oh man the hr heads really? Hybrid vhr heads with rear block off plates for the vvel, 2 oil passages blocked off, hr lifters and intake cams and the hr pulleys and timing cover. revised combustion chamber cooling and intake and exhaust port geometries are where it's at. it would take so little work it's not funny. biggest thing is the revised spark plug area on the casting, smaller plug, the coolant is closer to it, they removed the big boss in the coolant jacket eliminating the hotspot between the valves....
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Last edited by 1slow370; 03-10-2011 at 03:55 AM.
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