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David 67HR Offline
#1 Posted : Sunday, 24 January 2016 3:35:46 PM(UTC)
David 67HR

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Are all 161 heads Hi Compression heads?
HK1837 Offline
#2 Posted : Sunday, 24 January 2016 4:08:05 PM(UTC)
HK1837

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There are basically 2 x red 6 heads for HD-HK excluding X2 and 186S. Small chamber (with H on them) and large chamber (with L on them).

Both heads appear on high compression engines so both are high compression heads, the H head is the 149/161 high compression head and the L head is the 179/186 high compression head.

The H head only appears on 149 and 161 (until used on LC XU1), but low compression 149/161 get the L head.
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