73 258 compression test

hi
i just did a compression test {150,150,156,160,155,152}
what are the specs?
is this normal
also when i pulled the plugs after a high idle warm up they were a little chalky looking, what does that mean, thanks Larry:?

 

I don't know what the specs are but those are pretty good looking numbers from a consistency standpoint. Generally if all of your readings are within 10% of one another that's good, as long as they aren't really low and I don't think yours are.

 

Depends on how chalky. Here's a link to some spark plug photos:

http://www.4x4review.com/quads/tech/SparkPlugs.asp

There's plenty more on the web about this, just google.

 

Plugs should only be read after a sustained drive at normal speeds. Go for a drive around town or on the highway for a few miles, up to full operating temperature, and then read them.

IIRC 150 is good for a 258, and the consistency is good too.