The front bolt pattern decides it, not the year and not the badge on the ute. Walk out to the car, open the bonnet and count the bolts along the front edge of the rocker cover.

• 3 bolts across the front. Euro 2 and Euro 3 4JJ1. This listing is the right one.
• 4 bolts across the front. Euro 4 4JJ1 and 4JJ3. This cover will not fit. Order the Euro 4 4JJ1 and 4JJ3 Aluminium Rocker Cover instead.
• Not sure? Send us your VIN or rego and we will confirm which one you need before you spend a cent.

• Replaces the plastic cover with cast aluminium. High-grade casting, better heat resistance, and it will not go brittle and crack the way the factory plastic does.
• Suits tuned and hard-worked engines. More heat and more vibration is exactly where the plastic covers give up, and where towing and tuned builds live.
• Cleans up the bay. It is a good-looking part. That is a fair reason to buy one, and we are not going to pretend it makes power, because it does not.

• Isuzu D-MAX. 4JJ1 Euro 2 and Euro 3, 3-bolt front pattern, roughly 2007 to 2012.
• Holden Rodeo. 4JJ1, roughly 2007 to 2008.
• Holden Colorado. 4JJ1, roughly 2007 to 2010.

The plastic injector cover generally will not go back on. These HPD covers are shaved and low profile, which is the point of them. Most builds run without the plastic injector cover from here on. If keeping the factory injector cover matters to you, this is not your part.

• One HPD 4JJ1 aluminium rocker cover. Nothing else is in the box.

Sold separately, and worth ordering at the same time:

• 4JJ1 and 4JJ3 Billet Oil Cap. The factory cap looks wrong on an alloy cover.
• -10AN Crankcase Vent Adapter for tidy breather and catch can plumbing.
• 4JJ1 Injector and Rocker Cover Fitting Kit. Fresh gasket and injector sealing hardware.
• 4JJ1 HPD Bolt and Washer Set.

• Use a fresh rocker cover gasket and a new injector sealing kit. The 4JJ1 fitting kit has both. Reusing old seals is how a tidy job turns into an oil leak.
• Plan for the injector cover to stay off. Shaved and low profile means no room for it.
• Breathers and catch cans are fine. The cover works with HPD breather adapters and -10AN hardware, so routing stays neat.
• Do not lean on the bolts. Nip them up evenly by feel. It is aluminium, not a wheel nut.

• Free express shipping Australia-wide. Trackable, out of our Australian warehouse.
• Dispatch: in-stock orders placed before 2 PM AEST on a business day go out the same day, otherwise the next business day.
• Out of stock: these come from Thailand, so occasionally there is a 2 to 4 week wait. Ask us first if you are working to a date.
• Buy now, pay later: Afterpay, Humm, Klarna and Zip.

Q: Will this fit my 4JJ1?

A: It fits Euro 2 and Euro 3 4JJ1 engines with the 3-bolt front pattern, roughly 2007 to 2012, in the D-MAX, Rodeo and early Colorado. Euro 4 4JJ1 and 4JJ3 use a 4-bolt front pattern and need the Euro 4 cover linked above. Send us your VIN or rego if you are unsure.

Q: What happens if I order the wrong one?

A: It will not bolt on, and you will have wasted a week. Count the bolts across the front of the cover first. Three bolts is this listing, four bolts is the Euro 4 and 4JJ3 cover.

Q: Can I reuse my plastic injector cover?

A: Usually no. These covers are shaved and low profile, so most builds run without it.

Q: Do I need anything else to fit it?

A: A fresh rocker cover gasket and a new injector sealing kit. Both are in the 4JJ1 fitting kit linked above.

Q: Does it work with a catch can?

A: Yes. It pairs with the HPD breather adapters and -10AN hardware for clean routing.

Q: Will it make more power?

A: No. It is a cover. It keeps the oil in and it looks good doing it.