Most engines use head gaskets for which the gasket makers specify a surface finish of 50Ra or better. Some gaskets are OK for 80Ra or better. This is for both cast iron and aluminum surfaces.
So....in looking at Ebay I see two basic types of meter / gages....the sort that looks like a dial indicator and the type that costs more and is more of a 'black box'.
Does the black box type work better or is it just fancier? Do either of these accurately measure finishes in the 50Ra range? I looked at the specs and it wasn't readily apparent to me.
Thanks!
So....in looking at Ebay I see two basic types of meter / gages....the sort that looks like a dial indicator and the type that costs more and is more of a 'black box'.
Does the black box type work better or is it just fancier? Do either of these accurately measure finishes in the 50Ra range? I looked at the specs and it wasn't readily apparent to me.
Thanks!
