LS Series Trickflow LS1 Cathedral port

LS Series cylinder head

This 20047 rocker set is Designed for the Trickflow LS1 Cathedral port head. This set was designed to have a “Dropped Tail ” to help with pushrod clearance and valve cover clearance. This set will work with stock valve cover’s

Call Now To Order (775) 884-2292.

Part#: 20047

INTAKE
Length: 1.450
Ratio: 1.70
Offset: .130
EXHAUST
Length: 1.450
Ratio: 1.70
Offset: On Center

Features

Features & Benefits of T&D shaft-mount roller rocker systems T&D rocker arms have an oil passage (see diagram) built into most rocker arms to channel pressurized oil from the pushrod cup to the shaft bearings and then on to the roller tip. T&D's 7/16” adjuster screw and heat-treated alloy steel jam nut are the largest in the industry, giving more thread contact area to positively secure lash settings. Each adjuster is broached for a big 3/16" socket to eliminate twisted hex keys. T&D’s larger diameter shafts are made from 4130 steel, deep case hardened and tempered for maximum wear resistance and strength. T&D aluminum rocker bodies use 2024 aluminum made to our specifications for improved tensile and yield strength, and increased notch sensitivity, fatigue resistance, strength at elevated temperatures and chemical resistance. T&D has gone to great lengths to find the right material to use in its steel rocker bodies, which remains proprietary. Extensive R&D, and constant hands-on usage, has given T&D a distinct advantage in the area of steel rocker development. Presently, many of the steel rockers are within a few grams of the aluminum ones they replace. Every T&D rocker system is designed with racers and ease of installation and maintenance in mind. Most applications require no head modifications, no machining of any kind. If machining is required, full instructions are included. All hardware and shims necessary to attach a rocker system are included. On models with individual shafts, individual rockers can be removed quickly for valve spring service. Most T&D rocker systems are rebuildable. T&D tests every rocker arm against the competition for weight, mass moment of inertia, deflection, hardness and cycle durability. Through this testing, T&D rockers have been continuously improved to be the lightest, most efficient, and most durable rocker arms on the market. Through rigorous on-track testing, T&D rocker arms have survived the torture tests, in all forms of racing.

Foot Notes

1Most common system for this cylinder head.
2 Other standard offsets available for this cylinder head.
3All required mounting hardware supplied with assembly
10Bolt-on assembly, no machine work required
13May require minor clearancing
33Will work with factory valve cover
41On-center lifter acceptable for most applications
50For use with 5/16” pushrod
51For use with 3/8” pushrod
109Will clear most common spring diameters