thanks guys, but I figured it out today. turns out it is the exhaust valve echoing loudly through the block when it closes. seems a little weird but, its not hurting anything.
-Randy
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Cubs: 2xOriginal, 100, 125, 2x127, 147, 128, 2x 66 Sears Suburban, 66 Sears Custom 6, 64 DB 725
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