HPD Special Parts
Euro 4 4JJ1 / 4JJ3 Aluminium Rocker Cover - HPD
Euro 4 4JJ1 / 4JJ3 Aluminium Rocker Cover - HPD
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Euro 4 4JJ1 / 4JJ3 Aluminium Rocker Cover
HPD Special Parts • Thai Import • Limited Production
Current Stock, Upgraded Breather Spec
All covers currently in stock have 2 additional breather ports welded into the cover. Included with each cover: screw-in -10 AN fittings, a bung for the factory port, and a genuine HPD breather cover.
Note: cover mounting bolts are not included, see our Ti Burnt Blue bolt set to finish the look.
Product Overview
The HPD Special Parts cast aluminium rocker cover is the signature engine bay upgrade for Euro 4 4JJ1 and 4JJ3 platforms. Sourced directly from Thailand in small production runs, each cover is finished in a durable painted coating for a clean OEM+ presentation that sets a build apart the moment the bonnet lifts.
Pairs perfectly with other HPD hardware for a fully dressed engine bay, and with the upgraded breather spec on current stock, it's ready for a proper catch can setup straight out of the box.
What's Included (Current Stock)
- HPD cast aluminium rocker cover, painted finish, with 2 additional breather ports
- Screw-in -10 AN fittings for the additional ports
- Bung for the factory breather port
- Genuine HPD breather cover
Bolts are not included. Grab a Ti burnt blue rocker cover bolt set to complete the install.
Compatibility
Suits rocker covers with 4 bolts across the front edge:
- Isuzu D-MAX / MU-X, Euro 4 4JJ1
- Isuzu D-MAX / MU-X, 4JJ3 (2020 on)
- Mazda BT-50-4JJ3 (2020 on)
Not sure which cover you're running? Send us your VIN or rego and we'll confirm fitment before you order.
Key Features
- Cast aluminium construction, lightweight, rigid and built to last
- Premium painted finish, genuine Thai OEM+ styling
- Twin additional breather ports with screw-in -10 AN fittings (current stock)
- Factory port bung + HPD breather cover included
- Direct bolt-on replacement for the factory cover
Payment & Shipping
- Buy Now, Pay Later: Afterpay, Humm, Klarna & Zip available
- Free Express Shipping Australia-Wide
Limited Stock Notice
These covers are produced in very limited runs and are difficult to source in Thailand. Once a colour sells out, restock lead times typically run 1-3+ months.
Need one urgently? Message us before ordering to confirm availability and the latest ETA.
FAQs
Q: Do the covers come with breather fittings?
A: Yes, all current stock has 2 additional breather ports machined into the cover, with screw-in -10 AN fittings included, plus a bung for the factory port and an HPD breather cover.
Q: Are bolts included?
A: No, bolts are not included. We stock a matching Ti burnt blue 4JJ1/4JJ3 rocker cover bolt set to complete the install.
Q: How do I know if this fits my engine?
A: This suits Euro 4 4JJ1 and all 4JJ3 engines with 4 bolts across the front edge of the rocker cover. If unsure, send us your VIN or rego and we'll confirm.
Q: Will this fit a pre-Euro 4 4JJ1?
A: No, this cover is specifically for Euro 4 4JJ1 (4 front bolts) and all 4JJ3 engines. Earlier Euro 2/3 4JJ1 models use a 3-bolt front pattern and need the HPD 4JJ1 Aluminium Rocker Cover (Euro 2/3) instead.
Q: When will sold-out colours be restocked?
A: Aluminium covers are very hard to source in Thailand. Restock times vary but typically run 1-3 months. Contact us for the latest ETA on your colour.
Genuine Product Of
HPD Special Part Racing Shop
The Centrepiece of a Serious 4JJ Build
Cast aluminium • Twin -10 AN breather ports • HPD breather cover included • Limited Thai import stock
