Jeep 4.0 AMC 4.2 "Lightweight" Roller Rocker Arm Kits(1.60/1.70, Fixed & Adjustable)
If you want dyno proven hp & tq gains then here's one of the easiest ways to add 5hp/10ftlbs(1.60) or 10hp/15ftlbs(1.70). This is our next generation, available in Black and Tumble finish, with even lighter weight, yet heavy duty, available in both 1.60 and 1.70 ratios fixed and "adjustable" roller rocker arm kits. These are 100% made in the USA and feature a heavy duty fully rollerized fulcrum and lightweight roller tip.
*3/8" .080" wall pushrods can only be used only on our competition heads or Edelbrock heads, unless you clearance your head accordingly. Possibly on fixed roller rocker arm kits and especially on adjustable kits you will have to space the valve cover up at least 1/2' for clearance from the added height of the over-sized rocker arms. We offer one of the best solutions for this issue with our 5/8" Billet Valve Cover Spacer Kit which is also listed on our site.
**Tech tip**
The factory rocker arm ratio is 1.60. Keep in mind when ordering your desired rocker arm kit that lift will be increased by going to a 1.70 ratio. Make sure your total lift value is not greater than your valve spring can handle(Coil bind).