I have seen several posts about milling both the top and bottom of the U-20
head. Tom's, point about the posts keeping the cam fairly well aligned got me
to thinking... when the top of the head is milled, is the sealing area for
the valve cover and the cam tower area cut? In my twisted world, they both
warp the same. If they are, how would know how much was taken off off a used
head? I assume you measure the total thickness from the bottom of the head
to the area where the valve cover seats. Also, I have had other aluminum
heads cut (Nissan L20B springs to mind) and never had my machinist mention
the top. Should it just be checked, or is milling the top and bottom of an
aluminum head a hard and fast rule? Or just the U-20? Can't imagine that.
Never know about these things!
Rick Stayner
69 2000
Harrisburg, Pa
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