The Texas Speed Steel Adjustable LS3/L99/L92/LSA/LS9 1.8 Ratio Roller Rocker Package is a complete set of adjustable roller rockers for rectangular-port LS engines. The rockers are manufactured from 17-4 stainless steel with a swedged roller pin, fit the factory rocker pedestals and are Spintron tested in-house by Texas Speed.
The 1.8:1 ratio increases valve lift and effective duration over the stock 1.7 ratio for the same camshaft lobe, and the adjusters allow lash to be set, which makes the package a fit for solid roller camshaft builds that need accurate valvetrain geometry. Texas Speed requires its TSP tall valve covers with these rockers, and minor cylinder head trimming may be needed depending on casting variation. Valvetrain clearance and geometry should be verified before final assembly.
Specifications
- Rocker ratio: 1.8:1
- Type: Adjustable roller rocker arms, bolt to factory pedestals
- Material: 17-4 stainless steel
- Roller pin: Swedged for added durability
- Fitment: LS3, L99, L92, LSA and LS9 cylinder heads
- 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
Note: Requires TSP tall valve covers.
Note: Minor cylinder head trimming may be required depending on casting variation.
Note: Verify valvetrain clearance and geometry before final assembly.
FAQ
Which cylinder heads do the Texas Speed adjustable 1.8 LS3 rockers fit?
Texas Speed lists this adjustable 1.8 ratio roller rocker package for LS3, L99, L92, LSA and LS9 rectangular-port cylinder heads. The rockers bolt to the factory rocker pedestals.
How does a 1.8 ratio rocker change valve lift?
A 1.8 ratio multiplies camshaft lobe lift by 1.8 rather than the stock 1.7, so valve lift and effective duration rise for the same cam. Spring travel, retainer clearance and piston-to-valve clearance should be rechecked at the higher lift.
Do these rockers require tall valve covers?
Yes. Texas Speed requires its TSP tall valve covers with this adjustable rocker package because the adjusters sit higher than a factory rocker.
Are the 1.8 adjustable rockers for solid roller cams?
Texas Speed recommends them for solid roller camshaft applications that need accurate valvetrain geometry and lash adjustment. They are 17-4 stainless steel with a swedged roller pin and Spintron tested in-house.
Is any cylinder head modification needed?
Minor cylinder head trimming may be required depending on casting variation, and Texas Speed advises verifying valvetrain clearance and geometry before final assembly.
