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MikeK · 02-20-2013, 04:04 PM

The effect of milling the head is minor, just a few tenths increase. HC heads have a different, significantly smaller volume chamber geometry. Here's one that I am currently using, about 117.5cc. Stock is well over 200cc. Compare the shape to a stock head.

02-20-2013, 04:04 PM	#3
MikeK Senior Member Join Date: May 2010 Location: Windy City Posts: 2,919	Re: high compression heads The effect of milling the head is minor, just a few tenths increase. HC heads have a different, significantly smaller volume chamber geometry. Here's one that I am currently using, about 117.5cc. Stock is well over 200cc. Compare the shape to a stock head.