The JE Pistons Pro Seal head gasket for BMW M20 series (B25/B27) is specified with a 3.336-inch bore and 0.079-inch thickness. This head gasket is intended as a direct replacement for the listed M20 engines and lists bore and thickness to match engine sealing requirements; the description identifies the specific BMW M20 applications named in the product title.
JE Piston Pro Seal BMW M20 Series B25/B27 3.336in Bore .079in Thickness Head Gasket