ARP 2000 Series Head Stud Kit to suit Nissan RB20 / RB25 / RB30 Twin Cam / CA18 (AR202-4309) rd brace They are specifically designed for

They are specifically designed for your application and built around unique "merge collector" design

But some of you don't need to win world time attack

ve taken the proven technology from our WG38

they expand and contract in size and the our Constant Tension clamps outer ‘Spring Action Band’ works to maintain consistent force & load for maximum reliability

They also fit the popular Ford Ecoboost engines

ARP 2000 Series Head Stud Kit to suit Nissan RB20 / RB25 / RB30 Twin Cam / CA18 (AR202-4309) rd brace They are specifically designed forPart number: AR202 4309 ARP 2000 Series 11mm Head Stud Kit to suit Nissan RB20DET, RB25DET, RB30ET With Twin Cam Head & CA18DET. Alternate part numbers: AR2024309 202 4309 2024309 Q. Which ARP head studs should I use? 625 or 2000's? A. In our opinion and using logic, the performance of a bolt is strictly limited to its stretch. The stretch is what gives the benefit of tension of a cylinder head. Now the only thing that separates a ARP 2000 and a 625