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Yella Terra YT6627A High Performance Roller Rockers for 83-04 Jeep CJ-5, CJ-7, CJ-8 Scrambler, Wrangler YJ, TJ & Grand Cherokee ZJ, WJ with 258c.i. & 4.0L 6 Cylin

Quadratec Part #: 51103.500
Yella Terra Part #: YT6627A
Yella-Terra High Performance Roller Rockers provide the best resistance to bending and breakage under high spring pressures at high RPM. Pressed steel rocker arms are simply prone to failure with a high rate of fulcrum wear, flexing, cracking, splitting and breakage resulting in power loss and possible piston failure.

Yella-Terra Rockers will greatly enhance valve train durability especially in performance applications.Traditional pressed steel rockers literally drag across the valve tips as the rockers open and close, causing high side loading on the valve. This inside force leads to irregular and rapid wear to valves, valve guides and valve seats . Roller tips on our Yella-Terra rockers eliminate side loading, resulting in quicker engine revs and a crisper exhaust note. Rocker fulcrums utilize roller bearings to greatly reduces friction in the valve train to provide a measurable power increase over standard rocker systems. Reduced friction lowers engine operating temperatures and a cooler-running engine. Aircraft-quality anodized aluminum extrusion arms are the strongest available. Ingeniously designed kits include quality hardware with easy instructions and can be fitted in around 1 hour with no head removal, machining or valve cover spacers required. Made in Australia.

Installation Notes
Installation Difficulty:
Level 3Advanced
Installation Time: 2-4 hours
Parts Included

12 Rocker Arms
Spacer Washers
Installation Hardware

  • Engine Size: 4.0L I-6, 4.2L 258ci I-6
  • Engine Fuel: Gasoline
  • Shipping Weight: 6lb
  • Shipping Dimensions: 18in x 10in x 3in (L x W x H)
  • Jeep Wrangler (TJ)

  • 2004 Jeep Wrangler (TJ)
  • 2003 Jeep Wrangler (TJ)
  • 2002 Jeep Wrangler (TJ)
  • 2001 Jeep Wrangler (TJ)
  • 2000 Jeep Wrangler (TJ)
  • 1999 Jeep Wrangler (TJ)
  • 1998 Jeep Wrangler (TJ)
  • 1997 Jeep Wrangler (TJ)
  • Jeep Wrangler (YJ)

  • 1995 Jeep Wrangler (YJ)
  • 1994 Jeep Wrangler (YJ)
  • 1993 Jeep Wrangler (YJ)
  • 1992 Jeep Wrangler (YJ)
  • 1991 Jeep Wrangler (YJ)
  • 1990 Jeep Wrangler (YJ)
  • 1989 Jeep Wrangler (YJ)
  • 1988 Jeep Wrangler (YJ)
  • 1987 Jeep Wrangler (YJ)
  • Jeep CJ-7

  • 1986 Jeep CJ-7
  • 1985 Jeep CJ-7
  • 1984 Jeep CJ-7
  • 1983 Jeep CJ-7
  • Jeep CJ-8

  • 1985 Jeep CJ-8
  • 1984 Jeep CJ-8
  • 1983 Jeep CJ-8
  • Jeep CJ-5

  • 1983 Jeep CJ-5
  • Jeep Grand Cherokee (ZJ)

  • 1998 Jeep Grand Cherokee (ZJ)
  • 1997 Jeep Grand Cherokee (ZJ)
  • 1996 Jeep Grand Cherokee (ZJ)
  • 1995 Jeep Grand Cherokee (ZJ)
  • 1994 Jeep Grand Cherokee (ZJ)
  • 1993 Jeep Grand Cherokee (ZJ)
  • Jeep Grand Cherokee (WJ)

  • 2004 Jeep Grand Cherokee (WJ)
  • 2003 Jeep Grand Cherokee (WJ)
  • 2002 Jeep Grand Cherokee (WJ)
  • 2001 Jeep Grand Cherokee (WJ)
  • 2000 Jeep Grand Cherokee (WJ)
  • 1999 Jeep Grand Cherokee (WJ)
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