'True' Factory Compression Ratio's

This is contradictory...

The fist piston spec says +.021" above the deck, then you say that they are below the deck from -.020" - -.035"...

The Factory lists that the Piston 'should' be at {+.021"} above the deck
with 'true' specifications.

But, that is 'not' the height that they left the Machining Division.

Most of the {1968 and 1969} 383/290 {2-Barrel} Engines were at {-.020"} below the deck when they left the Machining Division. Some Pistons were even further down in the Cylinder.