SB Chevy Stainless Steel Intake Manifold Bolt kit Manufacturer: Pioneer Mfg part #: 854010 # Pioneer Performance Stainless steel kits feature heat-treated 180,000 psi decreases the chances of bolts over stretching after repeat teardowns. Stainless steel fasteners are rust and corrosion resistant # Special 12 point heads provide wrenching clearance in tight areas and offer better grip for torquing components. # 12 Bolts per kit ( 3/8" - 16 x 1”) 3/8" head