PAC valve springs

imca77

Rookie
can someone explain if I have a set of PAC valve spring on a motor,how are they able to check springs at tech and determine that they are in fact PAC springs,and not factory GM crate springs ? any tech guys out there that can explain this to me ? thanks.
 

m15mod

Veteran
I haven't seen any to tell you 100% but here are a couple of things. Wire diameter, free length, surface finish, seat and open pressure.
 

sidebite

Rookie
I hear they can tell right away because the color and texture is different than GM springs. Just buy the rated GM sets and change them often.
 

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