Push Rod Tubes, Big Mouth Spring Loaded, 8 Piece

Scat Big Mouth Spring-Loaded Push Rod Tubes (8 Piece Set)

Vehicle Fitment and Compatibility

These Scat Big Mouth push rod tubes are designed for VW Type 1, 2, and 3 aircooled engines. They are specifically engineered for high-performance applications, including stroker engines and builds utilizing high-lift camshafts or high-ratio rocker arms. Because they are spring-loaded and adjustable, they can be installed without removing the cylinder heads, making them an ideal upgrade or replacement for Beetle, Karmann Ghia, Bus, and Dune Buggy engines.

Product Overview

Manufactured from 6061-T6 aluminum sleeves and featuring high-temperature Viton O-rings, these tubes offer a 20% larger diameter than stock units. This increased clearance eliminates the common issue of pushrods rubbing against the tube walls in high-lift setups. The dual O-ring design provides a superior seal compared to standard adjustable tubes, ensuring your engine stays leak-free even under high-stress conditions.

Pro Tech Tips for Installation

1. Lubricate the Viton O-Rings: Before sliding the sections together or inserting them into the engine, apply a light coating of clean engine oil or assembly lube to the Viton O-rings. This prevents the seals from binding, twisting, or tearing during installation, ensuring a vacuum-tight seal.

2. Prep the Seating Surfaces: Use a lint-free rag and solvent to thoroughly clean the bores in the engine case and the cylinder heads. Any leftover debris, old RTV, or carbon buildup can prevent the tube ends from seating properly, which is the leading cause of leaks in adjustable push rod systems.

3. Check for Proper Tension: When installing, ensure the internal spring is providing firm outward pressure against both the case and the head. As aircooled engines heat up, the cylinders and heads expand; the spring-loaded design is specifically intended to "grow" with the engine to maintain constant sealing pressure.