install a Coen bolt in sprag in a 727. That is the weak link compared to the 904 from the factory. I don't see any 904's, 998's ,999'S behind big blocks. Wonder why they never used them in Big block cars? As I stated if you have a light weight race car, Use a 904. If your building a full interior all metal street car for passengers and packages in the trunk including a spare. Go with the 727.
Think of it this way. If your car was a heavy 4spd. would you install a 9 inch clutch or a 10 1/2 inch clutch. That's the difference. Shaft, Drum, and clutch diameter. The only thing the 904 has over the 727 is the riveted in sprag. And lighter recipricating weight plus ratio. Installing a bolt in sprag is a must on either for safety. Just that the 904 has the holes 727 you have to drill them.
