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Thread: 87 Octane LS Chevy Engine ??
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11-12-2008 #2
New to Pro-Touring
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- Jun 2007
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87-octane LSx
My wife runs 87-octane in her 5.3 Tahoe all the time and it runs great with no signs of knock under any circumstances.
The LQ4 6.0 liter's have just as low compression as the 5.3 so they could run on it also.
I don't think the higher compression LQ9 6.0 liter's or any LS1, LS2 or LS3 would work very well on 87-octane without custom tuning but they can run on it in emergency situations according to the owners manual for my LS1 car. The factory doesn't advise this for long term use so it must be way down on power.
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