Stage 8 Locking Header Bolt Kit - 6pt. 8mm-1.25 x 25mm (16) PTT-CS-3-QD Both will fit Small Block

Both will fit Small Block Chevy engines without modifications and Big Block Mark IV Chevy engines with minor block modifications

Up to 735 CFM

Stainless steel hardware is included

1957-1958 Pontiac Super Chief

Mitsubishi 4G63 7-Bolt

Stage 8 Locking Header Bolt Kit - 6pt. 8mm-1.25 x 25mm (16) PTT-CS-3-QD Both will fit Small BlockProduct Description: Header Bolt Locking 8 mm x 1. 25 Thread 25 mm Long Hex Head Steel Nickel Plated Ford Modular 2005 15 Set of 16 Stage 8 Locking Fasteners has provided Fail Safe Joint Integrity For Critical Applications over 22 years. Stage 8 Locking Fasteners are available in kits, ready to install on all critical automotive parts like headers, starters or turbos. Stage 8 Locking Fasteners easily install on all popular makes and models and are