Quote:
Originally Posted by d.j. moordigian
Hello Brent,
Best guess,...it could be as high as 20 pounds..PLUS the spring doesn't
seat well ! Also,..I think that the one piece guides should have "liners"
installed,...that makes them bomb proof..
djm
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Hey Dudley, you are in the ballpark for sure.
I am not sure about the K-liner approach due to substantial costs and extra labor without much reward. The biggest gain in that area would be if I had a machining center where the hole could be correctly located in reference to tappet bore and seat opening.
As a side-note, I do know that the concentricity of many of the new valves are off requiring at least half of the faces to be re-ground before use. I generally see from 0.0020 - 0.0080 in variance straight out of the box. My older SVS2 can generally get around 0.0005 - 0.0007 on them after grinding, so while not perfect, it is a far cry better.
As I know you know all too well, it seems a good concentricity seat gauge is about a must to get a good seat seal, and most engine rebuilders likely do not own either gauge nor do they check them. Most people never realize that a portion of the performance in their newly-rebuilt Model-A engine is escaping past poorly bored cylinders and leaky new valves. I would be interested in your opinion but I would guess a 10% loss in performance is likely. Thoughts???