Shimming PRC springs?
04-28-2006, 08:28 PM
#1
Shimming PRC springs? I have a custom cam from Ed Curtis, and will be using PRC double springs. I called up Texas Speed and they sayed that shimming isn't required with their valve springs. I thought that shimming or not depended on the cam. Ed Curtis told me the preferred spring pressure is 140-145 on the seat, so should I shim them or not? Ed Curtis doesn't realy know the specs of the PRC valve springs, so assuming they have 130 at 1.800 they probably will need to shimmed .030" to get the pressures up to 145#. Does this sound right?
What should I tell the machine shop that is assembling them for me.
thanks
What should I tell the machine shop that is assembling them for me.
thanks
04-28-2006, 08:38 PM
#2
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Originally Posted by Jimmy P
I have a custom cam from Ed Curtis, and will be using PRC double springs. I called up Texas Speed and they sayed that shimming isn't required with their valve springs. I thought that shimming or not depended on the cam. Ed Curtis told me the preferred spring pressure is 140-145 on the seat, so should I shim them or not? Ed Curtis doesn't realy know the specs of the PRC valve springs, so assuming they have 130 at 1.800 they probably will need to shimmed .030" to get the pressures up to 145#. Does this sound right?
What should I tell the machine shop that is assembling them for me.
thanks
What should I tell the machine shop that is assembling them for me.
thanks
Steve
