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Has anyone on here had work done on their stock heads like Porting and Polishing or Milling? If so how much did it cost and what kind of gains did you see?
 

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HOT AIR BALLOON OWNER
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I haven't seen it done for the 4.8/5.3 often as it's not really worth it. For the cost of some really worked up heads, you can drop in a 6.0 with better heads already...

I think gains are in the 20-30rwhp only. Not much to write home about really for the cost.
 
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