It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all out competition engines. Simply stated, there's not a better stud setup on the market today.

ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Each stud is placed vertically in special racks and precisely heat treated to 200,000 psi. This procedure ensures complete and uniform heat penetration, giving far superior results to the more usual practice of placing them all in a basket and hoping for the best.

Following the heat treatment, each stud is centreless ground to make it as close to concentric as possible. This procedure involves about ten very slight cuts, and results in an exceptionally straight part to start from. They are then Thread Rolled which, due to being done AFTER the heat treatment, gives them around 2000% (20 times) better fatigue strength than studs that are threaded prior to heat treatment. It costs a lot more to do this way, because it is very tough on tooling, but the results are well worth the extra effort.

These ARP head studs have been specifically developed for the Vauxhall Z20 engines.

Full set including a sachet of ARP's assembly lube, for correct torquing.

Flywheel bolts play an important role in the performance and safety of race cars and street machines alike. That's why the fastener experts at ARP have developed special bolts that are far superiour to OEM hardware.

These premium grade Pro Series bolts are made from a material originally developed for NASCAR use, and have a tensile strength rating of 200,000 psi. They are forged from aerospace alloy and heat treated prior to thread rolling and machining. They feature an exclusive, low profile, 12-point head design and a slightly larger than OEM shank diameter for increased flywheel register.

This is for all 6-bolts, to your door.

Full set of Big End Bearings for the Z20 engine.

Manufactured by MAHLE, and available in standard size, or to suit a crank ground .25mm undersize.

Contact us about them, as we order them in.

.25mm under size bearings will be supplied unless you tell us otherwise.

3 Bar Bosch MAP/Boost sensor with built in temperature probe

Features a built in fast acting temperature probe, sensor is designed specifically for turbo applications.

We can source the plug and pins for this if you wished to utilise one in a standalone ECU application, and we can also supply 4 bar versions (3 bar boost).

K04 Turbo oil banjo bolt with built in restrictor

Proven to aid turbo life in hard use applications, also known to cure the odd smoking turbo too.

15 mins installation time with very simple tools, includes new copper washers.

Please note this will not be a fix for a completely broken smoking turbo!

Fitting video

Set of stainless bolts and washers to replace those terrible rusty Vauxhall ones.

ARP recommends the use of main studs over bolts whenever possible for several key reasons; First is the ability to obtain more accurate torque settings because the studs aren't being twisted into the blocks already-used-at-least-once threads. This also means that there is less force exerted on the blocks threads, which contributes to improved block life. The studs, being a slightly larger diameter than the fairly slack OEM bolts, ensure a more accurate alignment of the main caps.

All kits come with hardened and parallel ground washers and high quality nuts. They are manufactured from a special 8740 chrome moly steel, heat treated in house to 200,000 psi tensile strength, and then thread rolled precisely to the high tensile J-form spec to create a fastener 2000% stronger than others.

These ARP main studs have been specifically developed for the Vauxhall Z20 engines

Full set including a sachet of ARP's assembly lube, for correct torquing.

ARP Rod bolts, to fit the standard Z20 rods.

Ideal for a bit of piece of mind when over revving, or when running up toward 340hp with standard rods.

The ARP's are also a slightly larger diameter, for a better fit in the non-dowelled standard rods, ensuring better big end cap alignment for a rounder bore.

Full set, and come with ARP's thread lubricant to ensure proper stretch for a given torque.

Performance Cam Belt Kit

This uprated cambelt kit is built upon the Z20LEH kit, that includes one uprated steel idle roller on the exhaust side. It fits all the variants of Z20, the LET, LEH, LEL and LER.

We have replaced the intake side plastic roller with another uprated steel one. We find that the plastic rollers tend to make the belt degrade very quickly, along with themselves, which can be seen by pick up on both the roller and the belt after not too much running time.

With these steel rollers you do not get this pick up, and the rollers themselves will stand up to a lot more high rev abuse than their plastic counterparts.

We fit this kit to every engine we build now, as the more we looked at the rapid belt degredation, the more it worried us!

All parts are genuine GM, but we include a better bolt and lock washer for the tensioner, which doesn't have the silly shallow drive like the original.