Cam Bores in Block: 1.9695 / 1.9680
Cam Journals: 1.9654 / 1.9649
That gives a clearance of 0.0026" for the maximum material conditions and a clearance of 0.0046" for the minimum material condition. Frankly, that 0.0046" value is higher than I expected.
I'll call the machinist tomorrow and ask that he measure the cam bores in the block for me paying particular attention to (and looking for) an oval vertical shape. I'll take the cam to work and borrow mics to measure it. All I have at home are calipers and while I can usually get consistent readings with them, I'd rather not trust them for anything more than screening on engine parts.
Again, thanks for pointing this out. Cam bearings are about $40. Goodness knows what I will be charged if he has to bore the block and install them.
Doug L.
--Previous Message--
: When you check the housing bores, it's
: just like any other housing bore, check
: & note the diameter around multiple
: points inside the bore.
: You'll probably find the wear in a
: vertical plane, ie very slightly
: oval/oblong. If so you will have to
: know how much, and approx how many
: degrees of the bore is out of spec.
: You can save a very slightly worn block
: by fitting bearings, but once you get
: over .005 clearance in there, say bye
: bye to idle oil pressure.
: This is exactly why some folks have
: problems with freshly
: "rebuilt" engines.
: Mic everything.
: Keep us posted,
: Glen
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