sam2007
Veteran Member
OEM spec for head valves protrusion from head gasket surface side. could someone help me need this UNMOLESTED OEM measurement.thanks
Being a little facetious ......... not much! But, on the otherhand, it doesn't matter as long as they don't touch the pistons.
Quick story;
A friend of mine had the head from his 98 NB milled. The shop that done the milling cut it too much and also used a dull cutter. Well, I took the head to a nearby town with a very reputable machine shop. They wet ground the head to clean it up. Well, at that point, it was cut to the max....... in fact, we actually cut the valve seats and the valves just a little to move them away from the pistons. I also ground a little off the ends of the valve stems (not recommended) to account for them seating deeper in the head (could have affect the lifters, otherwise)
That has been about five years ago. The last I heard, that NB was doing just fine.
.020" I believe
PM 'Franko6'. He will know.I know this is an old post but for any one wondering for future reference my machine shop told me the max allowable valve protrusion is 0.025"