Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
![High Performance Rocker Arm Trunnion Upgrade Kit for GM 4.8L to 6.2L [Polished]](https://www.jegs.com/images/mini_750/600/689/689-mrk-100hp.jpg)
Vehicle Info NeededMELLINGPART NUMBER: 689-MRK-100HP
High Performance Rocker Arm Trunnion Upgrade Kit for GM 4.8L to 6.2L [Polished]
$25999
2 left in stock
Ships on Sep 14, 2026
Lowest Price GuaranteeTrunnion upgrade kit that replaces factory rocker arm bearings with hardened steel.Fits Avanti, GM, GMC, Isuzu and Saab 4.8L to 6.2L engines Hardened trunnions with bronze bushings Retainer clips and nuts included Steel, polished finish
The needle bearings in factory LS rocker arms are the weak link once spring pressure and rpm climb, and when they let go the debris goes straight through the engine. This kit converts the arms to hardened trunnions on bronze bushings, which handle load better and improve oiling at the pivot.
Melling MRK-100HP Upgrade Contents
- Hardened steel trunnions with bronze bushings and retainer clips.
- Nuts included; mounting studs and bolts are not supplied.
- Steel body with a polished finish, non-adjustable design.
- Performance grade; install using trunnion install kit MTIK-100.
Part TypeRocker Arm Kit
BrandMELLING
Package Height5.75
Package Width6.25
Package Length14.75
Weight3.26 PG
Part CategoryPerformance Parts
Rocker Arm Body TypeNon-Roller
Nuts IncludedYes
Mounting Studs IncludedNo
Mounting Bolts IncludedNo
Body MaterialSteel
Body ColorGray
Part FitmentDirect Fit
Body FinishPolished
AdjustableNo
Grade TypePerformance
Vendor Part NumberMRK-100HP
Package Qty1
Package TypeEA
No Questions
No Reviews
Some parts are not legal for use in California or other states with similar laws / regulations
