Most common 512 low deck combo is the 4.25 stroke 6.535 BBC rod and a .990 pin flat top or dish piston with a 1.30-1.32 CH

This 517 low deck has a slightly longer 4.300 stroke (made from offset grinding a 4.15" crank). even with a D dish the motor is still 12:1. The Chapman CNC Max Wedge heads flow 380 cfm and the torque curve of this motor has been the best all-around motor I have personally ever seen...let alone built.

7506980-517SHORTBLOCK.jpg (439 downloads)
Last edited by Streetwize; 12/18/12 06:13 PM.