SB CHEVY R SEAL FLYWH BLT

For Use With 90 Degree V6 Chevy/ 305-502 Chevy V8 with 1 Piece Rear Seal; 1.000 Inch Under Head Length; 7/16 Inch -20 Thread Size; 200000 PSI Tensile Strength; 5/8 12 Point Head Type; Black Oxide; Chrome Moly; Pack of 6