[snbush67]

Originally Posted by 304065

Wayne's book, as great as it is, does not do a great job of explaining this.

Your explanation is correct: deck height is the distance between the "deck" of the cylinder (the term originated long ago-- think about the cylinder head mating surface of a Model T iron block to visualize "deck") and the theoretical top of the piston WITHOUT THE DOME. Some JE pistons have a flat land machined into the edge of the piston to make it convenient to measure. Others, you have to measure then subtract the dome height. But it takes you to the same place.

Many confuse head-to-piston clearance with deck height which is only an accurate use of the term with a flat top piston. Think back to the Model T example. Or 930 turbo pistons. . .

Thanks for the explanation !

Would you also agree that actual deck height does not matter? And that the squish height is the only measurement that means anything?

And also can we agree that for now on deck height when referenced in the air cooled forums means the same thing as squish height?