May 19, 2016, 07:12 PM
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cylinder head flatness tollerance?
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?
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
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.
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.
