90.5mm + 92mm Barrel Spacer Kit (0.030" Thick) - Type 1 Engines

Cylinder base shim set for aircooled VW Type 1 engines fitted with 90.5mm or 92mm cylinders and pistons.

These precision shims fit between the cylinder barrel and crankcase to alter deck height and adjust engine compression ratio during engine assembly. By increasing the cylinder spacing from the crankcase, combustion chamber volume is increased, allowing more accurate compression setup and piston-to-head clearance.

Cylinder base shims are commonly used during performance engine builds, especially on 1776cc, 1835cc and stroker Type 1 engines where precise deck height measurements are critical. They are also useful for compensating for flycut cylinder heads, crankshaft changes and other machining work.

Designed for use with 90.5mm and 92mm barrels commonly fitted to larger capacity Type 1 engines.

Manufactured to 0.030″ thickness (0.762mm), making them suitable for larger deck height corrections and moderate compression ratio adjustments.

Sold as a set of 4, enough for one complete engine.

We recommend measuring deck height accurately and calculating final compression ratio before final assembly. Ensure cylinder seating surfaces are clean and flat during installation.

Specifications:

• Fits 90.5mm and 92mm cylinders/barrels
• Thickness: 0.030″ (0.762mm)
• Fits Type 1 aircooled engines
• Quantity: Set of 4
• Fits between cylinder and crankcase

Applications:

Aircooled VW

• VW Beetle, 1960–1979, performance Type 1 engine applications
• VW Splitscreen Bus, 1960–1967, upright Type 1 engine applications
• VW Baywindow Bus, 1968–1979, Type 1 engine applications
• VW Karmann Ghia, 1960–1974
• VW Type 3, 1961–1973, upright Type 1 engine applications
• VW Type 181 Trekker, 1968–1983
• VW Buggy and Baja models using 90.5mm or 92mm Type 1 engines