[William Miller]

Charlie,

The CIS pistons have a flat spot around the edges simular to what is in your picture. I ignored this because like an ape, I have been doing what Wayne recommended in his book instead of thinking. Wayne has a tendancy to write many things down twice with different terminology in different places. Maybe that's just me reading. I think your's right on the money he is describing how to measure the clearance between the top of the cylinder and the piston. I think in the same breath he is referring this to deck height.

As I undersand you and this certainly seems to make sence that the deck height is the difference between the top edge of the piston (If the piston is shaped like your's or mine.) and the top edge of the cylinder.

I looked at this, but did not measure it. My guess is that my deck height is about 1mm+.

In looking at your spreadsheet and your post it seems like I will be able to get an accurate measurement on deck height. What I don't know is the dome volume of my pistons. This is where I jumpped on board your thread (I think) Asside from some casting numbers I can't Identify what pistons that are in my engine. I'm sure they are stock CIS Pistons, but didn't they come in 3 or more different CR's? for SC. I don't have my book, but I recall an 8.?:1 (Early CIS) a 9.3:1 (1980+ US CIS) and the 9.8:1 Euro set.

I guess the only real way to know is to take them back out and get them CC'd.

Can you think of anything else?
If not, I think it's time to button it up!

BTW I think wayne recommended the locktight 574 to seal the P base gasket. Some on both sides of it.