The small block Chev is an easy one to figure out how much to remove from the intake manifold face to match your shaved heads. Since the heads intersect the block at 90 degrees and the intake face is also at 90 degrees you would remove exactly half the amount off of each intake face.
For example, if you shave the heads or block 0.010" you would have to remove exactly 0.005" from each intake manifold face to retain the original orientation. This only applies to engines that have 90 degree gasket surfaces.
To do engines with less or more than 90 degree gasket faces use this simple formula,
For a 60 degree V6 with 0.010" shaved from the head: TAN 60 X (0.010" / 4) = 0.0043" from each intake manifold face.
Just remember to check the manifold faces to be sure you have the correct angle, not all engines have 90 degree gasket faces.
Hope this helps.
[ April 24, 2002: Message edited by: 4 Jaw Chuck ]</p>
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo