VW CYLINDER SHIMS

Barrel shims are placed between the cylinder base and the engine case to adjust the "deck height"—the distance from the top of the piston to the top of the cylinder. This is critical for preventing piston-to-head contact and for dialing in the exact compression ratio required for your fuel type and camshaft profile. Our shims are available in various thicknesses and diameters to match every standard air-cooled bore size.

Our Barrel Shim Selection Features:

• Comprehensive Sizing: Available for standard 85.5mm cylinders up to big-bore 90.5mm, 92mm, and 94mm applications.

• Precision Thicknesses: Offered in increments such as .010", .020", .040", and .060" to allow for exact deck height calibration.

• Durable Materials: Manufactured from high-quality aluminum or steel to withstand the constant pressure and thermal expansion of the cylinder stack.

• Essential for Stroker Engines: A must-have component when using long-stroke crankshafts or when the engine case has been machined (decked).

• Matched Sets: Sold in sets of four to ensure consistent height across all cylinders.

Don't guess on your engine tolerances. Build with the precision that your project deserves. Shop the barrel shim collection at Appletree Auto today and take advantage of Free Shipping on all orders over $75!