This is a new set of Elgin Industries big block Chevy head bolts. These are Grade 8 bolts with 6 point hex heads. Will work on OE cast iron and aluminum heads and early Chevy heads. Cold forged and heat treated steel 190,000PSI, does not include the washers. Sold as a set (enough to do one engine). 366 CID (6.0L) 1966-1998 396 CID (6.6L) 1966-1972 402 CID (6.6L) 1970-1972 427 CID (7.0L) 1966-1998 454 CID (7.4L) 1970-1998