.

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Apr 27, 2013 | 01:45 AM

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bigger cams allow for more compression also.....

You can run 11.25-11.5:1 on 91 octane.... so I would say close to 12:1 as well with 93.

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Apr 27, 2013 | 08:56 AM

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I'm stroke at 12.2 but I have a big cam to bleed it off a Lil on 93 octane.

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Apr 29, 2013 | 08:11 AM

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It's a balancing act with the LS3 heads. Too much CR and you can't crank in enough timing to make power. I ran 12:1 and could only run 24-25 degrees of lead. At 11:4, I ran 29 degrees and made more power. These heads LOVE timing.

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121, 91, 93, compression, highest, idle, ls3, octane, run, timing

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