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Thread: Aligning inlet manifold after head machining

  1. 15th May 2013, 09:46 PM #1
    aRRon
    aRRon is offline Master
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    Aligning inlet manifold after head machining

    Does anyone know the calculation for how much to machine the inlet manifold after cylinder heads have been surface ground on a 3.9 V8?
    Also how do you measure how much has been removed form the cylinder heads in any previous surface grinds? Is there a standard dimension for cylinder head height or do you do a trial and error fitment of the manifold with engineer's blue or the like to see how well inlet ports align?
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  2. 16th May 2013, 01:01 AM #2
    PLR
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    G`day ,

    usual way is the material is removed from the inlet faces on each head .

    The people that ground/faced you heads should know the formula , if not i have it here in a book but would need to look it up .

    There are std measurements for head thicknesses , on each end corner you will see small flat pads , two tall and two short and it will depend on which 3.9 heads you are using as to the measurements , if you give the casting numbers they will say which you have as all heads can interchange as far as bolting up goes . Start will be ERC or HRC , etc.
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  3. 18th May 2013, 09:45 AM #3
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    ramblingboy42
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    do you take that much off the heads that it causes misalignment of the manifold? I can understand this with a race motor we built for drag racing but you would only be removing thousands of an inch off your heads wouldn't you?
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