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Part#ACHA 33L28 – Yella Terra Alloy head to suit the Holden Blue, Black and Red, 179, 186, 202 six cylinder Motors. This part number is for the HIGH compression complete assembly which comes with a 56cc 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%.

To learn more about the features of this head click here.

To learn more about fitting it to a red motor click here.