Crower 74710B Features:

Crower 74710B steel billet shaft-mount rocker system for BIG BLOCK CHEVY with Dart Race Series 18° oval port cylinder heads 1.850 in. arm length with .100 in. intake offset, .150 in. exhaust offset, and 5/8 in. 1-piece intake stands CNC-machined from ball-race alloy steel, double heat-treated, and micro-finish ground for strength at operating temperatures Fully rollerized precision needle-bearing fulcrum, super-secured axles, aircraft-quality 12-point nuts, and high-temp alloy lash adjusters

Shaft Rockers Bb Chevy Da Dart 18° Oval Port, Features:

• CNC-machined billet steel rockers for BBC Dart Race Series 18° oval port heads with 1.850 in. arm length and race-ready geometry control
• Fully rollerized needle-bearing fulcrum with super-secured axles for reduced friction, stable operation, and more accurate valve timing at high rpm
• 5/8 in. 1-piece intake stands with .100 in. intake offset, .150 in. exhaust offset, and matched 196F/197F stand IDs for precise fitment
• Double heat-treated ball-race alloy steel construction with in-house micro-finish grinding for maximum strength at operating temperature and long wear life
• Needle-bearing roller tip design reduces valve stem scrubbing and side loading, lowers heat, improves spring life, and supports increased rpm capability