Interesting following the comments. If you have a 7000 lb pickup truck and tow a trailer or a taxi putting on 100,000 miles a year, go with the 727. For all other applications, use a 904 or one of it's derivatives like the 998 or 999. I ran a reworked 998 in my race car for 9 years behind a good running 401 ( 8.86 @ 149 mph, 1.19 60 fts) with NO failures, this was with close to 700 hp averaging 200 passes per year. Questions, email me direct and I'll do what I can to help you out. Jim Mantle