Are you building a supercharged or nitrous motor? We recommend these thicker wall hardened push rods from Manley. SRT-8 HEMI 6.1L Stock Length Pushrod Kit Includes: 8 Intakes Push Rods @ 6.650" Length 8 Exhaust Push Rods @ 7.850" Length Wall Thickness @ 0.120 Wall Thickness Manley pushrods have meticulously formed ends with exact radii. They have excellent concentricity and closely controlled length. For strength, they are heat treated and black oxide finished.