Re: Lifter re-ginding or turning
Yes, they are ground with a convex face and the cam has a slight taper so that the lifter will rotate. As the lifter wears, the face will become flat or even concave, and at that point, the lifter/Cam combo won't last much longer. Since I have access to a CNC lathe, I can program a convex radius and re-machine the face to be used with a new or nicely used cam. This is a big problem with original flat tappet GM cams as they tend to wear quickly even with stock valve springs. My survivor 69 Z-28 had some concave lifters after 44K miles with the tops of several cam lobes starting to wear. I plan on trying to re-machine used lifters and see how they work. I had heard the lifters were ground on a 12-18" radius but need some verification. I could measure some new GM lifters on a surface plate with a height gauge to see how much higher the center is than the edge. Then do a cad layout to determine the radius.
Paul
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70 Camaro LA Z-28 03B Citrus Green LT-1 M-40 3.73's
69 Camaro X-77 Z-28 10C Cortez Silver M-21 3.73's Deluxe Project X - SOLD
69 Camaro X-77 Z-28 01B Garnet Red w/Black top, M-20 3.73 Deluxe Houndstooth
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