Part Number: 6912. Header Bolt - Locking - 5/16-18 in Thread - 0.875 in Long - Hex Head - Steel - Nickel Plated - GM V6 - Set of 12. These nuts and bolts have a variety of uses such as installing headers.
Stage 8 Header Bolt Kit - 6pt. 3/8-16 x 1in (2) 8910A
Stage 8 Header Bolt Kit - 6pt. 3/8-16 x 3/4 (12) 8911
Stage 8 Header Bolt Kit - 12pt. 3/8-16 x 1-1/4 (12) 8911B
Stage 8 Header Bolt Kit - 12pt. 3/8-16 x 1-1/4 (16) 8913B
Stage 8 Header Bolt Kit - 6pt. 3/8-16 x 3/4 (16) 8913
Stage 8 Header Bolt Kit - 6pt. 3/8-16 x 1in (12) 8916A
