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Message: <blockquote data-quote="DMarts10" data-source="post: 4530" data-attributes="member: 302"><p>I guess my first question should have been what motor are these heads going on. I assume you have an lq4 motor as you referred to dished pistons. Installing these heads on an lq4 would yield a lower compression than when the heads were on a stock trailblazer ss motor, because that motor, although similarly a 6.0, is a lq9, with flat top pistons (creating a higher compression). So by decking the heads 30 thousandths you hope to achieve the stock trailblazer ss compression. My personal opinion is to not deck the heads. Those heads are as valuable as the entire motor from my experience. I would look to build the bottom end in the future and use whichever piston you please to achieve the compression you want. There is no turning back once you plane those heads. I decked the heads on my current lq4 build to bump compression, but they are 706s that I got for free. I plan on picking up 243s and procharging the car one day, to take full advantage of the dished pistons.</p></blockquote><p></p>