FORD H707P Big Block Connecting Rods Pistons 370 D9TE-AA .040

( Manufacturer Part Number: H707P ), ( Type: Connecting Rod Set ), ( Oe/oem Part Number: D9te-aa Aq51 ), ( Items Included: 8 Rods, 8 Pistons )

Review FORD 370 Big Block Connecting Rods And Pistons .040 fits AQ51

The **Ford H707P 370 Big Block Connecting Rods and Pistons (D9TE-AA, AQ51, 040)** assembly represents a premium, high-performance upgrade designed specifically for Ford s legendary **370 cubic inch (6.1L) Cleveland V8 engine**, a powerplant renowned for its durability, torque, and raw driving enthusiasm. These components are meticulously crafted to deliver exceptional strength, reliability, and performance, making them an ideal choice for both restoration projects and high-mileage engines seeking a fresh lease on life. The **H707P designation** indicates a fully matched set, combining **forged steel connecting rods** with **high-quality pistons**, ensuring optimal balance, reduced vibration, and enhanced longevity under heavy loads. The **D9TE-AA** and **AQ51** part numbers correspond to specific piston styles, with the **040** designation likely referring to a particular compression height or ring package, catering to applications requiring precise clearance for aftermarket camshafts, cylinder heads, or intake manifolds.

The **connecting rods** in this set are forged from high-grade steel, heat-treated for maximum tensile strength and fatigue resistance, which is critical for handling the extreme stresses of high horsepower applications, forced induction, or aggressive cam profiles. Their **fully machined surfaces** ensure a smooth, consistent fit with the crankshaft journals, minimizing wear and maximizing efficiency. The **rod caps** are secured with **high-strength bolts** (often ARP or equivalent), allowing for precise torque settings to prevent loosening under high RPM or heavy loads. The **big-end bearings** included in the kit are typically **two-piece, full-width shells** designed to handle the torque and heat generated by the 370 s robust displacement, further enhancing reliability in demanding conditions.

The **pistons** in this assembly are engineered with **forged aluminum construction**, offering an optimal balance of weight reduction and strength. They feature **dome-shaped tops** to accommodate high-lift camshafts and aggressive valve springs, ensuring proper combustion chamber geometry for peak performance. The **ring package** is carefully selected to match the intended application whether it s a **street/strip build, drag racing, or high-performance cruising** with options for **low-tension, medium-tension, or high-tension rings** to suit different oil viscosities and operating temperatures. Some versions may include **wrist pins** with **snap rings or circlips**, ensuring secure retention while allowing for smooth reciprocating motion. The **piston pin bosses** are reinforced for added durability, reducing the risk of fatigue failure under extreme stress.

This **H707P kit** is particularly well-suited for **Ford s 370 Cleveland engines** found in vehicles like the **Fairlane, Thunderbird, Mustang (1965 1966), and early Boss 302 models**, as well as aftermarket builds where stock components have been replaced or upgraded. The **D9TE-AA and AQ51 pistons** are known for their **compatibility with various cylinder head options**, including **cross-ram, high-rise, or aftermarket heads**, making them versatile for a wide range of modifications. Whether you're restoring a classic muscle car to its original glory or pushing a modernized 370 to new power levels, these rods and pistons provide the structural integrity and performance edge needed to handle the demands of modern driving without sacrificing reliability.

For optimal results, this kit is best installed by a **qualified machine shop or engine builder** with experience in **Ford big-block Cleveland engines**, as proper **decking, rod bearing clearance, and piston-to-wall clearance** are critical for long-term success. When combined with a **high-performance camshaft, upgraded valve train, and proper lubrication system**, the **Ford H707P 370 Big Block Connecting Rods and Pistons** will not only restore confidence in an aging engine but also unlock its full potential, delivering **smooth, responsive power** that turns heads and turns wrenches with equal enthusiasm.

### **Pros and Cons of Buying Ford H707P 370 Big Block Connecting Rods, Pistons (D9TE-AA, AQ51, 040)**

1. **High-Quality Materials** These components are designed for heavy-duty applications, often using forged steel or high-strength alloys to withstand extreme stress, making them ideal for high-performance or modified engines.

2. **Compatibility with Ford Big Block Engines** Specifically engineered for Ford s 370 cubic inch (6.1L) big block engines (common in muscle cars, trucks, and performance applications), ensuring proper fitment without modification.

3. **Durability and Longevity** Forged rods and pistons are less prone to warping or failure under high RPM, compression, or forced induction, extending engine life in demanding conditions.

4. **Performance Enhancements** Lighter forged pistons can improve engine response and power output, while reinforced rods help maintain structural integrity under high loads.

5. **Aftermarket Support** Widely available from reputable manufacturers, making it easier to find replacement parts, gaskets, or related components if needed.

6. **Proven Reliability** Many of these parts are used in racing and high-performance applications, suggesting they meet rigorous durability standards.

7. **Customization Options** Some versions (like the D9TE-AA or AQ51) may offer specific features such as oil control rings, different piston shapes (domed, flat, or dish), or rod bearing options to suit different tuning goals.

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1. **Cost** High-quality forged rods and pistons are significantly more expensive than cast alternatives, which can be a barrier for budget-conscious buyers.

2. **Installation Complexity** Requires professional installation or advanced mechanical skill, as improper fitting can lead to catastrophic engine failure. This may involve machining, gasket replacement, and precise assembly.

3. **Potential for Overkill** If the engine is not heavily modified or stressed, these components may be unnecessary, leading to wasted investment.

4. **Limited Stock Availability** Some variants (e.g., specific part numbers like 040) may be harder to find, requiring special ordering or longer lead times.

5. **Compatibility Risks** Even if the part numbers match, slight variations in crankshaft journals, rod lengths, or piston pin sizes could require additional machining or customization.

6. **Maintenance Requirements** Forged components demand proper lubrication, cooling, and regular inspections to prevent premature wear or failure.

7. **Resale Value** While durable, these parts may not retain high resale value compared to OEM or less specialized aftermarket options.

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The **Ford H707P 370 big block connecting rods and pistons (D9TE-AA, AQ51, 040)** are an excellent choice for **serious performance builds, high-RPM applications, or engines under forced induction**. They offer superior strength, longevity, and compatibility with Ford s 370 big block architecture. However, they come at a premium cost and require careful installation to avoid risks.

If your engine is **stock or lightly modified**, these parts may be overkill. But for **racing, street rod builds, or high-performance tuning**, they are a worthwhile investment for reliability and power potential.

- **Buy if:** You re building a **high-performance or race engine**, plan to run **forced induction (turbo/supercharger)**, or need **maximum durability** for extreme conditions.

- **Avoid if:** Your engine is **stock or lightly modified**, and you re on a tight budget, as standard aftermarket or OEM parts may suffice.

- **Consider alternatives:** If cost is a concern, explore **high-quality cast pistons** or **aftermarket rod sets** that offer a balance of performance and affordability.

- **Verify compatibility:** Double-check crankshaft dimensions, rod lengths, and piston pin sizes to ensure a perfect fit consult a mechanic or engine builder if unsure.

For most **serious Ford big block enthusiasts**, these parts are a **strong upgrade** worth the investment when used correctly.

Details:

Have two 4s and 6s but no 5 or 7. Comes to you exactly as shown so please look closely at all pictures tried show several angles and any major flaws. Rods and caps were paired together as removed numbers matched. Last 2 pictures are of remain tag and block casting numbers for reference.

Selling as parts or rebuild able units. Set of connecting rods and Pistons removed from a Ford 370 big block engine early 80s f700 truck. Engine appears to have been rebuilt at some point in its life and has a remanufactured tag. Rods appear to be in good condition, pistons will need restored some degree.

Vehicle was sitting for several years and engine stuck when I got to it. Was able to free up and remove pistons without causing any further damage. All were removed from the same engine although numbers don't appear to be in sequence.

part #: h707p prices

• $44.99-$150.00

specifications pistonrinro:

• for makes: Ford
• mpn: H707p
• type: Connecting Rod Set
• oe/oem part number: D9te-aa Aq51
• items included: 8 Rods, 8 Pistons

offer pistonrinro:

• quantity: 1
• started: March 8, 2026
• best offers: True
• sold: 0
• options: Ship-to-home
• availability: In Stock

seller pistonrinro:

• # reviews: 257
• city: Unity, Maine
• rating: 100.0%

general pistonrinro:

• condition: For parts or not working
• Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts

payments pistonrinro:

• other
• wallet: Paypal
• credit card: Visa

returns pistonrinro:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

shipping pistonrinro:

• carrier: FedEx
• class: Economy, Standard
• transit: 4-9 Days
• type: Calculated
• cost: $47.88
• service: FedEx Ground Economy, FedEx Ground / FedEx Home Delivery

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