Toyota ARP Head studs 1UZ 1UZFE V8 ARP cylinder head bolts for your tuned 1UZ and 1UZ FE engine. With this kit it will be possible to mount ARP head studs for a reliable high horsepower 1UZ engine. Mounting : It is tight between the cam drive and the cylinder head bolts. Therefore, the 4 middle bolts must be countersunk 10mm for proper clearance. You can also grind down the studs. A combination of both countersink and grinding is recommended for proper clearance. Included parts : 20 ARP studs 20 ARP nuts 20 ARP trays 2 ARP mounting grease The cylinder head bolts are tightened at 60ft / lbs (approx. 81Nm) ARP stud information: Length: 127mm (5") Block thread: M10 x 1,5mm Socket Size:  12mm 12pt, 4mm Allen