1951 coupe flathead to C4 adapter
 

After much trial and error over the past year with my 51 clutch chatter I have thrown in the towel and found a 74 C4 had it rebuilt. Now I’m having trouble deciding on an adapter for my flathead. I have been on a waiting list fork over six months with Flatomatic. Gene has had health issues and problems sourcing torque converters. My question is Speedway has an adapter kit and everything I can purchase. How is it compared to Flatomatic? Or should I just be patient? I would like the opinion of you experts. This is my first Flathead.

Re: 1951 coupe flathead to C4 adapter
 

Having built and worked on a number of C-4 to flathead conversions its my opinion each conversion will work fine IF the time is taken to be sure on a couple of important details.

Its important to be sure the adapter you use is actually on the crankshaft centerline using a dial indicator to verify that detail would be important.. Also the flywheel is at times called a flex plate for a reason. The remanufactured toque converter you get with either conversion will have some run out. When I work on this type of conversion I verify and correct as needed that the converter has as little run out from the pump end to the pilot end. These two details when checked and corrected when needed will assure the complete conversion will work perfectly.
Ronnieroadster