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Originally Posted by kris
Even with the head milled, and a 3 layer, I still only get close to 12.1:1 But I'm not going to sit and argue over .4 tenths of a copression point. 
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use the zealautowerks compression calc. its the most accurate. the cspeed one isnt fully accurate. p30's on ls rods is 12.18 on its own. then plug in 1k for the milling. zeal's uses the right piston to deck heights unlike cspeed.
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