Crower 74718F Features:

Stainless steel shaft-mount rocker system for BIG BLOCK CHEVY with AFR 24-degree 325 cc, 345 cc, and 357 cc Version 1 aluminum cylinder heads Heavy-duty 5/8 in. shafts with rigid 1-piece intake stands create a rock-solid valvetrain foundation and reduce rocker flex under extreme RPM loads CNC-machined ball race alloy steel shafts are double heat-treated and micro-finish ground for precise alignment, strength, and long-term racing durability Fully rollerized needle bearing fulcrums, aircraft-quality 12-point nuts, and hi-temp alloy lash adjusters support accurate valve motion and control

Shaft Rockers Bb Chev Afr 5/8 In. Shafts, 1-Piece Features:

• BBC AFR 24° 325 cc/345 cc/357 cc V1 fitment, shaft-mount valvetrain conversion, 1-piece intake stands, 5/8 in. shafts for high-rpm stability
• Stainless steel rocker system, fully rollerized needle-bearing fulcrum, reduced friction, precise motion, improved durability under extreme racing loads
• CNC-machined ball race alloy steel shafts, double heat-treated, micro-finish ground, added rigidity, accurate valve timing, maximum lift transfer
• Hi-temp alloy lash adjusters, thread-rolled after double heat-treat, aircraft-quality 12-point nuts, secure adjustment retention at high rpm
• Supports smaller-diameter pushrods, optional needle-bearing roller tips, reduced valve guide and stem wear, lower heat, longer spring life