Chevrolet 396-502 (Mark IV) 1.70 7/16 Roller Tip Billet Aluminum Rocker Arms Unique full body design offers less flex and will withstand 900+ lbs. of spring pressure at over .900” lift. 100% CNC machined. Lightweight for maximum performance. Designed for more retainer and spring clearance than most other manufacturers. They feature needle bearing fulcrums and roller tips, centerless ground trunnions, centerless ground pins and rollers and include thick walled adjusting nuts. Micropolished surface finish for maximum durability. Purple anodized for additional protection. Available in most popular ratios. Unconditional Lifetime Warranty to the original purchaser (with proof of purchase) for life! Made in the USA.