Melling
Polylock
SKU: M00L MRM-100HP
Description
Part #: MRM-100HP
Made In USA. Melling GM LS rocker arm adjusting nuts are high performance polylocks designed for full roller rocker arms. Made from heat-treated, premium-grade 4140 Chromoly steel, these adjusters provide 190,000 psi tensile strength for the utmost in reliability. Precision CNC-machined threads to ensure optimum seat pressure, flush-machined set screws for proper contact on the studs, and, best of all, they don't require any special tools for installation.
Features:
- 3/8 - 24 With Set Screw
- Chromoly Steel
- Sold As A Set Of 16
High Performance LS Polylock
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Melling |
| Part Number | M00L MRM-100HP |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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