[Shotimes] +20 cam valve noise

[bjshov8]

Well, yes and no.  As I recall from my years of stuffing mechanical lifter
cams in V8 chevies, a proper mechanical lifter cam is ground to provide a
transition, or "ramp", to take up the valve clearance before really getting
into the lobe.  I wonder if a regrind of our cams has this shape integrated
into it.


> The extra valve noise, I think, comes from the change
> in profile over the stock lobe.  The longer distance from
> the base circle to the lobe tip would have more impact
> than stock.  The tip of the cam lobe hits the shim like a
> hammer hits a nail.  Think of two hammers with different
> length handles. The "+20" hammer would hit the nail, or
> shim in this case, with more force.