LS6 Heads
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You would only need to mill them 0.023” to get back to the stock 61.15cc from the 64.45cc of the 243 heads. You could go ahead and mill them about 0.031 to get them down to 60cc and shouldn’t present any issues.
For nice round numbers, I would say either cut them 0.025” to get back close to stock or cut them 0.030” for a slight bump in compression. That with the better ports and larger intake valves should net a slight improvement. If you can get the heads for a reasonable price and don’t mind the work, why not do it?
For nice round numbers, I would say either cut them 0.025” to get back close to stock or cut them 0.030” for a slight bump in compression. That with the better ports and larger intake valves should net a slight improvement. If you can get the heads for a reasonable price and don’t mind the work, why not do it?
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