What does 'big bore' mean for my Harley-Davidson engine?

A 'big bore' modification means the engine's cylinders have been enlarged beyond their original factory size. This increases the engine's displacement, which generally leads to more power and torque. This piston is specifically made to fit those enlarged cylinders.

Why is a forged piston recommended for a big bore engine?

Forged pistons are made by shaping aluminum under extreme pressure, which aligns the metal's grain structure. This results in a much stronger and more durable piston compared to cast pistons, making it better suited to handle the increased stress and heat in a modified, larger displacement engine.

How many pistons do I need to order for my Harley-Davidson Twin Cam?

This listing is for a single piston. Your Harley-Davidson Twin Cam engine has multiple cylinders (typically two). You will need to order one piston for each cylinder you are replacing or rebuilding. Check your service manual for the exact number of cylinders in your engine.

JE Pistons Twin Cam Big Bore Piston Single 161933S

Name: JE Pistons Harley-Davidson Twin Cam Big Bore Piston Single
Brand: JE Pistons
SKU: je-pistons-je-pistons-harley-davidson-twin-cam-big-bore-piston-single-t14-695134
Price: 299.99 USD
Availability: BackOrder

JE Pistons Harley-Davidson Twin Cam Big Bore Piston Single

$299.99

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

JE Pistons Twin Cam Big Bore Piston Single. This single piston is built for performance Twin Cam Harley-Davidson engines.

Key Features

This listing is for a single forged piston.
Designed for Harley-Davidson Twin Cam engines with a big bore modification.
Forged construction offers improved strength and durability over cast pistons.
From JE Pistons, a well-known manufacturer of performance engine components.
Not CARB approved; cannot ship to California.

This piston is designed for Harley-Davidson Twin Cam engines that have undergone a big bore modification. Always confirm compatibility with your specific engine build and bore size.

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Product Details

This product is a single, forged piston designed for Harley-Davidson Twin Cam engines that have been 'big bored' to increase displacement. It's a well-built component from JE Pistons, a name known for performance engine parts. If you're rebuilding or upgrading the top end of your Twin Cam, this piston is a key piece to get your engine running with its new, larger bore.

Forged pistons like this one are stronger and more durable than cast pistons, making them a solid choice for engines that see demanding use or have been modified for increased power. The forging process aligns the metal's grain structure for improved strength, which is crucial when you're increasing the bore size and compression. This particular piston is designed to fit the specific bore size required for a Twin Cam big bore application, ensuring a proper seal and efficient combustion. Remember, this is a single piston, so you'll need to order the correct quantity for your engine's cylinders.

Please note that this piston is not CARB approved and cannot be shipped to California. Always refer to JE Pistons' official documentation for detailed installation instructions and specifications to ensure proper fitment and performance for your specific Twin Cam engine build.