Harddrive Cylinder - 80 Shovelhead Rear Cylinder — Harley-Davidson Electra Glide, Super Glide, Low Rider (1970-1984)

Harddrive cast iron rear cylinder for 80-cubic-inch Shovelhead engines, designed for stock replacement or big bore displacement increases. Sold individually and requires finish honing and piston matching before installation.

Features

• Cast iron construction
• Powder-coated black finish with machined fins
• Sold individually — pair with matching front cylinder
• Requires finish honing and piston matching (pistons sold separately)
• OEM-style appearance

Specifications

• Brand: Harddrive
• Manufacturer Part #: 34-006
• UPC: 191361166648
• Length: 8.7 in
• Width: 8.5 in
• Height: 8.5 in
• Weight: 12.56 lbs
• Country of Origin: China (Taiwan)

Fitment

Fits 80-cubic-inch Shovelhead V-twin engines. Must be paired with a matching front cylinder and new pistons for proper displacement and performance.

Frequently Asked Questions

Can I install this cylinder by itself?

No — cylinders must be purchased and installed as pairs (front and rear) and matched with new pistons for correct fit and compression.

Do I need to have this honed before installation?

Yes. Finish honing is required to match your chosen pistons and ensure proper ring seal and engine durability.

Are pistons included?

No — pistons are sold separately. You'll need to select pistons matched to your desired displacement and have them fit to this cylinder.

Is this suitable for a big bore build?

Yes — this cylinder is ideal for displacement increases on Shovelhead engines when paired with larger pistons and proper machine work.

What finish does it come in?

Powder-coated black with machined aluminum fins for an OEM appearance.