This is a factory style investment cast rocker arm for GM LS-Series engines. It uses a pedestal mount design, a 1.70 rocker ratio, and a full roller trunnion and tip. The part number crosses to the standard non-offset LS rocker shared across the LS family.
Specifications:
- Rocker Arm
- Pedestal Mount
- 1.70 Ratio
- Full Roller
- Steel
- Natural
- GM LS-Series
- Sold as: Each
- Part number: 12681275
Applications:
- GM LS-Series engines (standard non-offset rocker)
FAQ
What is the rocker ratio?
It is a 1.70 ratio rocker arm.
Is this a roller rocker?
Yes. It is a full roller design on both the trunnion and the valve tip.
How does it mount?
It uses a pedestal mount, bolting directly to the cylinder head boss.
Does it fit Small Block Chevy engines?
No. This part number is for GM LS-Series engines. It is not a traditional Small Block Chevy stud mount rocker.

