THESE ARE PROBABLY THE BEST QUALITY BOLT OUT IN THE MARKET . THEY ARE 12 POINT WITH A GREAT LOOK AND FITMENT . EVERYBODY KNOW OLDSMOBILE HAS THOSE HARD TO GET TO BOLTS WERE 6 POINT CANT BE USED AND ALLENS HAVE THE TENDENCY TO STRIP . THEY COME WITH 12 BOLTS AND 12 WASHERS . 8 LONG AND 4 SHORT . THEY WILL WORK WITH STOCK OR ALUMINUM INTAKES . HERES A COUPLE TO LIST .EDELBROCK 2151 . EDELBROCK 7111 , OFFENHAUSER TUNNEL RAM , AND W-30/W-31