27.2cc billet 4-bolt head kit conversion for RC engines. Features removeable dome for easy compression changes and a 4 bolt girdled head shell for strength. This kit includes a 34mm CY F270 cylinder that we CNC machine to work with our billet head shell. Also included are CY 4-bolt engine cases w/bearings and seals, 34mm F270 piston kit, 30mm(+2) stroker crankshaft, billet head shell, removable dome, .012" copper head gasket, base, intake, exhaust, and case gaskets, and necessary hardware. This can be used on the R230, R230, G230RC, & G260RC engines.