When you are pushing the limits of air-cooled performance with a large 94mm bore, achieving the perfect deck height is the difference between a high-revving masterpiece and a catastrophic engine failure. These EMPI copper cylinder head gaskets are engineered to provide the ultimate sealing solution for high-performance Type 1, 2, and 3 Volkswagen engines. Unlike standard steel shims or running no gasket at all, copper offers a unique combination of malleability and thermal conductivity. This allows the gasket to "crush" slightly under torque, conforming to any minor imperfections in the cylinder or head mating surfaces to create an airtight seal that stands up to the extreme cylinder pressures found in high-compression or turbocharged builds. By utilizing a .040-inch thickness, these shims give engine builders the precision needed to fine-tune the combustion chamber volume, ensuring your compression ratio is exactly where it needs to be for maximum power and reliability.
Beyond just sealing, these copper gaskets act as a vital thermal bridge between your cylinders and your heads. In an air-cooled environment, heat is the enemy, and copper is one of the best conductors available. These shims help pull heat away from the top of the cylinder barrel and transfer it into the cylinder head where the cooling fins can do their job more effectively. This set of four is a mandatory addition for any 1915cc, 2276cc, or 2332cc engine project where tolerances are tight and performance is non-negotiable. Whether you are building a weekend cruiser, a dedicated drag racer, or a rugged off-road rail, Appletree Auto provides the professional-grade components you need to ensure your VW engine stays sealed tight under the most demanding conditions. Don''t settle for inferior sealing methods when you can utilize the proven reliability of copper to protect your investment.
1. The Importance of Annealing for Reusability
One of the greatest advantages of copper gaskets is that they can often be reused, but you must never simply pull them off one engine and throw them onto another without proper preparation. Copper work-hardens over time due to the heat cycles and the pressure of being torqued down. Before reusing these shims, you should perform a process called annealing. Use a propane torch to heat the copper gaskets until they reach a dull "cherry red" color, then immediately quench them in a bucket of clean water. This process softens the molecular structure of the copper, restoring its "dead soft" state and allowing it to crush and seal perfectly once again. If you skip this step, the hardened copper may not conform to the surfaces, leading to frustrating head leaks and loss of compression.
2. Measuring Your Deck Height Accurately
Before installing these .040-inch shims, you must verify your current deck height using a depth micrometer or a bridge tool. Install your cylinders and pistons without the gaskets first, and rotate the engine to Top Dead Center (TDC). Measure the distance from the top of the piston to the top of the cylinder rim. For a street-driven air-cooled VW, a total deck height of .040 to .060 inches is generally considered the "sweet spot" for optimal quench and safety. If your "naked" deck height is zero or even slightly negative, adding these .040 shims will bring you right into that safe zone. Always measure all four cylinders, as variations in connecting rod length or case machining can result in different deck heights across the engine.
3. Use Sealing Compounds Sparingly
While some builders prefer to install copper head gaskets dry, many master engine builders at Appletree Auto recommend a very thin coat of a dedicated sealant like Gasgacinch or a high-tack copper spray. If you choose to use a sealant, ensure it is applied evenly and is extremely thinyou should still be able to see the copper through the coating. The goal of the sealant is not to "fill gaps" but to provide a secondary tackiness that helps the gasket stay perfectly centered during the head installation and provides an extra layer of insurance against micro-leaks. Avoid using thick RTV silicone or heavy greases, as these can migrate into the combustion chamber or create uneven pressure points that prevent the copper from seating flat against the cylinder head.