The PRC Viton Valve Seals sold by Texas Speed, part number PRC-VS804V-16, are the replacement valve stem seals used in the Precision Race Components .660", .700" and .750" dual valve spring kits. They are sized for the larger or ribbed valve guides found on aftermarket LS cylinder heads rather than the factory guide diameter, so they seat correctly when a PRC dual spring kit is installed on ported or aftermarket heads.
The seals are made from Viton for heat and oil resistance and are sold as a set of 16, enough for one LS V8. They suit a rebuild or a spring change on heads that already use a PRC dual spring kit, or a fresh installation where the guides were replaced with larger or ribbed aftermarket guides. Confirm the valve guide outside diameter before ordering, since these seals are not intended for stock-size guides.
Specifications
- Part: Valve stem seals, PRC 150-VS804V
- Material: Viton
- Quantity: Set of 16
- Application: Replacement seals for PRC .660", .700" and .750" dual spring kits
- Guide type: Larger or ribbed aftermarket valve guides
- Component: PRC Viton valve seal (TSP-VS804V), qty 16
Kit Includes
- PRC Viton valve seal for larger or ribbed aftermarket guides with .660" and .700" lift spring kits, qty 16 (TSP-VS804V)
FAQ
What spring kits do the PRC VS804V Viton valve seals fit?
Texas Speed lists them as the replacement seals for the Precision Race Components .660", .700" and .750" dual valve spring kits used on LS cylinder heads with larger or ribbed aftermarket valve guides.
How many seals come in the PRC-VS804V-16 set?
The set includes 16 Viton valve stem seals, which covers all sixteen valves on an LS V8 engine. Texas Speed sells the seals only as a set of 16.
Will these seals fit factory LS valve guides?
They are intended for larger or ribbed aftermarket valve guides, not the stock guide size. Check the guide outside diameter on the cylinder heads before ordering, and use the standard PRC seal for factory-size guides.
Why are the valve seals made from Viton?
Viton is a fluoroelastomer that holds up to the heat and oil exposure at the valve guide, which is why PRC uses it for the seals in its high-lift dual spring kits.
Is this a vehicle-specific part?
No. The seals are matched to the valve guide type and the PRC dual spring kit on the cylinder heads rather than to a vehicle, so they are listed as a universal LS cylinder head component.
