do not press the back button…
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
- Porsche 914 (1970-1976)
Cast Iron Big Bore Cylinder Kit – Set of 4
Take your Porsche 914 engine build to the next level with
this Cast Iron Big Bore Cylinder Kit, available in 103mm,
104mm or 105mm bore sizes for Volkswagen Type 4 engines fitted to
the Porsche 914.
Fits:
- Porsche 914 (1970-1976)
Manufactured from high-quality cast iron, these precision-machined cylinders are designed for serious performance engine builds where increased engine capacity and power are the primary objectives. The robust cast iron construction provides exceptional wear resistance and long-term durability, making them ideal for high-performance naturally aspirated or motorsport applications.
Please Note: This is a true big bore conversion and requires machining of both the crankcase and cylinder heads to accept the larger cylinder diameter. Professional engine building and machining are essential for correct installation.
Whether you're building a fast road engine or a competition-specification Type 4, this OE Match cylinder kit provides the strength and precision required for demanding applications.
What Do Engine Cylinders Do?
The engine cylinders form the bores in which the pistons travel, creating the compression required for combustion and power production.
Their primary functions include:
- Guiding piston movement
- Maintaining combustion chamber compression
- Providing a hard-wearing cylinder surface
- Dissipating combustion heat
- Supporting efficient and reliable engine operation
Accurate cylinder dimensions are critical to engine performance, oil control and longevity.
Why Do Engine Cylinders Wear Out?
Over time, the cylinder bores are subjected to continual piston movement, high temperatures and combustion pressures.
Common causes of wear include:
- High engine mileage
- Poor lubrication
- Engine overheating
- Worn piston rings
- Dirt or debris entering the engine
- Detonation or excessive engine loads
As cylinder wear increases, engine compression falls, oil consumption rises and overall performance deteriorates.
Why Upgrade to a Big Bore Cylinder Kit?
A big bore conversion is one of the most effective ways of increasing the displacement and performance potential of a Type 4 engine.
Benefits include:
- Increased engine capacity
- Higher torque throughout the rev range
- Greater horsepower potential
- Improved throttle response
- Ideal foundation for high-performance engine builds
- Strong cast iron construction for excellent durability
Available in 103mm, 104mm and 105mm bore sizes, these cylinders provide maximum flexibility for bespoke engine builds.
When Should They Be Replaced?
Replacement or upgrading is recommended if:
- Cylinder bores are worn, tapered or scored
- Compression readings are below specification
- Oil consumption has increased significantly
- The engine is being completely rebuilt
- A larger engine capacity is required
- Existing cylinders have suffered heat damage or corrosion
Installing a new cylinder kit during an engine rebuild restores engine integrity while providing the opportunity to significantly increase engine performance.
Porsche 914 Type 4 Performance Engine Components
For enthusiasts seeking maximum performance from the Type 4 engine, a big bore cylinder conversion offers substantial gains in engine capacity and power potential. Larger bore cylinders allow builders to create bespoke engine combinations capable of delivering significantly improved torque and horsepower when matched with the appropriate pistons, cylinder heads, camshaft and induction system.
These OE Match cast iron cylinders are engineered for strength, durability and precision, making them an excellent choice for demanding performance builds where reliability is just as important as outright power.
Benefits of the Cast Iron Big Bore Cylinder Kit
- Available in 103mm, 104mm and 105mm bore sizes
- Significantly increases engine displacement
- Improves torque and horsepower potential
- High-strength cast iron construction
- Excellent wear resistance
- Ideal for custom performance engine builds
- Precision engineered for professional installation