Originally Posted by stu21t

i was changing the valve stem oil seals on my 4x4 cossie head yesterday when i noticed some1 has scratched some marks inside, they were on the exhaust side where the rocker cover goes.

it said
47cc
cmes

now i guess this means the size of the combustion chambers but what does it work out the comp ratio to be if i have std comp pistons?

and what does cmes mean?