RE: Rule Addendum for Valve Insert Dimensions

All Posts, AWSR

All car owners, drivers, engine builders, technical officers and officials need to be made aware of the following change to the current supplementary rules effective immediately.

Rule 11.3 Cylinder Heads Part Section (d) 

The dimensions of the insert to be used:

OD 1.567 inches or (39.8mm) maximum

ID 1.185 inches (30.1mm) maximum

Thickness is .218” (5.53mm)

Details on AWSR recommended supplier please contact State Technical Representative or AWSR Technical Committee

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