Head Milling vs Compression

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Head Milling vs Compression

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Product Information

We usually only mill enough to make a head flat, but sometimes a customer wants more off to increase compression.   What exactly is there to gain?  Its a small sample size of 1, but we cut .010" off and measured.  Then did it twice more to see how it scales as you remove more.  The only note worth mentioning is the chamber was a little bigger than most/all of the other 3400 chambers that have been measured over the years.  28.6 is the norm.  This cylinder started at 29.4.  That aside, lets stop wasting time and get to the info!

  • Start at 29.4cc
  • .010" = 27.4cc
  • .020" = 26.4cc
  • .030" = 25.7cc

.030 isn't a typical amount to remove but was done to see how it scales.  Numbers alone aren't that useful, especially when you don't have the rest of the info to figure out compression. Lets fill in those blanks

  • Start at 9.53:1
  • .010 = 9.8:1
  • .020 = 9.94:1
  • .030 - 10.04:1

Port alignment, valvetrain geometry, and pushrod lengths are considerations as well when you remove a lot from the heads.  

Product CodeWOTCompArt

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