727 or 904?

Yes the 904 is quicker, about a tenth. However, it is small and has weaker parts because of it's physical size. It takes a little more to give it the strength the 727 already has. More and larger clutches gives more surface area for grip. If you do it right you can stuff "6" clutches and steels into a 727. Alum. forward drum will make your 727 spin faster, billet drum will make it stronger. 4-5 pinion carrier a must. Use the best bolt in sprag you can get. This combo will take a lot of power. There are a torrid of causes that can cause it to blow up! Not just the above mentioned parts. Install a safety device!!!!!! Why? Insurance company's are not going to cover you for a racing accident. Protection costs less than hospital bills !!!!!!!!!