Milling gen 4 heads?

SketchyPete

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Does anyone know how much can be taken off to increase compression on gen 4s?

I see threads about gen 3s but is there a reason this is not done on gen 4s?
 

Dan Cragin

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Gen 4's have a weak piston and can often fail from detonation. On our street performance engines with the .028 headgasket, compression was raised to
10.1, but 94 octane gas was required.
 
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SketchyPete

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I'm planning to change pistons to try to get to 11:1, 11:5:1, do you what cc the stock combustion chamber is?

10:1 seems low for 94 no?
 

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