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Shop Engine Top End Cylinder Heads for Flathead
Aluminum Cylinder Heads

Aluminum Cylinder Heads

Cylinder heads; fits 74” and 80” Flathead Big Twin 1936-1948; aluminum; nominal bore: 3-5/16 ” / 3-7/16 ”; compression: 5.5 : 1 (1200cc), 5.85 : 1 (1300cc); head bolt pattern: Flathead 9 bolt; plug threads: 1 x M18 x 1.5 x 12.7 mm; replaces OEM HD 16661-40, 16666-40, and 16667-40; gross weight: 6 kg
Cylinder heads; fits 74” and 80” Flathead Big Twin 1936-1948; aluminum; nominal bore: 3-5/16 ” / 3-7/16 ”; compression: 5.5 : 1 (1200cc), 5.85 : 1 (1300cc); head bolt pattern: Flathead 9 bolt; plug threads: 1 x M18 x 1.5 x 12.7 mm; replaces OEM HD 16661-40, 16666-40, and 16667-40; gross weight: 6 kg
Cylinder heads; fits 74” and 80” Flathead Big Twin 1936-1948; aluminum; nominal bore: 3-5/16 ” / 3-7/16 ”; compression: 5.5 : 1 (1200cc), 5.85 : 1 (1300cc); head bolt pattern: Flathead 9 bolt; plug threads: 1 x M18 x 1.5 x 12.7 mm; replaces OEM HD 16661-40, 16666-40, and 16667-40; gross weight: 6 kg
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Select subgroup:
for Big Twin Flathead
for Big Twin Flathead
for 45
for 45"/750cc Flathead
Price and stock:
Item №
62-400
Price incl. VAT
823.92 €
Available
6
Ready for immediate delivery from our Würzburg, Germany warehouse
The price includes 131.55 € German VAT.
pair
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Facts
Description
  • Cylinder heads
  • fits 74” and 80” Flathead Big Twin 1936-1948
  • aluminum
  • nominal bore: 3-5/16 ” / 3-7/16 ”
  • compression: 5.5 : 1 (1200cc), 5.85 : 1 (1300cc)
  • head bolt pattern: Flathead 9 bolt
  • plug threads: 1 x M18 x 1.5 x 12.7 mm
  • replaces Harley-Davidson part number HD 16661-40, 16666-40, and 16667-40
  • gross weight: 6 kg

Aluminium cylinder heads for Flatheads. Harley-Davidson decided to use aluminium cyclinder heads in 1940, as these have much better heat dissipation abilities than comparable cast-iron cylinders heads. Set of front and rear cylinder head.

Accessories:

55-393

55-393

Gasket by James Gaskets; for Cylinder head; fits V-models 1936, U-models 1936-1948; copper; replaces OEM HD 16769-36; gross weight: 35 g
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James Gasket Kits for Top End: Sidevalve Big Twin 1936-1948

James Gasket Kits for Top End: Sidevalve Big Twin 1936-1948

Include all gaskets for top end overhaul.
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Washers for Cylinder Head Bolts: SV Aluminum Heads

Washers for Cylinder Head Bolts: SV Aluminum Heads

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Cylinder Head Bolts Kits: Big Twin Flatheads with Aluminum Heads

Cylinder Head Bolts Kits: Big Twin Flatheads with Aluminum Heads

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See also:

VT-Cycle ULR Cylinder Heads

VT-Cycle ULR Cylinder Heads

A few more extra ponies for that old Big Flathead won’t hurt and you will get them fairly easy with a set of these ULR cylinder heads, made from cast aluminum. While looking quite original on the outside they feature an advanced combustion chamber design for improved combustion and breathing. Chamber volume is 100 cc, giving 6.1:1 compression on a 74” and 6.5:1 on an 80” motor. Substantially more material allows for custom milling and pop-up pistons. Another update are the 14mm sparkplug threads (3/4” long) for modern and more common plugs....
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