NEW March Pulley Set Big Block Mopar

They will fit without the Fluid Damper as long as your water pump flange to damper face is 3.5". To measure this put a straight edge on the damper face, then measure to the water pump flange. I actually mounted them to a cast iron water pump with a regular damper on a 340. This is the kit that March said I needed based on my measurements from WP to Damper. I have put AC on an early 340 with a cast iron water pump, so there were no kits or ready made pulleys available with exact spacing I wanted so I had a custom set made.