AFR's positive-stop valve stem seals are sized for 8mm valve stems with a 0.530-inch guide, made from Viton for AFR LS1 cylinder heads. They're sold as a set of 16, enough for a full LS engine.
Specifications:
- Type: Positive Stop
- Valve Stem: 8 mm
- Guide: 0.530 in
- Material: Viton
- Compatible Heads: AFR LS1 Cylinder Heads
- Quantity: Set of 16
- Part Number: 6612-16
Applications:
- GM LS-Series
FAQ
Which cylinder heads are these seals designed for?
AFR LS1 cylinder heads on the GM LS-Series platform.
What type of seal is this?
A positive-stop valve stem seal.
What valve stem and guide size do they fit?
8 mm valve stems with a 0.530 in guide.
What material are they made from?
Viton.
How many seals come in this listing?
It's sold as a set of 16, enough for a full LS engine.

