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Part#ACHA 33C25 – Yella Terra Alloy head to suit the Holden Blue, Black and Red, 179, 186, 202 six cylinder Motors. This part number is for the LOW compression complete assembly which is intended for Turbo or supercharger applications. It comes with 72cc combustion chamber, 1.74 inlet valves, 1.550 exhaust valves , chrome molly retainers & valve locks, Crow valve springs with inner dampener to suit most streetable cams of lift up to half inch lift [500 thou]. You could expect a 50 horsepower gain over a standard Holden head and a weight saving of approx 33%.