I'm confused i'm running a b16a1 engine with a spec 96 type-r b18c head. I want to buy me some ARP studs to keep the head from lifting when pushing with the nitrous. Does anyone know which studs i need u have got the 208-4601 for the b16a and the 208-4303 for the b18c. ARP says: Kit # 208-4302 has 8-studs at 7.100 long & 2-studs at 8.000 long kit # 208-4601 has all 10 studs at 7.100 long I don't know if the length difference is in the head or block. You would need to check that on your end. Did some checking with the EPC but i'm not sure the B18C it shows is the type-r engine i think it's the US GSR version which should be different from the faster Type-R.