ARP Head Stud Kit, BMW S14 NA Factory Valve Size is 31

Factory Valve Size is 31

which is necessary for achieving maximum power output

ideal for high-boost setups

Pro-Xtreme Piston Sets Include:

ARP Head Stud Kit, BMW S14 NA Factory Valve Size is 31This ARP head stud Kit is designed for the BMW S14 B20, S14B23, S14B25, S14B27 engines found in the E30 M3. Installing ARP head studs can provide several benefits, including increased clamping force, improved head gasket sealing, and greater overall engine strength. This is especially important in high performance and racing applications where the engine is subjected to increased stress and higher temperatures. Before installing ARP head studs, it is