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Description
Pacemaker | Tuned Competition Headers | Holden HQ-WB 253-308 V8 | PH 5225 L/RPacemaker Tuned Competition Headers Holden HQ HJ HX HZ WB 253 308 V8 PH 5225 L R Maximize the power output of your classic Holden V8 with these Pacemaker Tuned Competition headers. Designed for the HQ through WB series fitted with 253 and 308 V8 engines, these headers feature a "Tuned" length design. This configuration is engineered to provide superior exhaust gas scavenging, resulting in significant horsepower and torque gains across the mid to high
Pacemaker Tuned Competition Headers - Holden HQ-HJ-HX-HZ-WB 253-308 V8 - PH 5225 L/R
Maximize the power output of your classic Holden V8 with these Pacemaker Tuned Competition headers. Designed for the HQ through WB series fitted with 253 and 308 V8 engines, these headers feature a "Tuned" length design. This configuration is engineered to provide superior exhaust gas scavenging, resulting in significant horsepower and torque gains across the mid-to-high RPM range—perfect for street machining and competitive use.
Features:
This product offers the following high-performance features:
- Tuned Design: Specifically calculated primary pipe lengths to optimize engine breathing and peak performance.
- High-Flow Primaries: Large 1¾" (44mm) primary pipes leading into a 3" (76mm) outlet for maximum exhaust flow.
- Mandrel Bent: Precision mandrel-bent tubing ensures consistent diameter throughout the bend for unrestricted flow.
- Transmission Versatility: Compatible with various performance gearboxes including Turbo 400 and Ford Toploader (with Hatfield bell housing).
Product Specifications for PH 5225
| Feature | Value | Feature | Value |
|---|---|---|---|
| Part # | PH 5225 | Gasket | DSF 9A |
| P/Steering | Yes | Primary Pipe | 1¾" (44mm) |
| Air Con | No | Secondary Pipe | - |
| Oxy Sen | N/A | Outlet | 3" (76mm) |
| E.G.R | N/A | Fitting Time | 2½ Hrs |
| Design | Tuned | Y Branch | N/A |
Important Notes:
- Transmission Fitment: Will fit Turbo 400 and Ford Toploader gearbox (with Hatfield bell housing).
- Clutch Compatibility: Will fit with HZ type cable clutch and Hydraulic Clutch conversions. Will NOT fit HQ type mechanical clutch.
- Exclusions: Will NOT fit column change automatic or manual vehicles. Will NOT fit Powerglide Auto.
- Air Conditioning: This part is not compatible with Air Conditioning systems.
Important Information
- The image shown may not reflect the actual product
- Shipping times may vary depending on destination and stock availability
Vehicle Applications:
Vehicle Applications for PH 5225 L/R
| Make | Model | From | To | Body | Series | Engine | Variant | Drivetrain |
|---|---|---|---|---|---|---|---|---|
| HOLDEN | ||||||||
| Holden | Kingswood / Monaro / Belmont | 1971 | 1980 | Sedan / Coupe / Wagon / Ute | HQ, HJ, HX, HZ | 253, 308 V8 | Floor Shift Man & Auto | RWD |
| Holden | Statesman / One Tonner | 1980 | 1985 | LWB Sedan / Cab-Chassis | WB | 253, 308 V8 | Floor Shift Man & Auto | 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:
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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]
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4.6 ★★★★★
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Product Reviews
★★★★★ 5
Essential Prep for Top Scorers
Format: Paperback
As someone who was initially apprehensive about the transition from the traditional SAT to the new Digital SAT (DSAT), this test prep book has been a game changer.
What sets this book apart is its targeted approach. It's designed for students already scoring 600 or higher, focusing on the challenging questions of Module 2. This precision in practice ensures that you're not just reviewing what you already know - you're pushing the boundaries of your testing ability.
Each question is expertly crafted to mirror the format and difficulty of the actual DSAT questions, which has helped me gain confidence in handling the trickier problems, especially in the adaptive sections. The explanations are thorough and insightful, providing deeper understanding and techniques that are crucial for the exam.
Thanks to this book, I feel significantly more prepared than I ever have before. For anyone serious about aiming for the 99th percentile - this test prep book is for you!
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Reviewed in the United States on May 8, 2024
★★★★★ 5
Perfect for Serious Students!
Format: Paperback
As it states in the product details, the DSAT Prep book is great for students who already score 600 and higher.
As a teacher and tutor of the SATs (among other standardized exams), I needed more practice sets outside of the Barron's, The Princeton Review, and The College Board publications, which tend to be more mindful of beginner learners. I wasn't confident that the modules and questions from these texts were sufficiently challenging strong students. The DSAT from Edenbrook Learning removed that doubt.
I also appreciate the simplicity of the layout of the text: literally 4 tests with respective answer keys, raw score conversion, and explanations. There's no fluff — perfect for my needs.
Will recommend to colleagues and students alike!
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Reviewed in the United States on May 4, 2024
★★★★★ 5
The Best!!!!!
Format: Paperback
These practice tests are excellent. I feels so lucky to have found this prep book for my daughter right before the big test in May. The explanations for the main idea questions, fill-in-the-blank parts, and rewriting sentences were super useful and helped my daughter get a score over 700. Can't wait for the next book to come out!!
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Reviewed in the United States on May 18, 2024
★★★★★ 5
Very good practice book - very close to digital SAT
Format: Paperback
Good test book - recommended for practice
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Reviewed in the United States on November 28, 2024
★★★★★ 5
👍👍👍
Format: Paperback
Great book
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Reviewed in the United States on October 18, 2025