I took the head studs out when I got home. I was sort of hoping to find something wrong with them but they were still tight in the block with no sign of necking, cracking, or thread damage.
I was already working on a flange to bolt over the bores to do a "head off" leak down check. I picked up a piece of aluminum scrap from work and cut slots in it to pick up the head stud holes. I also picked up some -041 size o-rings to fit the spotfaces on top of the block. I had to plug a couple of holes in the plate and will do another leak down test sometime this weekend.
Doug L.
--Previous Message--
: Hmmm... I suppose that's good news in a
: way... but something is sure AFU.
: You can set the head on its side and
: fill the ports with mineral spirits
: etc, and see if the valves are leaking.
: A flat steel plate with an air chuck
: welded in over the bore also works well
: for checking leakdown with the head
: off.
: If it is indeed blowing down by the
: piston, there may be land or skirt
: damage. As the piston is forced up with
: the rope packing, it would tend to cock
: in the bore as the rope was compressed
: between the side of the piston top and
: the squish area flat part of the head.
: Whether this side load would be
: sufficient to collapse anything... I
: dunno... with enough force, something
: is going to fail
: I do know that at speed when there is
: metal contact, it makes a real mess;
: but in this case it's obviously a load
: issue only...
: Glen
:
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