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cylinder head flatness tollerance?
#1
cylinder head flatness tollerance?
anyone know the tolerances for flatness/ evenness of a cylinder head using an MLS gasket? Off the top of my head i think the absolute max is .003" but i could be wrong. any one know?
#2
just got off the phone with felpro tech line. if anyone wanted to know the answer to the question its is as follows (per felpro tech line rep):
Front--------------------Rear
allowed .001" per combustion chamber, so 4 chambers per head= .004" max tollerance
Up
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| max tolerance is .001"
down
these are the absolute max tolerances. from experience i have run a .003" front to back tolerance (head was a little warped) and the head sealed up fine, not sure i would ever go past that though
Front--------------------Rear
allowed .001" per combustion chamber, so 4 chambers per head= .004" max tollerance
Up
|
| max tolerance is .001"
down
these are the absolute max tolerances. from experience i have run a .003" front to back tolerance (head was a little warped) and the head sealed up fine, not sure i would ever go past that though
#5
Blocks are basically the same so the same numbers should apply. As I recall, there is a second number side to side but I can't remember the value. Thought it was 0.001" but am not positive about that.
#6
Surface finish is also important. Modern mls gaskets need a smooth finish.
I found that out the hard way after having my heads cut in old school machinery.
I think .002" or less for heads. I was at .003" and had issues.
I found that out the hard way after having my heads cut in old school machinery.
I think .002" or less for heads. I was at .003" and had issues.