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Description
Pacemaker | 2" Tri-Y Big Block Chev Conversion Headers | Holden HQ HJ HX HZ WB | PH5340 L/RPacemaker 2" Tri Y Big Block Chev Conversion Headers Holden HQ WB PH5340 L R Engineered for the ultimate muscle car conversion, the Pacemaker PH5340 headers allow for the seamless installation of a Big Block Chevrolet V8 into the iconic Holden HQ, HJ, HX, HZ, and WB series. These high performance Tri Y headers are designed to handle the massive displacement and exhaust volume of 396 to 496 cubic inch engines. Featuring large 2" (51mm) primary pipes
Pacemaker 2" Tri-Y Big Block Chev Conversion Headers - Holden HQ-WB - PH5340 L/R
Engineered for the ultimate muscle car conversion, the Pacemaker PH5340 headers allow for the seamless installation of a Big Block Chevrolet V8 into the iconic Holden HQ, HJ, HX, HZ, and WB series. These high-performance Tri-Y headers are designed to handle the massive displacement and exhaust volume of 396 to 496 cubic inch engines. Featuring large 2" (51mm) primary pipes and a substantial 3" (76mm) outlet, they provide the necessary flow to maximize torque and horsepower from your big block. Proudly Australian-made, these headers offer the precision fitment and durable construction required for high-horsepower street and strip applications.
Features:
This product offers the following high-performance features:
- Big Block Specific Design: Purpose-built for Chevrolet 396, 402, 409, 427, 454, and 496 Big Block V8 conversions.
- High-Flow Tri-Y Configuration: Designed to optimize low-to-mid range torque while maintaining high-end power.
- Heavy-Duty Construction: Features massive 2" (51mm) primary pipes and 2¼" (57mm) secondaries for maximum durability.
- Large 3" Outlet: Ensures minimal backpressure for high-displacement engines.
- Accessory Compatibility: Engineered to maintain clearance for Power Steering and Air Conditioning systems.
Product Specifications for PH5340 L/R
| Feature | Value | Feature | Value |
|---|---|---|---|
| Part # | PH5340 | Gasket | DSF 23 |
| Primary Pipe | 2" (51mm) | Secondary Pipe | 2¼" (57mm) |
| P/Steering | Yes | Outlet | 3" (76mm) |
| Air Con | Yes | Fitting Time | 2 Hrs |
Important Notes:
- Mounting Requirements: These headers will only fit using HQ 350 Chev original engine mounting spacers or PACEMAKER spacers (Part Number: PEMP 350).
- Spacer Orientation: Spacers must be fitted on the correct side (RH spacer is 1¾” high, LH spacer is 1¼” high).
- Transmission Fitment: Compatible with both Manual and Automatic transmissions.
Important Information
- The image shown may not reflect the actual product
- Shipping times may vary depending on destination and stock availability
Vehicle Applications:
| Make | Model | From | To | Body | Series | Engine | Variant | Drivetrain |
|---|---|---|---|---|---|---|---|---|
| Holden | Kingswood / Premier / Monaro / Statesman | 1971 | 1984 | Sedan / Ute / Wagon / Coupe / 1-Tonner | HQ, HJ, HX, HZ, WB | Big Block Chev V8 (396-496) | Manual & Automatic | RWD |
Warranty Information
| Product | Warranty Period |
|---|---|
| Pacemaker Headers | Two (2) years. |
| Pacemaker King Brown 4x4 Exhaust systems | Five (5) years. |
| Pacemaker Sports exhaust systems | Five (5) years. |
| Fabrication products and accessories | One (1) year. |
Payment & Security:
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
Sturdy, Beautiful, and Functional
Color: Black
I love this MacBook stand. It sits at the perfect height (my neck doesn’t hurt anymore!), it matches the Space Black finish on the MacBook, and is very sturdy. I considered the 12 south instead of this, and returned it for this instead. Better value and better product. Overall, I highly recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 12, 2025
★★★★★ 5
Fantastic Stand
Color: Gray, Color: Gray
Cooling - I purchased this stand for use in college, primarily so I could raise my laptop to the same height as my primary monitor. While my focus in purchasing this was on raising my laptop, the stand also helps cool the laptop. I have been thoroughly surprised i its effectiveness. Many times my friends and I will be working on homework together running programs such as Microsoft Teams and Mathworks Matlab simultaneously. In doing so, I will have my laptop on the stand so I can use my monitor. While my friends identical college-issued laptops are very, very hot due to the intensive tasks they are completing, mine is, at the most, warm to the touch. The only difference is that I am using the stand, and they are not. The slots in the stand, while not overly large, do aid in cooling the laptop significantly.
Build Quality - Prior to purchasing this stand, I saw several reviewers mentioning the finish on the stand, claiming it had an almost gritty quality. After receiving the product, I believe those customers were hoping for a very high level of final finishing. That is not to say that it is not a high quality finish, but if you are expecting it feel like the aluminum lid of a Macbook, it will have a slightly coarser finish than that.
The stand has rubber pads on all points it would contact the laptop with. These pads are mounted very securely to the frame, and I am not concerned at all about them falling off. If I would have to guess, they are made of a type of silicone and have shown no signs of wear after 2 months of daily use. They are also present on the bottom of the stand to protect the surface it is set on.
The stand itself is constructed of 4mm thick aluminum all around. As such, it is very sturdy. I would be absolutely shocked if a laptop broke one of these stands. I have even used it to hold textbooks temporarily, and it has held them with supreme ease.
Color - I purchased the model in the darker gray color. I did not have anything I was trying to match it with. As such, I cannot say whether it will match Apple's Space Gray products, although it looks very reminiscent of it.
For reference, my laptop is an HP Elite Dragonfly with a 13.3 inch screen, and my monitor is a 21.5 inch Acer unit.
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Reviewed in the United States on April 10, 2021
★★★★★ 5
Great minimalist stand
Color: Gray, Color: Gray
Really like the minimalist design of this stand. Quality is top notch with steady material and refined edges.
Had to make minor modifications to prevent laptop touching metal edges when putting on with slight angel tilt.
Overall very satisfied with the product.
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Reviewed in the United States on September 13, 2025
★★★★★ 5
Simple upgrade that actually improves your setup
Color: Black
I didn’t expect much from a laptop stand, but this made a noticeable difference right away. It lifts the laptop to a much better eye level, which helps a lot with posture—especially if you’re working for a few hours at a time.
The build quality is solid. It’s aluminum, has a bit of weight to it, and doesn’t feel cheap. Once it’s on the desk, it stays in place. The rubber grips hold the laptop securely, and I haven’t had any slipping issues.
I’m using it with a MacBook Pro and it fits perfectly. There’s enough space underneath for airflow, and I’ve actually noticed the laptop runs a bit cooler compared to sitting flat on the desk.
Overall, it’s a simple product but very effective. One of those small upgrades that you end up appreciating every day.
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Reviewed in the United States on May 5, 2026
★★★★★ 5
I like it just fine. It’s good and it works for me.
Color: Black
It’s sturdy and I like the design. Seems pretty comparable to every other MacBook stand, but I chose this one for some reason and I’m happy with it. The height is not adjustable, so if you want that find another one.
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Reviewed in the United States on May 6, 2025
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