2 5/8" core thickness Radiators were used with the L-82 engines or with heavy duty cooling option
1976 2nd design through 1982 replacement radiator has a dual diameter straight upper inlet 1 1/4" opening up to 1 1/2" - 4 row 17 x 26 1/4 x 2 5/8"
When using this radiator to replace a smaller 2" core it will be necessary to replace the mounting cushions
1979 2nd design through 1982 used an 1 1/4" upper hose
1976L through 1979 1st design used an 1 1/2" upper hose