Valve shim strategy

[davidon]

If a measurement is right at the edge of a range what is the best policy?


Better to be on the loose end of the range for exhaust and tight for intake or other way around?

 

[falling]

Always go to the loose side. Both intake and exhaust. As the valve seats and faces wear, they get tighter. If you start a little loose, you get better sealing and heat transfer when the valve closes.


Sent from my iPhone using Tapatalk

 

[blaxmax]

+1

 

[Traumahawk]

Here is a good thread that covers this.

http://www.vmaxforum.net/showthread.php?t=40547

Several people commented that intakes will stay the same, and exhaust will tighten over time.

 

[caseyjones955]

A valve on the tight side spends less time seated in the seat = less heat dissipation. They also open to soon and close to late. In my experience with some engines minuscule valve adjustments can make a difference. A slight click is better than a burned valve if one must err in either direction.

Intakes get the benefit of a cool intake charge of air/fuel and the exhaust valves have to belch a hot firey mix of exhaust, I have replaced a lot more exhaust valves than intakes.