Engine was already delivering 132hp without being completly mapped.
Untill engine started rattling atleast
Valve rocker got thrown away .. anyone ever had this before? Nothing broken it was just laying next to the valve ..
Yes, it happens with highlift cams if the geometry of the valve train has not been adjusted by machining the cam carrier...
If Carlsberg did Motor clubs, then IDMC would probably be the best motor club in the world.
The base diameter is smaller, otherwise it is not possible to make higher lift than 11,67mm on this engines. The other reason with small cams, that it was regrinder from oem cam.
What cam do you have? Measure the small diameter on your cam, measure the oem cam too, OEM-Tuning devided by 2 and you have the number how much must be grinded from the cam housing, that the cam will be closer to the rockers.
And is it fine?
With competition high lift cams at the 8v heads you must always use special cam spring washers and machine out under the washer otherwise you can not reach the 34mm fitted spring height.
It can be that enem compensate at the top hats, but I prefer to regular way what all the others are doing.
If you are fine with your setup why have you asked?
So it ìs safe to macine 4mm from under the valve washers?
problem was a seized exhaust valve