VEHICLES, CAMPERS, and BOATS > Powerplant, Driveline, and Braking

Head gaskets...

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Flyin6:
For my 6.0 LQ4 engine build with 243 heads, which head gaskets should I be looking at?

The 243 heads bump my compression from 9.5 ish up to around 10.5. A milling of the head or the thinner head gaskets will push that to 10.7 or the combo of both to 11.0:1

I was thinking of the Cometic gaskets...

TexasRedNeck:
You’re getting into super unleaded territory there Big Don.


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Flyin6:

--- Quote from: TexasRedNeck on December 18, 2018, 01:12:21 PM ---You’re getting into super unleaded territory there Big Don.


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--- End quote ---
Because of the excellent chamber design of these LS motors the onset of detonation is somewhat delayed from what I understand. That means that my motor, a stock LQ4 runs 10:1 CR (I incorrectly called it a 9.5CR earlier) and eats 87 octane. A 10.7 motor will live on regular as well, but does become a tiny bit timing sensitive. You can run more advance with 93 octane and therefore extract more horses per stroke.
I plan to polish the combustion chambers to a mirror to hold off the demo demons as long as possible.

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