The Texas Speed Steel Adjustable Cathedral 1.7 Ratio Roller Rocker Package is a complete set of adjustable roller rocker arms for LS engines with cathedral-port cylinder heads. Texas Speed machines them from 17-4 stainless steel and uses a swedged roller pin for durability in demanding applications, and the rockers bolt to the factory rocker pedestals so no shaft system is needed.
The 1.7 ratio matches the factory LS rocker ratio while adding adjustability, which is why Texas Speed recommends this package for solid roller camshaft applications where lash must be set. Texas Speed Spintron tests these rockers in-house. Because the adjusters sit taller than a stock rocker, factory valve covers are not compatible and TSP tall valve covers are required. Minor cylinder head trimming may be needed depending on the casting.
Specifications
- Rocker ratio: 1.7:1
- Type: Adjustable roller rocker arms, bolt to factory pedestals
- Material: 17-4 stainless steel
- Roller pin: Swedged for added durability
- Fitment: GM LS 5.3L cathedral-port cylinder heads, LS1 and LS6
- Recommended use: Solid roller camshaft applications
- Testing: Spintron tested in-house by Texas Speed
- Quantity: Sold as a complete set
- Valve covers: TSP tall valve covers required; factory covers not compatible
Note: Factory valve covers are not compatible. TSP tall valve covers are required.
Note: Minor cylinder head trimming may be required depending on casting.
Note: Verify valve cover and cylinder head clearance before installation.
FAQ
Which cylinder heads do the Texas Speed 1.7 adjustable cathedral rockers fit?
Texas Speed lists this adjustable 1.7 ratio roller rocker package for GM LS cathedral-port cylinder heads, including LS1, LS6 and 5.3L cathedral-port heads. They bolt to the factory rocker pedestals.
Do I need different valve covers with these adjustable rockers?
Yes. The adjustable design is taller than a stock rocker, so factory valve covers are not compatible and Texas Speed requires its TSP tall valve covers with this package.
Are these rockers for hydraulic or solid roller camshafts?
Texas Speed recommends this adjustable rocker package for solid roller camshaft applications, where the adjuster allows valve lash to be set. The adjustability is what separates them from a fixed non-adjustable rocker.
What are the rockers made of?
The rocker bodies are 17-4 stainless steel with a swedged roller pin, and Texas Speed Spintron tests the rockers in-house to verify valvetrain stability.
What is the difference between the 1.7 and 1.8 ratio Texas Speed cathedral rockers?
The 1.7 ratio matches the stock LS rocker ratio so valve lift stays as the camshaft specifies. The 1.8 ratio version increases valve lift and effective duration by about six percent for the same cam lobe, which adds area under the lift curve but requires checking spring, retainer and piston-to-valve clearance.
Is any machining required to install these rockers?
Minor cylinder head trimming may be required depending on the casting. Texas Speed advises verifying valve cover and cylinder head clearance before installation.
