35.6mm(1.4") longer exhaust valve for the 2012 on 8 port head only
for use with special guides these are plasma heat treated to eradicate premature wear from unleaded petrol--For earlier heads see C-AHT376/7 valves.
Valves now longer and give a correct fitted length of 1.350" with our c-AEA526 spring---for more radical type race cams when
C-AEA527 springs might be used the fitted length is 1.440.
C-AHT376 & 377 early 8 port valve length 3.870" 98.298mm
New 8 port, from late 2012 length 3.933" 99.898mm