Measuring Stroke

Stroke is measured from the center line of the crank bearing journal to the center line of the rod journal multiplied by 2.

Measuring Deck Height
Deck height is measured from the center line of the crankshaft bore to the deck of the block.

Measuring Compression Height        
Compression height is measured from the center line of the wrist pin bore to the top of the piston.

Calculating Cubic Inch Displacement (cid)
To calculate cubic inch displacement (cid):multiply bore x bore x stroke x .7854 Example: 2.562 x 2.562 x 2.437 x .7854 = 12.5633 cid 

Cid x 16.33 = CC

Rod Length & Compression Height - Made Simple

Calculating Rod Length
To calculate rod length : deck height - stroke divided by 2 - compression height. Example: 6.2863 - (2.437 / 2) - 1.190 = 3.875 rod length

Calculating Compression Height
To calculate compression height :subtract deck height - (stroke divided by 2) - rod length. Example: 6.2835 - (2.437 / 2) - 3.875 = 1.190 compression height