06-23-2017, 10:30 PM
what was the compression, on all 4, exactly, done wet and dry, done Wide open throttle. (about) done spark plugs all out,, ive only questions... many,
was the lash at spec?
is/was the cam timing set right using only the "E" marks and never 'I" marks.
is the head removed? still now?
take it to any machine shop, and get it tested?
ever do a home method of test? head upside down,
using a safe solvent. put that in the chambers and see if it the solvent leaks to ports? (kerosene is pretty safe) or paint thinner. if does lap them in, now. if fail , Machine shop time.
unseen , I'd say 1.75 is ok, but most shops do 2 or 3 angle cut, so , do so? but margin and concentric sealing is top of list.
the 1.32mm max is really what we call margin, the too wide cut results in to much recession, and the edge of the valve, is now like knife, this causes it to glow red hot and burn
this margin rule is what matters most.
why not get the heat fully tested in a real machine shop. or since its all ready out, get it rebuilt. end the worry?
lots of premature causes, EGR dead, lash wrong, over cut super bad, now edges burned,
many valves dont like excessive cuts, as the harness is not as hard deep inside.
Engine ping.(& age)
20year old heads can be hard to rebuild.
water flow problems i the head. hot spots,at seats.
http://www.acksfaq.com/2016bp.php?urlnam...kerfsm.htm
was the lash at spec?
is/was the cam timing set right using only the "E" marks and never 'I" marks.
is the head removed? still now?
take it to any machine shop, and get it tested?
ever do a home method of test? head upside down,
using a safe solvent. put that in the chambers and see if it the solvent leaks to ports? (kerosene is pretty safe) or paint thinner. if does lap them in, now. if fail , Machine shop time.
unseen , I'd say 1.75 is ok, but most shops do 2 or 3 angle cut, so , do so? but margin and concentric sealing is top of list.
the 1.32mm max is really what we call margin, the too wide cut results in to much recession, and the edge of the valve, is now like knife, this causes it to glow red hot and burn
this margin rule is what matters most.
why not get the heat fully tested in a real machine shop. or since its all ready out, get it rebuilt. end the worry?
lots of premature causes, EGR dead, lash wrong, over cut super bad, now edges burned,
many valves dont like excessive cuts, as the harness is not as hard deep inside.
Engine ping.(& age)
20year old heads can be hard to rebuild.
water flow problems i the head. hot spots,at seats.
http://www.acksfaq.com/2016bp.php?urlnam...kerfsm.htm
http://www.fixkick.com