Jim B did a complete how-to article with nice pictures a few years ago on how to do this by rotary tooling off the aluminum, crimped pieces and using clamps. I did this on my Blazer using 2 high quality clamps on each end and have had no more leaks. I check them every 6 months or so for tightness.
Mark Chapman DP member #653;
1983 K2500 6.2 Suburban, 4" lift, 35" tires, ATS turbo, Banks exhaust/intake, pyrometer, tachometer;
1986 K5 6.2 Blazer, 2" lift, 33" tires, Banks intake, pyrometer, tachometer
1963 wife, one owner, average mileage for the age but in excellent shape, a keeper
1992 daughter, low mileage, pretty, limited edition, but requires some money to maintain
1995 son, sports model, very fast & peppy, time will tell on durability and maintenance costs
"Grease is good"