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B20b cam change 140-160 1969

Are they the steel and steel gears, or the aftermarket steel and aluminum? The Volvo steel gear pair are usually so quiet you can't tell they are in there. I've thrown away the one set of steel and aluminum I ever used, for whine and installed the stock fiber gears instead.
Did you check the backlash on the gears? .005 inch is good.
They may wear in a bit and become quieter, but wearing in is no replacement for quality machining.






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