Wedge Locking Header Bolts PR66753 Product:1" UHL x 3/8-16" (Set Of 12) Pre-1971 blocks may require modifications

Pre-1971 blocks may require modifications

When the shifter handle is pulled into low gear

Note : Do NOT pressurise over 15 psi

BB Chev Forged H-Beam Conrod Set6

Wedge Locking Header Bolts PR66753 Product:1" UHL x 3/8-16" (Set Of 12) Pre-1971 blocks may require modificationsWedge Locking Header Bolts1" UHL x 3 8 16" (Set Of 12) PR66753 66753 Fits: GM V6, SB 265 400, Buick, Olds, Pontiac '79 & earlier Mopar BB 383 440 exc 413, AMC V8's w 3 8" bolts Each PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. When the bolt is torqued to 28+ ft lbs, the washers super hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the header. After being self locked