The Texas Speed 1.72 Ratio Steel Roller Rocker Arm Set is a bolt-on upgrade for LS1, LS2 and LS6 cathedral-port engines. The steel rocker bodies are stronger than the factory rockers, and a roller tip replaces the factory sliding tip to cut wear and friction at the valve stem. Texas Speed designed the set to add that strength without the extra valvetrain weight some aftermarket rockers carry, and it mounts on the factory rocker pedestals.
Each set ships with the trunnion upgrade already installed. The standard option uses the Texas Speed trunnion kit with upgraded bearings for long service life; the second option substitutes the CHE bushing kit, a bushing-style trunnion aimed at higher load applications. Texas Speed notes the rockers require a pushrod roughly .175" shorter than the current pushrods and recommends verifying the correct length on the engine at installation.
Specifications
- Application: LS1, LS2 and LS6 cathedral-port engines
- Rocker ratio: 1.72:1
- Rocker material: Steel
- Tip: Roller tip for reduced wear and friction at the valve
- Mounting: Bolt-on to factory rocker arm pedestals
- Trunnion: TSP trunnion upgrade kit installed, or CHE bushing kit installed (selected at ordering)
- Pushrod length: Approximately .175" shorter than current pushrods, verify at installation
- Part numbers: TSP-172RR-CATH (TSP trunnion), TSP-172RR-CATH-CHE (CHE bushings)
Ordering Options
Select the trunnion type when ordering: the TSP trunnion kit with upgraded bearings or the CHE bushing kit. Both versions arrive with the trunnions installed in the rockers. New pushrods approximately .175" shorter than the current set will be needed; Texas Speed sells 5/16" chromoly pushrods in .025" length steps and an adjustable pushrod length checker.
Note: These rocker arms change pushrod length. Texas Speed states the required pushrod is approximately .175" shorter than the pushrods currently in the engine and recommends verifying the proper length during installation.
FAQ
What engines do the Texas Speed 1.72 steel roller rockers fit?
They are a bolt-on set for LS1, LS2 and LS6 cathedral-port engines and mount on the factory rocker pedestals. Texas Speed sells a separate 1.72 set for LS3, L99, L92, LS9 and LSA rectangular-port heads.
Do these rockers come with the trunnion upgrade installed?
Yes. Every set ships with either the Texas Speed trunnion kit or the CHE bushing kit already installed, depending on the option selected at ordering.
What is the difference between the TSP trunnion kit and the CHE bushing kit?
The TSP trunnion kit uses upgraded bearings in place of the factory style trunnion for long life. The CHE bushing kit replaces the bearings with bushings, a design chosen for higher load and extreme duty valvetrains.
Will I need new pushrods with these rockers?
Yes. Texas Speed states these rockers require a pushrod approximately .175" shorter than the current pushrods, and the correct length should be verified with a pushrod checker during installation.
Why choose a roller tip rocker arm?
The roller tip rolls across the valve stem instead of sliding, which reduces friction and wear on the valve tip. Combined with the steel body, it gives a stronger rocker than stock without adding unnecessary valvetrain weight.
Is the rocker ratio the same as the factory LS1 rocker?
Yes. The Texas Speed set is a 1.72:1 ratio, matching the factory LS rocker ratio, so published camshaft lift figures for stock-ratio rockers still apply.
